| /* |
| * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. |
| * Copyright 2012, 2014 SAP AG. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| // According to the AIX OS doc #pragma alloca must be used |
| // with C++ compiler before referencing the function alloca() |
| #pragma alloca |
| |
| // no precompiled headers |
| #include "classfile/classLoader.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "classfile/vmSymbols.hpp" |
| #include "code/icBuffer.hpp" |
| #include "code/vtableStubs.hpp" |
| #include "compiler/compileBroker.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "jvm_aix.h" |
| #include "libperfstat_aix.hpp" |
| #include "loadlib_aix.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "memory/filemap.hpp" |
| #include "mutex_aix.inline.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "os_aix.inline.hpp" |
| #include "os_share_aix.hpp" |
| #include "porting_aix.hpp" |
| #include "prims/jniFastGetField.hpp" |
| #include "prims/jvm.h" |
| #include "prims/jvm_misc.hpp" |
| #include "runtime/arguments.hpp" |
| #include "runtime/atomic.inline.hpp" |
| #include "runtime/extendedPC.hpp" |
| #include "runtime/globals.hpp" |
| #include "runtime/interfaceSupport.hpp" |
| #include "runtime/java.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/mutexLocker.hpp" |
| #include "runtime/objectMonitor.hpp" |
| #include "runtime/orderAccess.inline.hpp" |
| #include "runtime/osThread.hpp" |
| #include "runtime/perfMemory.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "runtime/statSampler.hpp" |
| #include "runtime/stubRoutines.hpp" |
| #include "runtime/thread.inline.hpp" |
| #include "runtime/threadCritical.hpp" |
| #include "runtime/timer.hpp" |
| #include "runtime/vm_version.hpp" |
| #include "services/attachListener.hpp" |
| #include "services/runtimeService.hpp" |
| #include "utilities/decoder.hpp" |
| #include "utilities/defaultStream.hpp" |
| #include "utilities/events.hpp" |
| #include "utilities/growableArray.hpp" |
| #include "utilities/vmError.hpp" |
| |
| // put OS-includes here (sorted alphabetically) |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <poll.h> |
| #include <procinfo.h> |
| #include <pthread.h> |
| #include <pwd.h> |
| #include <semaphore.h> |
| #include <signal.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <sys/ioctl.h> |
| #include <sys/ipc.h> |
| #include <sys/mman.h> |
| #include <sys/resource.h> |
| #include <sys/select.h> |
| #include <sys/shm.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/sysinfo.h> |
| #include <sys/systemcfg.h> |
| #include <sys/time.h> |
| #include <sys/times.h> |
| #include <sys/types.h> |
| #include <sys/utsname.h> |
| #include <sys/vminfo.h> |
| #include <sys/wait.h> |
| |
| // Add missing declarations (should be in procinfo.h but isn't until AIX 6.1). |
| #if !defined(_AIXVERSION_610) |
| extern "C" { |
| int getthrds64(pid_t ProcessIdentifier, |
| struct thrdentry64* ThreadBuffer, |
| int ThreadSize, |
| tid64_t* IndexPointer, |
| int Count); |
| } |
| #endif |
| |
| // Excerpts from systemcfg.h definitions newer than AIX 5.3 |
| #ifndef PV_7 |
| # define PV_7 0x200000 // Power PC 7 |
| # define PV_7_Compat 0x208000 // Power PC 7 |
| #endif |
| |
| #define MAX_PATH (2 * K) |
| |
| // for timer info max values which include all bits |
| #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) |
| // for multipage initialization error analysis (in 'g_multipage_error') |
| #define ERROR_MP_OS_TOO_OLD 100 |
| #define ERROR_MP_EXTSHM_ACTIVE 101 |
| #define ERROR_MP_VMGETINFO_FAILED 102 |
| #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103 |
| |
| // the semantics in this file are thus that codeptr_t is a *real code ptr* |
| // This means that any function taking codeptr_t as arguments will assume |
| // a real codeptr and won't handle function descriptors (eg getFuncName), |
| // whereas functions taking address as args will deal with function |
| // descriptors (eg os::dll_address_to_library_name) |
| typedef unsigned int* codeptr_t; |
| |
| // typedefs for stackslots, stack pointers, pointers to op codes |
| typedef unsigned long stackslot_t; |
| typedef stackslot_t* stackptr_t; |
| |
| // query dimensions of the stack of the calling thread |
| static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size); |
| |
| // function to check a given stack pointer against given stack limits |
| inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) { |
| if (((uintptr_t)sp) & 0x7) { |
| return false; |
| } |
| if (sp > stack_base) { |
| return false; |
| } |
| if (sp < (stackptr_t) ((address)stack_base - stack_size)) { |
| return false; |
| } |
| return true; |
| } |
| |
| // returns true if function is a valid codepointer |
| inline bool is_valid_codepointer(codeptr_t p) { |
| if (!p) { |
| return false; |
| } |
| if (((uintptr_t)p) & 0x3) { |
| return false; |
| } |
| if (LoadedLibraries::find_for_text_address((address)p) == NULL) { |
| return false; |
| } |
| return true; |
| } |
| |
| // macro to check a given stack pointer against given stack limits and to die if test fails |
| #define CHECK_STACK_PTR(sp, stack_base, stack_size) { \ |
| guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \ |
| } |
| |
| // macro to check the current stack pointer against given stacklimits |
| #define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \ |
| address sp; \ |
| sp = os::current_stack_pointer(); \ |
| CHECK_STACK_PTR(sp, stack_base, stack_size); \ |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // global variables (for a description see os_aix.hpp) |
| |
| julong os::Aix::_physical_memory = 0; |
| pthread_t os::Aix::_main_thread = ((pthread_t)0); |
| int os::Aix::_page_size = -1; |
| int os::Aix::_on_pase = -1; |
| int os::Aix::_os_version = -1; |
| int os::Aix::_stack_page_size = -1; |
| size_t os::Aix::_shm_default_page_size = -1; |
| int os::Aix::_can_use_64K_pages = -1; |
| int os::Aix::_can_use_16M_pages = -1; |
| int os::Aix::_xpg_sus_mode = -1; |
| int os::Aix::_extshm = -1; |
| int os::Aix::_logical_cpus = -1; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // local variables |
| |
| static int g_multipage_error = -1; // error analysis for multipage initialization |
| static jlong initial_time_count = 0; |
| static int clock_tics_per_sec = 100; |
| static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks) |
| static bool check_signals = true; |
| static pid_t _initial_pid = 0; |
| static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769) |
| static sigset_t SR_sigset; |
| static pthread_mutex_t dl_mutex; // Used to protect dlsym() calls */ |
| |
| julong os::available_memory() { |
| return Aix::available_memory(); |
| } |
| |
| julong os::Aix::available_memory() { |
| os::Aix::meminfo_t mi; |
| if (os::Aix::get_meminfo(&mi)) { |
| return mi.real_free; |
| } else { |
| return 0xFFFFFFFFFFFFFFFFLL; |
| } |
| } |
| |
| julong os::physical_memory() { |
| return Aix::physical_memory(); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // environment support |
| |
| bool os::getenv(const char* name, char* buf, int len) { |
| const char* val = ::getenv(name); |
| if (val != NULL && strlen(val) < (size_t)len) { |
| strcpy(buf, val); |
| return true; |
| } |
| if (len > 0) buf[0] = 0; // return a null string |
| return false; |
| } |
| |
| |
| // Return true if user is running as root. |
| |
| bool os::have_special_privileges() { |
| static bool init = false; |
| static bool privileges = false; |
| if (!init) { |
| privileges = (getuid() != geteuid()) || (getgid() != getegid()); |
| init = true; |
| } |
| return privileges; |
| } |
| |
| // Helper function, emulates disclaim64 using multiple 32bit disclaims |
| // because we cannot use disclaim64() on AS/400 and old AIX releases. |
| static bool my_disclaim64(char* addr, size_t size) { |
| |
| if (size == 0) { |
| return true; |
| } |
| |
| // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.) |
| const unsigned int maxDisclaimSize = 0x80000000; |
| |
| const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize); |
| const unsigned int lastDisclaimSize = (size % maxDisclaimSize); |
| |
| char* p = addr; |
| |
| for (int i = 0; i < numFullDisclaimsNeeded; i ++) { |
| if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) { |
| //if (Verbose) |
| fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno); |
| return false; |
| } |
| p += maxDisclaimSize; |
| } |
| |
| if (lastDisclaimSize > 0) { |
| if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) { |
| //if (Verbose) |
| fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno); |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| // Cpu architecture string |
| #if defined(PPC32) |
| static char cpu_arch[] = "ppc"; |
| #elif defined(PPC64) |
| static char cpu_arch[] = "ppc64"; |
| #else |
| #error Add appropriate cpu_arch setting |
| #endif |
| |
| |
| // Given an address, returns the size of the page backing that address. |
| size_t os::Aix::query_pagesize(void* addr) { |
| |
| vm_page_info pi; |
| pi.addr = (uint64_t)addr; |
| if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) { |
| return pi.pagesize; |
| } else { |
| fprintf(stderr, "vmgetinfo failed to retrieve page size for address %p (errno %d).\n", addr, errno); |
| assert(false, "vmgetinfo failed to retrieve page size"); |
| return SIZE_4K; |
| } |
| |
| } |
| |
| // Returns the kernel thread id of the currently running thread. |
| pid_t os::Aix::gettid() { |
| return (pid_t) thread_self(); |
| } |
| |
| void os::Aix::initialize_system_info() { |
| |
| // get the number of online(logical) cpus instead of configured |
| os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN); |
| assert(_processor_count > 0, "_processor_count must be > 0"); |
| |
| // retrieve total physical storage |
| os::Aix::meminfo_t mi; |
| if (!os::Aix::get_meminfo(&mi)) { |
| fprintf(stderr, "os::Aix::get_meminfo failed.\n"); fflush(stderr); |
| assert(false, "os::Aix::get_meminfo failed."); |
| } |
| _physical_memory = (julong) mi.real_total; |
| } |
| |
| // Helper function for tracing page sizes. |
| static const char* describe_pagesize(size_t pagesize) { |
| switch (pagesize) { |
| case SIZE_4K : return "4K"; |
| case SIZE_64K: return "64K"; |
| case SIZE_16M: return "16M"; |
| case SIZE_16G: return "16G"; |
| default: |
| assert(false, "surprise"); |
| return "??"; |
| } |
| } |
| |
| // Retrieve information about multipage size support. Will initialize |
| // Aix::_page_size, Aix::_stack_page_size, Aix::_can_use_64K_pages, |
| // Aix::_can_use_16M_pages. |
| // Must be called before calling os::large_page_init(). |
| void os::Aix::query_multipage_support() { |
| |
| guarantee(_page_size == -1 && |
| _stack_page_size == -1 && |
| _can_use_64K_pages == -1 && |
| _can_use_16M_pages == -1 && |
| g_multipage_error == -1, |
| "do not call twice"); |
| |
| _page_size = ::sysconf(_SC_PAGESIZE); |
| |
| // This really would surprise me. |
| assert(_page_size == SIZE_4K, "surprise!"); |
| |
| |
| // Query default data page size (default page size for C-Heap, pthread stacks and .bss). |
| // Default data page size is influenced either by linker options (-bdatapsize) |
| // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given, |
| // default should be 4K. |
| size_t data_page_size = SIZE_4K; |
| { |
| void* p = ::malloc(SIZE_16M); |
| guarantee(p != NULL, "malloc failed"); |
| data_page_size = os::Aix::query_pagesize(p); |
| ::free(p); |
| } |
| |
| // query default shm page size (LDR_CNTRL SHMPSIZE) |
| { |
| const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR); |
| guarantee(shmid != -1, "shmget failed"); |
| void* p = ::shmat(shmid, NULL, 0); |
| ::shmctl(shmid, IPC_RMID, NULL); |
| guarantee(p != (void*) -1, "shmat failed"); |
| _shm_default_page_size = os::Aix::query_pagesize(p); |
| ::shmdt(p); |
| } |
| |
| // before querying the stack page size, make sure we are not running as primordial |
| // thread (because primordial thread's stack may have different page size than |
| // pthread thread stacks). Running a VM on the primordial thread won't work for a |
| // number of reasons so we may just as well guarantee it here |
| guarantee(!os::Aix::is_primordial_thread(), "Must not be called for primordial thread"); |
| |
| // query stack page size |
| { |
| int dummy = 0; |
| _stack_page_size = os::Aix::query_pagesize(&dummy); |
| // everything else would surprise me and should be looked into |
| guarantee(_stack_page_size == SIZE_4K || _stack_page_size == SIZE_64K, "Wrong page size"); |
| // also, just for completeness: pthread stacks are allocated from C heap, so |
| // stack page size should be the same as data page size |
| guarantee(_stack_page_size == data_page_size, "stack page size should be the same as data page size"); |
| } |
| |
| // EXTSHM is bad: among other things, it prevents setting pagesize dynamically |
| // for system V shm. |
| if (Aix::extshm()) { |
| if (Verbose) { |
| fprintf(stderr, "EXTSHM is active - will disable large page support.\n" |
| "Please make sure EXTSHM is OFF for large page support.\n"); |
| } |
| g_multipage_error = ERROR_MP_EXTSHM_ACTIVE; |
| _can_use_64K_pages = _can_use_16M_pages = 0; |
| goto query_multipage_support_end; |
| } |
| |
| // now check which page sizes the OS claims it supports, and of those, which actually can be used. |
| { |
| const int MAX_PAGE_SIZES = 4; |
| psize_t sizes[MAX_PAGE_SIZES]; |
| const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES); |
| if (num_psizes == -1) { |
| if (Verbose) { |
| fprintf(stderr, "vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)\n", errno); |
| fprintf(stderr, "disabling multipage support.\n"); |
| } |
| g_multipage_error = ERROR_MP_VMGETINFO_FAILED; |
| _can_use_64K_pages = _can_use_16M_pages = 0; |
| goto query_multipage_support_end; |
| } |
| guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed."); |
| assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?"); |
| if (Verbose) { |
| fprintf(stderr, "vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes); |
| for (int i = 0; i < num_psizes; i ++) { |
| fprintf(stderr, " %s ", describe_pagesize(sizes[i])); |
| } |
| fprintf(stderr, " .\n"); |
| } |
| |
| // Can we use 64K, 16M pages? |
| _can_use_64K_pages = 0; |
| _can_use_16M_pages = 0; |
| for (int i = 0; i < num_psizes; i ++) { |
| if (sizes[i] == SIZE_64K) { |
| _can_use_64K_pages = 1; |
| } else if (sizes[i] == SIZE_16M) { |
| _can_use_16M_pages = 1; |
| } |
| } |
| |
| if (!_can_use_64K_pages) { |
| g_multipage_error = ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K; |
| } |
| |
| // Double-check for 16M pages: Even if AIX claims to be able to use 16M pages, |
| // there must be an actual 16M page pool, and we must run with enough rights. |
| if (_can_use_16M_pages) { |
| const int shmid = ::shmget(IPC_PRIVATE, SIZE_16M, IPC_CREAT | S_IRUSR | S_IWUSR); |
| guarantee(shmid != -1, "shmget failed"); |
| struct shmid_ds shm_buf = { 0 }; |
| shm_buf.shm_pagesize = SIZE_16M; |
| const bool can_set_pagesize = ::shmctl(shmid, SHM_PAGESIZE, &shm_buf) == 0 ? true : false; |
| const int en = errno; |
| ::shmctl(shmid, IPC_RMID, NULL); |
| if (!can_set_pagesize) { |
| if (Verbose) { |
| fprintf(stderr, "Failed to allocate even one misely 16M page. shmctl failed with %d (%s).\n" |
| "Will deactivate 16M support.\n", en, strerror(en)); |
| } |
| _can_use_16M_pages = 0; |
| } |
| } |
| |
| } // end: check which pages can be used for shared memory |
| |
| query_multipage_support_end: |
| |
| guarantee(_page_size != -1 && |
| _stack_page_size != -1 && |
| _can_use_64K_pages != -1 && |
| _can_use_16M_pages != -1, "Page sizes not properly initialized"); |
| |
| if (_can_use_64K_pages) { |
| g_multipage_error = 0; |
| } |
| |
| if (Verbose) { |
| fprintf(stderr, "Data page size (C-Heap, bss, etc): %s\n", describe_pagesize(data_page_size)); |
| fprintf(stderr, "Thread stack page size (pthread): %s\n", describe_pagesize(_stack_page_size)); |
| fprintf(stderr, "Default shared memory page size: %s\n", describe_pagesize(_shm_default_page_size)); |
| fprintf(stderr, "Can use 64K pages dynamically with shared meory: %s\n", (_can_use_64K_pages ? "yes" :"no")); |
| fprintf(stderr, "Can use 16M pages dynamically with shared memory: %s\n", (_can_use_16M_pages ? "yes" :"no")); |
| fprintf(stderr, "Multipage error details: %d\n", g_multipage_error); |
| } |
| |
| } // end os::Aix::query_multipage_support() |
| |
| // The code for this method was initially derived from the version in os_linux.cpp. |
| void os::init_system_properties_values() { |
| |
| #define DEFAULT_LIBPATH "/usr/lib:/lib" |
| #define EXTENSIONS_DIR "/lib/ext" |
| #define ENDORSED_DIR "/lib/endorsed" |
| |
| // Buffer that fits several sprintfs. |
| // Note that the space for the trailing null is provided |
| // by the nulls included by the sizeof operator. |
| const size_t bufsize = |
| MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. |
| (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR), // extensions dir |
| (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir |
| char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
| |
| // sysclasspath, java_home, dll_dir |
| { |
| char *pslash; |
| os::jvm_path(buf, bufsize); |
| |
| // Found the full path to libjvm.so. |
| // Now cut the path to <java_home>/jre if we can. |
| *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. |
| pslash = strrchr(buf, '/'); |
| if (pslash != NULL) { |
| *pslash = '\0'; // Get rid of /{client|server|hotspot}. |
| } |
| Arguments::set_dll_dir(buf); |
| |
| if (pslash != NULL) { |
| pslash = strrchr(buf, '/'); |
| if (pslash != NULL) { |
| *pslash = '\0'; // Get rid of /<arch>. |
| pslash = strrchr(buf, '/'); |
| if (pslash != NULL) { |
| *pslash = '\0'; // Get rid of /lib. |
| } |
| } |
| } |
| Arguments::set_java_home(buf); |
| set_boot_path('/', ':'); |
| } |
| |
| // Where to look for native libraries. |
| |
| // On Aix we get the user setting of LIBPATH. |
| // Eventually, all the library path setting will be done here. |
| // Get the user setting of LIBPATH. |
| const char *v = ::getenv("LIBPATH"); |
| const char *v_colon = ":"; |
| if (v == NULL) { v = ""; v_colon = ""; } |
| |
| // Concatenate user and invariant part of ld_library_path. |
| // That's +1 for the colon and +1 for the trailing '\0'. |
| char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal); |
| sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon); |
| Arguments::set_library_path(ld_library_path); |
| FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal); |
| |
| // Extensions directories. |
| sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home()); |
| Arguments::set_ext_dirs(buf); |
| |
| // Endorsed standards default directory. |
| sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); |
| Arguments::set_endorsed_dirs(buf); |
| |
| FREE_C_HEAP_ARRAY(char, buf, mtInternal); |
| |
| #undef DEFAULT_LIBPATH |
| #undef EXTENSIONS_DIR |
| #undef ENDORSED_DIR |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // breakpoint support |
| |
| void os::breakpoint() { |
| BREAKPOINT; |
| } |
| |
| extern "C" void breakpoint() { |
| // use debugger to set breakpoint here |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // signal support |
| |
| debug_only(static bool signal_sets_initialized = false); |
| static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; |
| |
| bool os::Aix::is_sig_ignored(int sig) { |
| struct sigaction oact; |
| sigaction(sig, (struct sigaction*)NULL, &oact); |
| void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) |
| : CAST_FROM_FN_PTR(void*, oact.sa_handler); |
| if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) |
| return true; |
| else |
| return false; |
| } |
| |
| void os::Aix::signal_sets_init() { |
| // Should also have an assertion stating we are still single-threaded. |
| assert(!signal_sets_initialized, "Already initialized"); |
| // Fill in signals that are necessarily unblocked for all threads in |
| // the VM. Currently, we unblock the following signals: |
| // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden |
| // by -Xrs (=ReduceSignalUsage)); |
| // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all |
| // other threads. The "ReduceSignalUsage" boolean tells us not to alter |
| // the dispositions or masks wrt these signals. |
| // Programs embedding the VM that want to use the above signals for their |
| // own purposes must, at this time, use the "-Xrs" option to prevent |
| // interference with shutdown hooks and BREAK_SIGNAL thread dumping. |
| // (See bug 4345157, and other related bugs). |
| // In reality, though, unblocking these signals is really a nop, since |
| // these signals are not blocked by default. |
| sigemptyset(&unblocked_sigs); |
| sigemptyset(&allowdebug_blocked_sigs); |
| sigaddset(&unblocked_sigs, SIGILL); |
| sigaddset(&unblocked_sigs, SIGSEGV); |
| sigaddset(&unblocked_sigs, SIGBUS); |
| sigaddset(&unblocked_sigs, SIGFPE); |
| sigaddset(&unblocked_sigs, SIGTRAP); |
| sigaddset(&unblocked_sigs, SIGDANGER); |
| sigaddset(&unblocked_sigs, SR_signum); |
| |
| if (!ReduceSignalUsage) { |
| if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { |
| sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); |
| sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); |
| } |
| if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { |
| sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); |
| sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); |
| } |
| if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { |
| sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); |
| sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); |
| } |
| } |
| // Fill in signals that are blocked by all but the VM thread. |
| sigemptyset(&vm_sigs); |
| if (!ReduceSignalUsage) |
| sigaddset(&vm_sigs, BREAK_SIGNAL); |
| debug_only(signal_sets_initialized = true); |
| } |
| |
| // These are signals that are unblocked while a thread is running Java. |
| // (For some reason, they get blocked by default.) |
| sigset_t* os::Aix::unblocked_signals() { |
| assert(signal_sets_initialized, "Not initialized"); |
| return &unblocked_sigs; |
| } |
| |
| // These are the signals that are blocked while a (non-VM) thread is |
| // running Java. Only the VM thread handles these signals. |
| sigset_t* os::Aix::vm_signals() { |
| assert(signal_sets_initialized, "Not initialized"); |
| return &vm_sigs; |
| } |
| |
| // These are signals that are blocked during cond_wait to allow debugger in |
| sigset_t* os::Aix::allowdebug_blocked_signals() { |
| assert(signal_sets_initialized, "Not initialized"); |
| return &allowdebug_blocked_sigs; |
| } |
| |
| void os::Aix::hotspot_sigmask(Thread* thread) { |
| |
| //Save caller's signal mask before setting VM signal mask |
| sigset_t caller_sigmask; |
| pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); |
| |
| OSThread* osthread = thread->osthread(); |
| osthread->set_caller_sigmask(caller_sigmask); |
| |
| pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL); |
| |
| if (!ReduceSignalUsage) { |
| if (thread->is_VM_thread()) { |
| // Only the VM thread handles BREAK_SIGNAL ... |
| pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); |
| } else { |
| // ... all other threads block BREAK_SIGNAL |
| pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); |
| } |
| } |
| } |
| |
| // retrieve memory information. |
| // Returns false if something went wrong; |
| // content of pmi undefined in this case. |
| bool os::Aix::get_meminfo(meminfo_t* pmi) { |
| |
| assert(pmi, "get_meminfo: invalid parameter"); |
| |
| memset(pmi, 0, sizeof(meminfo_t)); |
| |
| if (os::Aix::on_pase()) { |
| |
| Unimplemented(); |
| return false; |
| |
| } else { |
| |
| // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics |
| // See: |
| // http://publib.boulder.ibm.com/infocenter/systems/index.jsp |
| // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm |
| // http://publib.boulder.ibm.com/infocenter/systems/index.jsp |
| // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm |
| |
| perfstat_memory_total_t psmt; |
| memset (&psmt, '\0', sizeof(psmt)); |
| const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1); |
| if (rc == -1) { |
| fprintf(stderr, "perfstat_memory_total() failed (errno=%d)\n", errno); |
| assert(0, "perfstat_memory_total() failed"); |
| return false; |
| } |
| |
| assert(rc == 1, "perfstat_memory_total() - weird return code"); |
| |
| // excerpt from |
| // http://publib.boulder.ibm.com/infocenter/systems/index.jsp |
| // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm |
| // The fields of perfstat_memory_total_t: |
| // u_longlong_t virt_total Total virtual memory (in 4 KB pages). |
| // u_longlong_t real_total Total real memory (in 4 KB pages). |
| // u_longlong_t real_free Free real memory (in 4 KB pages). |
| // u_longlong_t pgsp_total Total paging space (in 4 KB pages). |
| // u_longlong_t pgsp_free Free paging space (in 4 KB pages). |
| |
| pmi->virt_total = psmt.virt_total * 4096; |
| pmi->real_total = psmt.real_total * 4096; |
| pmi->real_free = psmt.real_free * 4096; |
| pmi->pgsp_total = psmt.pgsp_total * 4096; |
| pmi->pgsp_free = psmt.pgsp_free * 4096; |
| |
| return true; |
| |
| } |
| } // end os::Aix::get_meminfo |
| |
| // Retrieve global cpu information. |
| // Returns false if something went wrong; |
| // the content of pci is undefined in this case. |
| bool os::Aix::get_cpuinfo(cpuinfo_t* pci) { |
| assert(pci, "get_cpuinfo: invalid parameter"); |
| memset(pci, 0, sizeof(cpuinfo_t)); |
| |
| perfstat_cpu_total_t psct; |
| memset (&psct, '\0', sizeof(psct)); |
| |
| if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t), 1)) { |
| fprintf(stderr, "perfstat_cpu_total() failed (errno=%d)\n", errno); |
| assert(0, "perfstat_cpu_total() failed"); |
| return false; |
| } |
| |
| // global cpu information |
| strcpy (pci->description, psct.description); |
| pci->processorHZ = psct.processorHZ; |
| pci->ncpus = psct.ncpus; |
| os::Aix::_logical_cpus = psct.ncpus; |
| for (int i = 0; i < 3; i++) { |
| pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS); |
| } |
| |
| // get the processor version from _system_configuration |
| switch (_system_configuration.version) { |
| case PV_7: |
| strcpy(pci->version, "Power PC 7"); |
| break; |
| case PV_6_1: |
| strcpy(pci->version, "Power PC 6 DD1.x"); |
| break; |
| case PV_6: |
| strcpy(pci->version, "Power PC 6"); |
| break; |
| case PV_5: |
| strcpy(pci->version, "Power PC 5"); |
| break; |
| case PV_5_2: |
| strcpy(pci->version, "Power PC 5_2"); |
| break; |
| case PV_5_3: |
| strcpy(pci->version, "Power PC 5_3"); |
| break; |
| case PV_5_Compat: |
| strcpy(pci->version, "PV_5_Compat"); |
| break; |
| case PV_6_Compat: |
| strcpy(pci->version, "PV_6_Compat"); |
| break; |
| case PV_7_Compat: |
| strcpy(pci->version, "PV_7_Compat"); |
| break; |
| default: |
| strcpy(pci->version, "unknown"); |
| } |
| |
| return true; |
| |
| } //end os::Aix::get_cpuinfo |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // detecting pthread library |
| |
| void os::Aix::libpthread_init() { |
| return; |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // create new thread |
| |
| // Thread start routine for all newly created threads |
| static void *java_start(Thread *thread) { |
| |
| // find out my own stack dimensions |
| { |
| // actually, this should do exactly the same as thread->record_stack_base_and_size... |
| address base = 0; |
| size_t size = 0; |
| query_stack_dimensions(&base, &size); |
| thread->set_stack_base(base); |
| thread->set_stack_size(size); |
| } |
| |
| // Do some sanity checks. |
| CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size()); |
| |
| // Try to randomize the cache line index of hot stack frames. |
| // This helps when threads of the same stack traces evict each other's |
| // cache lines. The threads can be either from the same JVM instance, or |
| // from different JVM instances. The benefit is especially true for |
| // processors with hyperthreading technology. |
| |
| static int counter = 0; |
| int pid = os::current_process_id(); |
| alloca(((pid ^ counter++) & 7) * 128); |
| |
| ThreadLocalStorage::set_thread(thread); |
| |
| OSThread* osthread = thread->osthread(); |
| |
| // thread_id is kernel thread id (similar to Solaris LWP id) |
| osthread->set_thread_id(os::Aix::gettid()); |
| |
| // initialize signal mask for this thread |
| os::Aix::hotspot_sigmask(thread); |
| |
| // initialize floating point control register |
| os::Aix::init_thread_fpu_state(); |
| |
| assert(osthread->get_state() == RUNNABLE, "invalid os thread state"); |
| |
| // call one more level start routine |
| thread->run(); |
| |
| return 0; |
| } |
| |
| bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { |
| |
| // We want the whole function to be synchronized. |
| ThreadCritical cs; |
| |
| assert(thread->osthread() == NULL, "caller responsible"); |
| |
| // Allocate the OSThread object |
| OSThread* osthread = new OSThread(NULL, NULL); |
| if (osthread == NULL) { |
| return false; |
| } |
| |
| // set the correct thread state |
| osthread->set_thread_type(thr_type); |
| |
| // Initial state is ALLOCATED but not INITIALIZED |
| osthread->set_state(ALLOCATED); |
| |
| thread->set_osthread(osthread); |
| |
| // init thread attributes |
| pthread_attr_t attr; |
| pthread_attr_init(&attr); |
| guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???"); |
| |
| // Make sure we run in 1:1 kernel-user-thread mode. |
| if (os::Aix::on_aix()) { |
| guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???"); |
| guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???"); |
| } // end: aix |
| |
| // Start in suspended state, and in os::thread_start, wake the thread up. |
| guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???"); |
| |
| // calculate stack size if it's not specified by caller |
| if (os::Aix::supports_variable_stack_size()) { |
| if (stack_size == 0) { |
| stack_size = os::Aix::default_stack_size(thr_type); |
| |
| switch (thr_type) { |
| case os::java_thread: |
| // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss. |
| assert(JavaThread::stack_size_at_create() > 0, "this should be set"); |
| stack_size = JavaThread::stack_size_at_create(); |
| break; |
| case os::compiler_thread: |
| if (CompilerThreadStackSize > 0) { |
| stack_size = (size_t)(CompilerThreadStackSize * K); |
| break; |
| } // else fall through: |
| // use VMThreadStackSize if CompilerThreadStackSize is not defined |
| case os::vm_thread: |
| case os::pgc_thread: |
| case os::cgc_thread: |
| case os::watcher_thread: |
| if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); |
| break; |
| } |
| } |
| |
| stack_size = MAX2(stack_size, os::Aix::min_stack_allowed); |
| pthread_attr_setstacksize(&attr, stack_size); |
| } //else let thread_create() pick the default value (96 K on AIX) |
| |
| pthread_t tid; |
| int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); |
| |
| pthread_attr_destroy(&attr); |
| |
| if (ret != 0) { |
| if (PrintMiscellaneous && (Verbose || WizardMode)) { |
| perror("pthread_create()"); |
| } |
| // Need to clean up stuff we've allocated so far |
| thread->set_osthread(NULL); |
| delete osthread; |
| return false; |
| } |
| |
| // Store pthread info into the OSThread |
| osthread->set_pthread_id(tid); |
| |
| return true; |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| // attach existing thread |
| |
| // bootstrap the main thread |
| bool os::create_main_thread(JavaThread* thread) { |
| assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread"); |
| return create_attached_thread(thread); |
| } |
| |
| bool os::create_attached_thread(JavaThread* thread) { |
| #ifdef ASSERT |
| thread->verify_not_published(); |
| #endif |
| |
| // Allocate the OSThread object |
| OSThread* osthread = new OSThread(NULL, NULL); |
| |
| if (osthread == NULL) { |
| return false; |
| } |
| |
| // Store pthread info into the OSThread |
| osthread->set_thread_id(os::Aix::gettid()); |
| osthread->set_pthread_id(::pthread_self()); |
| |
| // initialize floating point control register |
| os::Aix::init_thread_fpu_state(); |
| |
| // some sanity checks |
| CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size()); |
| |
| // Initial thread state is RUNNABLE |
| osthread->set_state(RUNNABLE); |
| |
| thread->set_osthread(osthread); |
| |
| if (UseNUMA) { |
| int lgrp_id = os::numa_get_group_id(); |
| if (lgrp_id != -1) { |
| thread->set_lgrp_id(lgrp_id); |
| } |
| } |
| |
| // initialize signal mask for this thread |
| // and save the caller's signal mask |
| os::Aix::hotspot_sigmask(thread); |
| |
| return true; |
| } |
| |
| void os::pd_start_thread(Thread* thread) { |
| int status = pthread_continue_np(thread->osthread()->pthread_id()); |
| assert(status == 0, "thr_continue failed"); |
| } |
| |
| // Free OS resources related to the OSThread |
| void os::free_thread(OSThread* osthread) { |
| assert(osthread != NULL, "osthread not set"); |
| |
| if (Thread::current()->osthread() == osthread) { |
| // Restore caller's signal mask |
| sigset_t sigmask = osthread->caller_sigmask(); |
| pthread_sigmask(SIG_SETMASK, &sigmask, NULL); |
| } |
| |
| delete osthread; |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // thread local storage |
| |
| int os::allocate_thread_local_storage() { |
| pthread_key_t key; |
| int rslt = pthread_key_create(&key, NULL); |
| assert(rslt == 0, "cannot allocate thread local storage"); |
| return (int)key; |
| } |
| |
| // Note: This is currently not used by VM, as we don't destroy TLS key |
| // on VM exit. |
| void os::free_thread_local_storage(int index) { |
| int rslt = pthread_key_delete((pthread_key_t)index); |
| assert(rslt == 0, "invalid index"); |
| } |
| |
| void os::thread_local_storage_at_put(int index, void* value) { |
| int rslt = pthread_setspecific((pthread_key_t)index, value); |
| assert(rslt == 0, "pthread_setspecific failed"); |
| } |
| |
| extern "C" Thread* get_thread() { |
| return ThreadLocalStorage::thread(); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // time support |
| |
| // Time since start-up in seconds to a fine granularity. |
| // Used by VMSelfDestructTimer and the MemProfiler. |
| double os::elapsedTime() { |
| return (double)(os::elapsed_counter()) * 0.000001; |
| } |
| |
| jlong os::elapsed_counter() { |
| timeval time; |
| int status = gettimeofday(&time, NULL); |
| return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; |
| } |
| |
| jlong os::elapsed_frequency() { |
| return (1000 * 1000); |
| } |
| |
| // For now, we say that linux does not support vtime. I have no idea |
| // whether it can actually be made to (DLD, 9/13/05). |
| |
| bool os::supports_vtime() { return false; } |
| bool os::enable_vtime() { return false; } |
| bool os::vtime_enabled() { return false; } |
| double os::elapsedVTime() { |
| // better than nothing, but not much |
| return elapsedTime(); |
| } |
| |
| jlong os::javaTimeMillis() { |
| timeval time; |
| int status = gettimeofday(&time, NULL); |
| assert(status != -1, "aix error at gettimeofday()"); |
| return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); |
| } |
| |
| // We need to manually declare mread_real_time, |
| // because IBM didn't provide a prototype in time.h. |
| // (they probably only ever tested in C, not C++) |
| extern "C" |
| int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t); |
| |
| jlong os::javaTimeNanos() { |
| if (os::Aix::on_pase()) { |
| Unimplemented(); |
| return 0; |
| } |
| else { |
| // On AIX use the precision of processors real time clock |
| // or time base registers. |
| timebasestruct_t time; |
| int rc; |
| |
| // If the CPU has a time register, it will be used and |
| // we have to convert to real time first. After convertion we have following data: |
| // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970] |
| // time.tb_low [nanoseconds after the last full second above] |
| // We better use mread_real_time here instead of read_real_time |
| // to ensure that we will get a monotonic increasing time. |
| if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) { |
| rc = time_base_to_time(&time, TIMEBASE_SZ); |
| assert(rc != -1, "aix error at time_base_to_time()"); |
| } |
| return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low); |
| } |
| } |
| |
| void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { |
| info_ptr->max_value = ALL_64_BITS; |
| // mread_real_time() is monotonic (see 'os::javaTimeNanos()') |
| info_ptr->may_skip_backward = false; |
| info_ptr->may_skip_forward = false; |
| info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time |
| } |
| |
| // Return the real, user, and system times in seconds from an |
| // arbitrary fixed point in the past. |
| bool os::getTimesSecs(double* process_real_time, |
| double* process_user_time, |
| double* process_system_time) { |
| struct tms ticks; |
| clock_t real_ticks = times(&ticks); |
| |
| if (real_ticks == (clock_t) (-1)) { |
| return false; |
| } else { |
| double ticks_per_second = (double) clock_tics_per_sec; |
| *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; |
| *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; |
| *process_real_time = ((double) real_ticks) / ticks_per_second; |
| |
| return true; |
| } |
| } |
| |
| |
| char * os::local_time_string(char *buf, size_t buflen) { |
| struct tm t; |
| time_t long_time; |
| time(&long_time); |
| localtime_r(&long_time, &t); |
| jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", |
| t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, |
| t.tm_hour, t.tm_min, t.tm_sec); |
| return buf; |
| } |
| |
| struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { |
| return localtime_r(clock, res); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // runtime exit support |
| |
| // Note: os::shutdown() might be called very early during initialization, or |
| // called from signal handler. Before adding something to os::shutdown(), make |
| // sure it is async-safe and can handle partially initialized VM. |
| void os::shutdown() { |
| |
| // allow PerfMemory to attempt cleanup of any persistent resources |
| perfMemory_exit(); |
| |
| // needs to remove object in file system |
| AttachListener::abort(); |
| |
| // flush buffered output, finish log files |
| ostream_abort(); |
| |
| // Check for abort hook |
| abort_hook_t abort_hook = Arguments::abort_hook(); |
| if (abort_hook != NULL) { |
| abort_hook(); |
| } |
| |
| } |
| |
| // Note: os::abort() might be called very early during initialization, or |
| // called from signal handler. Before adding something to os::abort(), make |
| // sure it is async-safe and can handle partially initialized VM. |
| void os::abort(bool dump_core) { |
| os::shutdown(); |
| if (dump_core) { |
| #ifndef PRODUCT |
| fdStream out(defaultStream::output_fd()); |
| out.print_raw("Current thread is "); |
| char buf[16]; |
| jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); |
| out.print_raw_cr(buf); |
| out.print_raw_cr("Dumping core ..."); |
| #endif |
| ::abort(); // dump core |
| } |
| |
| ::exit(1); |
| } |
| |
| // Die immediately, no exit hook, no abort hook, no cleanup. |
| void os::die() { |
| ::abort(); |
| } |
| |
| // This method is a copy of JDK's sysGetLastErrorString |
| // from src/solaris/hpi/src/system_md.c |
| |
| size_t os::lasterror(char *buf, size_t len) { |
| |
| if (errno == 0) return 0; |
| |
| const char *s = ::strerror(errno); |
| size_t n = ::strlen(s); |
| if (n >= len) { |
| n = len - 1; |
| } |
| ::strncpy(buf, s, n); |
| buf[n] = '\0'; |
| return n; |
| } |
| |
| intx os::current_thread_id() { return (intx)pthread_self(); } |
| int os::current_process_id() { |
| |
| // This implementation returns a unique pid, the pid of the |
| // launcher thread that starts the vm 'process'. |
| |
| // Under POSIX, getpid() returns the same pid as the |
| // launcher thread rather than a unique pid per thread. |
| // Use gettid() if you want the old pre NPTL behaviour. |
| |
| // if you are looking for the result of a call to getpid() that |
| // returns a unique pid for the calling thread, then look at the |
| // OSThread::thread_id() method in osThread_linux.hpp file |
| |
| return (int)(_initial_pid ? _initial_pid : getpid()); |
| } |
| |
| // DLL functions |
| |
| const char* os::dll_file_extension() { return ".so"; } |
| |
| // This must be hard coded because it's the system's temporary |
| // directory not the java application's temp directory, ala java.io.tmpdir. |
| const char* os::get_temp_directory() { return "/tmp"; } |
| |
| static bool file_exists(const char* filename) { |
| struct stat statbuf; |
| if (filename == NULL || strlen(filename) == 0) { |
| return false; |
| } |
| return os::stat(filename, &statbuf) == 0; |
| } |
| |
| bool os::dll_build_name(char* buffer, size_t buflen, |
| const char* pname, const char* fname) { |
| bool retval = false; |
| // Copied from libhpi |
| const size_t pnamelen = pname ? strlen(pname) : 0; |
| |
| // Return error on buffer overflow. |
| if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { |
| *buffer = '\0'; |
| return retval; |
| } |
| |
| if (pnamelen == 0) { |
| snprintf(buffer, buflen, "lib%s.so", fname); |
| retval = true; |
| } else if (strchr(pname, *os::path_separator()) != NULL) { |
| int n; |
| char** pelements = split_path(pname, &n); |
| for (int i = 0; i < n; i++) { |
| // Really shouldn't be NULL, but check can't hurt |
| if (pelements[i] == NULL || strlen(pelements[i]) == 0) { |
| continue; // skip the empty path values |
| } |
| snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); |
| if (file_exists(buffer)) { |
| retval = true; |
| break; |
| } |
| } |
| // release the storage |
| for (int i = 0; i < n; i++) { |
| if (pelements[i] != NULL) { |
| FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
| } |
| } |
| if (pelements != NULL) { |
| FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
| } |
| } else { |
| snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); |
| retval = true; |
| } |
| return retval; |
| } |
| |
| // Check if addr is inside libjvm.so. |
| bool os::address_is_in_vm(address addr) { |
| |
| // Input could be a real pc or a function pointer literal. The latter |
| // would be a function descriptor residing in the data segment of a module. |
| |
| const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr); |
| if (lib) { |
| if (strcmp(lib->get_shortname(), "libjvm.so") == 0) { |
| return true; |
| } else { |
| return false; |
| } |
| } else { |
| lib = LoadedLibraries::find_for_data_address(addr); |
| if (lib) { |
| if (strcmp(lib->get_shortname(), "libjvm.so") == 0) { |
| return true; |
| } else { |
| return false; |
| } |
| } else { |
| return false; |
| } |
| } |
| } |
| |
| // Resolve an AIX function descriptor literal to a code pointer. |
| // If the input is a valid code pointer to a text segment of a loaded module, |
| // it is returned unchanged. |
| // If the input is a valid AIX function descriptor, it is resolved to the |
| // code entry point. |
| // If the input is neither a valid function descriptor nor a valid code pointer, |
| // NULL is returned. |
| static address resolve_function_descriptor_to_code_pointer(address p) { |
| |
| const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p); |
| if (lib) { |
| // its a real code pointer |
| return p; |
| } else { |
| lib = LoadedLibraries::find_for_data_address(p); |
| if (lib) { |
| // pointer to data segment, potential function descriptor |
| address code_entry = (address)(((FunctionDescriptor*)p)->entry()); |
| if (LoadedLibraries::find_for_text_address(code_entry)) { |
| // Its a function descriptor |
| return code_entry; |
| } |
| } |
| } |
| return NULL; |
| } |
| |
| bool os::dll_address_to_function_name(address addr, char *buf, |
| int buflen, int *offset) { |
| if (offset) { |
| *offset = -1; |
| } |
| if (buf) { |
| buf[0] = '\0'; |
| } |
| |
| // Resolve function ptr literals first. |
| addr = resolve_function_descriptor_to_code_pointer(addr); |
| if (!addr) { |
| return false; |
| } |
| |
| // Go through Decoder::decode to call getFuncName which reads the name from the traceback table. |
| return Decoder::decode(addr, buf, buflen, offset); |
| } |
| |
| static int getModuleName(codeptr_t pc, // [in] program counter |
| char* p_name, size_t namelen, // [out] optional: function name |
| char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages |
| ) { |
| |
| // initialize output parameters |
| if (p_name && namelen > 0) { |
| *p_name = '\0'; |
| } |
| if (p_errmsg && errmsglen > 0) { |
| *p_errmsg = '\0'; |
| } |
| |
| const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc); |
| if (lib) { |
| if (p_name && namelen > 0) { |
| sprintf(p_name, "%.*s", namelen, lib->get_shortname()); |
| } |
| return 0; |
| } |
| |
| if (Verbose) { |
| fprintf(stderr, "pc outside any module"); |
| } |
| |
| return -1; |
| |
| } |
| |
| bool os::dll_address_to_library_name(address addr, char* buf, |
| int buflen, int* offset) { |
| if (offset) { |
| *offset = -1; |
| } |
| if (buf) { |
| buf[0] = '\0'; |
| } |
| |
| // Resolve function ptr literals first. |
| addr = resolve_function_descriptor_to_code_pointer(addr); |
| if (!addr) { |
| return false; |
| } |
| |
| if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) { |
| return true; |
| } |
| return false; |
| } |
| |
| // Loads .dll/.so and in case of error it checks if .dll/.so was built |
| // for the same architecture as Hotspot is running on |
| void *os::dll_load(const char *filename, char *ebuf, int ebuflen) { |
| |
| if (ebuf && ebuflen > 0) { |
| ebuf[0] = '\0'; |
| ebuf[ebuflen - 1] = '\0'; |
| } |
| |
| if (!filename || strlen(filename) == 0) { |
| ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1); |
| return NULL; |
| } |
| |
| // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants. |
| void * result= ::dlopen(filename, RTLD_LAZY); |
| if (result != NULL) { |
| // Reload dll cache. Don't do this in signal handling. |
| LoadedLibraries::reload(); |
| return result; |
| } else { |
| // error analysis when dlopen fails |
| const char* const error_report = ::dlerror(); |
| if (error_report && ebuf && ebuflen > 0) { |
| snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s", |
| filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report); |
| } |
| } |
| return NULL; |
| } |
| |
| // Glibc-2.0 libdl is not MT safe. If you are building with any glibc, |
| // chances are you might want to run the generated bits against glibc-2.0 |
| // libdl.so, so always use locking for any version of glibc. |
| void* os::dll_lookup(void* handle, const char* name) { |
| pthread_mutex_lock(&dl_mutex); |
| void* res = dlsym(handle, name); |
| pthread_mutex_unlock(&dl_mutex); |
| return res; |
| } |
| |
| void* os::get_default_process_handle() { |
| return (void*)::dlopen(NULL, RTLD_LAZY); |
| } |
| |
| void os::print_dll_info(outputStream *st) { |
| st->print_cr("Dynamic libraries:"); |
| LoadedLibraries::print(st); |
| } |
| |
| void os::print_os_info(outputStream* st) { |
| st->print("OS:"); |
| |
| st->print("uname:"); |
| struct utsname name; |
| uname(&name); |
| st->print(name.sysname); st->print(" "); |
| st->print(name.nodename); st->print(" "); |
| st->print(name.release); st->print(" "); |
| st->print(name.version); st->print(" "); |
| st->print(name.machine); |
| st->cr(); |
| |
| // rlimit |
| st->print("rlimit:"); |
| struct rlimit rlim; |
| |
| st->print(" STACK "); |
| getrlimit(RLIMIT_STACK, &rlim); |
| if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
| else st->print("%uk", rlim.rlim_cur >> 10); |
| |
| st->print(", CORE "); |
| getrlimit(RLIMIT_CORE, &rlim); |
| if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
| else st->print("%uk", rlim.rlim_cur >> 10); |
| |
| st->print(", NPROC "); |
| st->print("%d", sysconf(_SC_CHILD_MAX)); |
| |
| st->print(", NOFILE "); |
| getrlimit(RLIMIT_NOFILE, &rlim); |
| if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
| else st->print("%d", rlim.rlim_cur); |
| |
| st->print(", AS "); |
| getrlimit(RLIMIT_AS, &rlim); |
| if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
| else st->print("%uk", rlim.rlim_cur >> 10); |
| |
| // Print limits on DATA, because it limits the C-heap. |
| st->print(", DATA "); |
| getrlimit(RLIMIT_DATA, &rlim); |
| if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
| else st->print("%uk", rlim.rlim_cur >> 10); |
| st->cr(); |
| |
| // load average |
| st->print("load average:"); |
| double loadavg[3] = {-1.L, -1.L, -1.L}; |
| os::loadavg(loadavg, 3); |
| st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); |
| st->cr(); |
| } |
| |
| void os::print_memory_info(outputStream* st) { |
| |
| st->print_cr("Memory:"); |
| |
| st->print_cr(" default page size: %s", describe_pagesize(os::vm_page_size())); |
| st->print_cr(" default stack page size: %s", describe_pagesize(os::vm_page_size())); |
| st->print_cr(" default shm page size: %s", describe_pagesize(os::Aix::shm_default_page_size())); |
| st->print_cr(" can use 64K pages dynamically: %s", (os::Aix::can_use_64K_pages() ? "yes" :"no")); |
| st->print_cr(" can use 16M pages dynamically: %s", (os::Aix::can_use_16M_pages() ? "yes" :"no")); |
| if (g_multipage_error != 0) { |
| st->print_cr(" multipage error: %d", g_multipage_error); |
| } |
| |
| // print out LDR_CNTRL because it affects the default page sizes |
| const char* const ldr_cntrl = ::getenv("LDR_CNTRL"); |
| st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>"); |
| |
| const char* const extshm = ::getenv("EXTSHM"); |
| st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>"); |
| |
| // Call os::Aix::get_meminfo() to retrieve memory statistics. |
| os::Aix::meminfo_t mi; |
| if (os::Aix::get_meminfo(&mi)) { |
| char buffer[256]; |
| if (os::Aix::on_aix()) { |
| jio_snprintf(buffer, sizeof(buffer), |
| " physical total : %llu\n" |
| " physical free : %llu\n" |
| " swap total : %llu\n" |
| " swap free : %llu\n", |
| mi.real_total, |
| mi.real_free, |
| mi.pgsp_total, |
| mi.pgsp_free); |
| } else { |
| Unimplemented(); |
| } |
| st->print_raw(buffer); |
| } else { |
| st->print_cr(" (no more information available)"); |
| } |
| } |
| |
| void os::pd_print_cpu_info(outputStream* st) { |
| // cpu |
| st->print("CPU:"); |
| st->print("total %d", os::processor_count()); |
| // It's not safe to query number of active processors after crash |
| // st->print("(active %d)", os::active_processor_count()); |
| st->print(" %s", VM_Version::cpu_features()); |
| st->cr(); |
| } |
| |
| void os::print_siginfo(outputStream* st, void* siginfo) { |
| // Use common posix version. |
| os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo); |
| st->cr(); |
| } |
| |
| |
| static void print_signal_handler(outputStream* st, int sig, |
| char* buf, size_t buflen); |
| |
| void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { |
| st->print_cr("Signal Handlers:"); |
| print_signal_handler(st, SIGSEGV, buf, buflen); |
| print_signal_handler(st, SIGBUS , buf, buflen); |
| print_signal_handler(st, SIGFPE , buf, buflen); |
| print_signal_handler(st, SIGPIPE, buf, buflen); |
| print_signal_handler(st, SIGXFSZ, buf, buflen); |
| print_signal_handler(st, SIGILL , buf, buflen); |
| print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); |
| print_signal_handler(st, SR_signum, buf, buflen); |
| print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); |
| print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); |
| print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); |
| print_signal_handler(st, BREAK_SIGNAL, buf, buflen); |
| print_signal_handler(st, SIGTRAP, buf, buflen); |
| print_signal_handler(st, SIGDANGER, buf, buflen); |
| } |
| |
| static char saved_jvm_path[MAXPATHLEN] = {0}; |
| |
| // Find the full path to the current module, libjvm.so or libjvm_g.so |
| void os::jvm_path(char *buf, jint buflen) { |
| // Error checking. |
| if (buflen < MAXPATHLEN) { |
| assert(false, "must use a large-enough buffer"); |
| buf[0] = '\0'; |
| return; |
| } |
| // Lazy resolve the path to current module. |
| if (saved_jvm_path[0] != 0) { |
| strcpy(buf, saved_jvm_path); |
| return; |
| } |
| |
| Dl_info dlinfo; |
| int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); |
| assert(ret != 0, "cannot locate libjvm"); |
| char* rp = realpath((char *)dlinfo.dli_fname, buf); |
| assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?"); |
| |
| strcpy(saved_jvm_path, buf); |
| } |
| |
| void os::print_jni_name_prefix_on(outputStream* st, int args_size) { |
| // no prefix required, not even "_" |
| } |
| |
| void os::print_jni_name_suffix_on(outputStream* st, int args_size) { |
| // no suffix required |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // sun.misc.Signal support |
| |
| static volatile jint sigint_count = 0; |
| |
| static void |
| UserHandler(int sig, void *siginfo, void *context) { |
| // 4511530 - sem_post is serialized and handled by the manager thread. When |
| // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We |
| // don't want to flood the manager thread with sem_post requests. |
| if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) |
| return; |
| |
| // Ctrl-C is pressed during error reporting, likely because the error |
| // handler fails to abort. Let VM die immediately. |
| if (sig == SIGINT && is_error_reported()) { |
| os::die(); |
| } |
| |
| os::signal_notify(sig); |
| } |
| |
| void* os::user_handler() { |
| return CAST_FROM_FN_PTR(void*, UserHandler); |
| } |
| |
| extern "C" { |
| typedef void (*sa_handler_t)(int); |
| typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); |
| } |
| |
| void* os::signal(int signal_number, void* handler) { |
| struct sigaction sigAct, oldSigAct; |
| |
| sigfillset(&(sigAct.sa_mask)); |
| |
| // Do not block out synchronous signals in the signal handler. |
| // Blocking synchronous signals only makes sense if you can really |
| // be sure that those signals won't happen during signal handling, |
| // when the blocking applies. Normal signal handlers are lean and |
| // do not cause signals. But our signal handlers tend to be "risky" |
| // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen. |
| // On AIX, PASE there was a case where a SIGSEGV happened, followed |
| // by a SIGILL, which was blocked due to the signal mask. The process |
| // just hung forever. Better to crash from a secondary signal than to hang. |
| sigdelset(&(sigAct.sa_mask), SIGSEGV); |
| sigdelset(&(sigAct.sa_mask), SIGBUS); |
| sigdelset(&(sigAct.sa_mask), SIGILL); |
| sigdelset(&(sigAct.sa_mask), SIGFPE); |
| sigdelset(&(sigAct.sa_mask), SIGTRAP); |
| |
| sigAct.sa_flags = SA_RESTART|SA_SIGINFO; |
| |
| sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); |
| |
| if (sigaction(signal_number, &sigAct, &oldSigAct)) { |
| // -1 means registration failed |
| return (void *)-1; |
| } |
| |
| return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); |
| } |
| |
| void os::signal_raise(int signal_number) { |
| ::raise(signal_number); |
| } |
| |
| // |
| // The following code is moved from os.cpp for making this |
| // code platform specific, which it is by its very nature. |
| // |
| |
| // Will be modified when max signal is changed to be dynamic |
| int os::sigexitnum_pd() { |
| return NSIG; |
| } |
| |
| // a counter for each possible signal value |
| static volatile jint pending_signals[NSIG+1] = { 0 }; |
| |
| // Linux(POSIX) specific hand shaking semaphore. |
| static sem_t sig_sem; |
| |
| void os::signal_init_pd() { |
| // Initialize signal structures |
| ::memset((void*)pending_signals, 0, sizeof(pending_signals)); |
| |
| // Initialize signal semaphore |
| int rc = ::sem_init(&sig_sem, 0, 0); |
| guarantee(rc != -1, "sem_init failed"); |
| } |
| |
| void os::signal_notify(int sig) { |
| Atomic::inc(&pending_signals[sig]); |
| ::sem_post(&sig_sem); |
| } |
| |
| static int check_pending_signals(bool wait) { |
| Atomic::store(0, &sigint_count); |
| for (;;) { |
| for (int i = 0; i < NSIG + 1; i++) { |
| jint n = pending_signals[i]; |
| if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { |
| return i; |
| } |
| } |
| if (!wait) { |
| return -1; |
| } |
| JavaThread *thread = JavaThread::current(); |
| ThreadBlockInVM tbivm(thread); |
| |
| bool threadIsSuspended; |
| do { |
| thread->set_suspend_equivalent(); |
| // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() |
| |
| ::sem_wait(&sig_sem); |
| |
| // were we externally suspended while we were waiting? |
| threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); |
| if (threadIsSuspended) { |
| // |
| // The semaphore has been incremented, but while we were waiting |
| // another thread suspended us. We don't want to continue running |
| // while suspended because that would surprise the thread that |
| // suspended us. |
| // |
| ::sem_post(&sig_sem); |
| |
| thread->java_suspend_self(); |
| } |
| } while (threadIsSuspended); |
| } |
| } |
| |
| int os::signal_lookup() { |
| return check_pending_signals(false); |
| } |
| |
| int os::signal_wait() { |
| return check_pending_signals(true); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Virtual Memory |
| |
| // AddrRange describes an immutable address range |
| // |
| // This is a helper class for the 'shared memory bookkeeping' below. |
| class AddrRange { |
| friend class ShmBkBlock; |
| |
| char* _start; |
| size_t _size; |
| |
| public: |
| |
| AddrRange(char* start, size_t size) |
| : _start(start), _size(size) |
| {} |
| |
| AddrRange(const AddrRange& r) |
| : _start(r.start()), _size(r.size()) |
| {} |
| |
| char* start() const { return _start; } |
| size_t size() const { return _size; } |
| char* end() const { return _start + _size; } |
| bool is_empty() const { return _size == 0 ? true : false; } |
| |
| static AddrRange empty_range() { return AddrRange(NULL, 0); } |
| |
| bool contains(const char* p) const { |
| return start() <= p && end() > p; |
| } |
| |
| bool contains(const AddrRange& range) const { |
| return start() <= range.start() && end() >= range.end(); |
| } |
| |
| bool intersects(const AddrRange& range) const { |
| return (range.start() <= start() && range.end() > start()) || |
| (range.start() < end() && range.end() >= end()) || |
| contains(range); |
| } |
| |
| bool is_same_range(const AddrRange& range) const { |
| return start() == range.start() && size() == range.size(); |
| } |
| |
| // return the closest inside range consisting of whole pages |
| AddrRange find_closest_aligned_range(size_t pagesize) const { |
| if (pagesize == 0 || is_empty()) { |
| return empty_range(); |
| } |
| char* const from = (char*)align_size_up((intptr_t)_start, pagesize); |
| char* const to = (char*)align_size_down((intptr_t)end(), pagesize); |
| if (from > to) { |
| return empty_range(); |
| } |
| return AddrRange(from, to - from); |
| } |
| }; |
| |
| //////////////////////////////////////////////////////////////////////////// |
| // shared memory bookkeeping |
| // |
| // the os::reserve_memory() API and friends hand out different kind of memory, depending |
| // on need and circumstances. Memory may be allocated with mmap() or with shmget/shmat. |
| // |
| // But these memory types have to be treated differently. For example, to uncommit |
| // mmap-based memory, msync(MS_INVALIDATE) is needed, to uncommit shmat-based memory, |
| // disclaim64() is needed. |
| // |
| // Therefore we need to keep track of the allocated memory segments and their |
| // properties. |
| |
| // ShmBkBlock: base class for all blocks in the shared memory bookkeeping |
| class ShmBkBlock : public CHeapObj<mtInternal> { |
| |
| ShmBkBlock* _next; |
| |
| protected: |
| |
| AddrRange _range; |
| const size_t _pagesize; |
| const bool _pinned; |
| |
| public: |
| |
| ShmBkBlock(AddrRange range, size_t pagesize, bool pinned) |
| : _range(range), _pagesize(pagesize), _pinned(pinned) , _next(NULL) { |
| |
| assert(_pagesize == SIZE_4K || _pagesize == SIZE_64K || _pagesize == SIZE_16M, "invalid page size"); |
| assert(!_range.is_empty(), "invalid range"); |
| } |
| |
| virtual void print(outputStream* st) const { |
| st->print("0x%p ... 0x%p (%llu) - %d %s pages - %s", |
| _range.start(), _range.end(), _range.size(), |
| _range.size() / _pagesize, describe_pagesize(_pagesize), |
| _pinned ? "pinned" : ""); |
| } |
| |
| enum Type { MMAP, SHMAT }; |
| virtual Type getType() = 0; |
| |
| char* base() const { return _range.start(); } |
| size_t size() const { return _range.size(); } |
| |
| void setAddrRange(AddrRange range) { |
| _range = range; |
| } |
| |
| bool containsAddress(const char* p) const { |
| return _range.contains(p); |
| } |
| |
| bool containsRange(const char* p, size_t size) const { |
| return _range.contains(AddrRange((char*)p, size)); |
| } |
| |
| bool isSameRange(const char* p, size_t size) const { |
| return _range.is_same_range(AddrRange((char*)p, size)); |
| } |
| |
| virtual bool disclaim(char* p, size_t size) = 0; |
| virtual bool release() = 0; |
| |
| // blocks live in a list. |
| ShmBkBlock* next() const { return _next; } |
| void set_next(ShmBkBlock* blk) { _next = blk; } |
| |
| }; // end: ShmBkBlock |
| |
| |
| // ShmBkMappedBlock: describes an block allocated with mmap() |
| class ShmBkMappedBlock : public ShmBkBlock { |
| public: |
| |
| ShmBkMappedBlock(AddrRange range) |
| : ShmBkBlock(range, SIZE_4K, false) {} // mmap: always 4K, never pinned |
| |
| void print(outputStream* st) const { |
| ShmBkBlock::print(st); |
| st->print_cr(" - mmap'ed"); |
| } |
| |
| Type getType() { |
| return MMAP; |
| } |
| |
| bool disclaim(char* p, size_t size) { |
| |
| AddrRange r(p, size); |
| |
| guarantee(_range.contains(r), "invalid disclaim"); |
| |
| // only disclaim whole ranges. |
| const AddrRange r2 = r.find_closest_aligned_range(_pagesize); |
| if (r2.is_empty()) { |
| return true; |
| } |
| |
| const int rc = ::msync(r2.start(), r2.size(), MS_INVALIDATE); |
| |
| if (rc != 0) { |
| warning("msync(0x%p, %llu, MS_INVALIDATE) failed (%d)\n", r2.start(), r2.size(), errno); |
| } |
| |
| return rc == 0 ? true : false; |
| } |
| |
| bool release() { |
| // mmap'ed blocks are released using munmap |
| if (::munmap(_range.start(), _range.size()) != 0) { |
| warning("munmap(0x%p, %llu) failed (%d)\n", _range.start(), _range.size(), errno); |
| return false; |
| } |
| return true; |
| } |
| }; // end: ShmBkMappedBlock |
| |
| // ShmBkShmatedBlock: describes an block allocated with shmget/shmat() |
| class ShmBkShmatedBlock : public ShmBkBlock { |
| public: |
| |
| ShmBkShmatedBlock(AddrRange range, size_t pagesize, bool pinned) |
| : ShmBkBlock(range, pagesize, pinned) {} |
| |
| void print(outputStream* st) const { |
| ShmBkBlock::print(st); |
| st->print_cr(" - shmat'ed"); |
| } |
| |
| Type getType() { |
| return SHMAT; |
| } |
| |
| bool disclaim(char* p, size_t size) { |
| |
| AddrRange r(p, size); |
| |
| if (_pinned) { |
| return true; |
| } |
| |
| // shmat'ed blocks are disclaimed using disclaim64 |
| guarantee(_range.contains(r), "invalid disclaim"); |
| |
| // only disclaim whole ranges. |
| const AddrRange r2 = r.find_closest_aligned_range(_pagesize); |
| if (r2.is_empty()) { |
| return true; |
| } |
| |
| const bool rc = my_disclaim64(r2.start(), r2.size()); |
| |
| if (Verbose && !rc) { |
| warning("failed to disclaim shm %p-%p\n", r2.start(), r2.end()); |
| } |
| |
| return rc; |
| } |
| |
| bool release() { |
| bool rc = false; |
| if (::shmdt(_range.start()) != 0) { |
| warning("shmdt(0x%p) failed (%d)\n", _range.start(), errno); |
| } else { |
| rc = true; |
| } |
| return rc; |
| } |
| |
| }; // end: ShmBkShmatedBlock |
| |
| static ShmBkBlock* g_shmbk_list = NULL; |
| static volatile jint g_shmbk_table_lock = 0; |
| |
| // keep some usage statistics |
| static struct { |
| int nodes; // number of nodes in list |
| size_t bytes; // reserved - not committed - bytes. |
| int reserves; // how often reserve was called |
| int lookups; // how often a lookup was made |
| } g_shmbk_stats = { 0, 0, 0, 0 }; |
| |
| // add information about a shared memory segment to the bookkeeping |
| static void shmbk_register(ShmBkBlock* p_block) { |
| guarantee(p_block, "logic error"); |
| p_block->set_next(g_shmbk_list); |
| g_shmbk_list = p_block; |
| g_shmbk_stats.reserves ++; |
| g_shmbk_stats.bytes += p_block->size(); |
| g_shmbk_stats.nodes ++; |
| } |
| |
| // remove information about a shared memory segment by its starting address |
| static void shmbk_unregister(ShmBkBlock* p_block) { |
| ShmBkBlock* p = g_shmbk_list; |
| ShmBkBlock* prev = NULL; |
| while (p) { |
| if (p == p_block) { |
| if (prev) { |
| prev->set_next(p->next()); |
| } else { |
| g_shmbk_list = p->next(); |
| } |
| g_shmbk_stats.nodes --; |
| g_shmbk_stats.bytes -= p->size(); |
| return; |
| } |
| prev = p; |
| p = p->next(); |
| } |
| assert(false, "should not happen"); |
| } |
| |
| // given a pointer, return shared memory bookkeeping record for the segment it points into |
| // using the returned block info must happen under lock protection |
| static ShmBkBlock* shmbk_find_by_containing_address(const char* addr) { |
| g_shmbk_stats.lookups ++; |
| ShmBkBlock* p = g_shmbk_list; |
| while (p) { |
| if (p->containsAddress(addr)) { |
| return p; |
| } |
| p = p->next(); |
| } |
| return NULL; |
| } |
| |
| // dump all information about all memory segments allocated with os::reserve_memory() |
| void shmbk_dump_info() { |
| tty->print_cr("-- shared mem bookkeeping (alive: %d segments, %llu bytes, " |
| "total reserves: %d total lookups: %d)", |
| g_shmbk_stats.nodes, g_shmbk_stats.bytes, g_shmbk_stats.reserves, g_shmbk_stats.lookups); |
| const ShmBkBlock* p = g_shmbk_list; |
| int i = 0; |
| while (p) { |
| p->print(tty); |
| p = p->next(); |
| i ++; |
| } |
| } |
| |
| #define LOCK_SHMBK { ThreadCritical _LOCK_SHMBK; |
| #define UNLOCK_SHMBK } |
| |
| // End: shared memory bookkeeping |
| //////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| int os::vm_page_size() { |
| // Seems redundant as all get out |
| assert(os::Aix::page_size() != -1, "must call os::init"); |
| return os::Aix::page_size(); |
| } |
| |
| // Aix allocates memory by pages. |
| int os::vm_allocation_granularity() { |
| assert(os::Aix::page_size() != -1, "must call os::init"); |
| return os::Aix::page_size(); |
| } |
| |
| int os::Aix::commit_memory_impl(char* addr, size_t size, bool exec) { |
| |
| // Commit is a noop. There is no explicit commit |
| // needed on AIX. Memory is committed when touched. |
| // |
| // Debug : check address range for validity |
| #ifdef ASSERT |
| LOCK_SHMBK |
| ShmBkBlock* const block = shmbk_find_by_containing_address(addr); |
| if (!block) { |
| fprintf(stderr, "invalid pointer: " INTPTR_FORMAT "\n", addr); |
| shmbk_dump_info(); |
| assert(false, "invalid pointer"); |
| return false; |
| } else if (!block->containsRange(addr, size)) { |
| fprintf(stderr, "invalid range: " INTPTR_FORMAT " .. " INTPTR_FORMAT "\n", addr, addr + size); |
| shmbk_dump_info(); |
| assert(false, "invalid range"); |
| return false; |
| } |
| UNLOCK_SHMBK |
| #endif // ASSERT |
| |
| return 0; |
| } |
| |
| bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
| return os::Aix::commit_memory_impl(addr, size, exec) == 0; |
| } |
| |
| void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
| const char* mesg) { |
| assert(mesg != NULL, "mesg must be specified"); |
| os::Aix::commit_memory_impl(addr, size, exec); |
| } |
| |
| int os::Aix::commit_memory_impl(char* addr, size_t size, |
| size_t alignment_hint, bool exec) { |
| return os::Aix::commit_memory_impl(addr, size, exec); |
| } |
| |
| bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
| bool exec) { |
| return os::Aix::commit_memory_impl(addr, size, alignment_hint, exec) == 0; |
| } |
| |
| void os::pd_commit_memory_or_exit(char* addr, size_t size, |
| size_t alignment_hint, bool exec, |
| const char* mesg) { |
| os::Aix::commit_memory_impl(addr, size, alignment_hint, exec); |
| } |
| |
| bool os::pd_uncommit_memory(char* addr, size_t size) { |
| |
| // Delegate to ShmBkBlock class which knows how to uncommit its memory. |
| |
| bool rc = false; |
| LOCK_SHMBK |
| ShmBkBlock* const block = shmbk_find_by_containing_address(addr); |
| if (!block) { |
| fprintf(stderr, "invalid pointer: 0x%p.\n", addr); |
| shmbk_dump_info(); |
| assert(false, "invalid pointer"); |
| return false; |
| } else if (!block->containsRange(addr, size)) { |
| fprintf(stderr, "invalid range: 0x%p .. 0x%p.\n", addr, addr + size); |
| shmbk_dump_info(); |
| assert(false, "invalid range"); |
| return false; |
| } |
| rc = block->disclaim(addr, size); |
| UNLOCK_SHMBK |
| |
| if (Verbose && !rc) { |
| warning("failed to disclaim 0x%p .. 0x%p (0x%llX bytes).", addr, addr + size, size); |
| } |
| return rc; |
| } |
| |
| bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
| return os::guard_memory(addr, size); |
| } |
| |
| bool os::remove_stack_guard_pages(char* addr, size_t size) { |
| return os::unguard_memory(addr, size); |
| } |
| |
| void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| } |
| |
| void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| } |
| |
| void os::numa_make_global(char *addr, size_t bytes) { |
| } |
| |
| void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { |
| } |
| |
| bool os::numa_topology_changed() { |
| return false; |
| } |
| |
| size_t os::numa_get_groups_num() { |
| return 1; |
| } |
| |
| int os::numa_get_group_id() { |
| return 0; |
| } |
| |
| size_t os::numa_get_leaf_groups(int *ids, size_t size) { |
| if (size > 0) { |
| ids[0] = 0; |
| return 1; |
| } |
| return 0; |
| } |
| |
| bool os::get_page_info(char *start, page_info* info) { |
| return false; |
| } |
| |
| char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { |
| return end; |
| } |
| |
| // Flags for reserve_shmatted_memory: |
| #define RESSHM_WISHADDR_OR_FAIL 1 |
| #define RESSHM_TRY_16M_PAGES 2 |
| #define RESSHM_16M_PAGES_OR_FAIL 4 |
| |
| // Result of reserve_shmatted_memory: |
| struct shmatted_memory_info_t { |
| char* addr; |
| size_t pagesize; |
| bool pinned; |
| }; |
| |
| // Reserve a section of shmatted memory. |
| // params: |
| // bytes [in]: size of memory, in bytes |
| // requested_addr [in]: wish address. |
| // NULL = no wish. |
| // If RESSHM_WISHADDR_OR_FAIL is set in flags and wish address cannot |
| // be obtained, function will fail. Otherwise wish address is treated as hint and |
| // another pointer is returned. |
| // flags [in]: some flags. Valid flags are: |
| // RESSHM_WISHADDR_OR_FAIL - fail if wish address is given and cannot be obtained. |
| // RESSHM_TRY_16M_PAGES - try to allocate from 16M page pool |
| // (requires UseLargePages and Use16MPages) |
| // RESSHM_16M_PAGES_OR_FAIL - if you cannot allocate from 16M page pool, fail. |
| // Otherwise any other page size will do. |
| // p_info [out] : holds information about the created shared memory segment. |
| static bool reserve_shmatted_memory(size_t bytes, char* requested_addr, int flags, shmatted_memory_info_t* p_info) { |
| |
| assert(p_info, "parameter error"); |
| |
| // init output struct. |
| p_info->addr = NULL; |
| |
| // neither should we be here for EXTSHM=ON. |
| if (os::Aix::extshm()) { |
| ShouldNotReachHere(); |
| } |
| |
| // extract flags. sanity checks. |
| const bool wishaddr_or_fail = |
| flags & RESSHM_WISHADDR_OR_FAIL; |
| const bool try_16M_pages = |
| flags & RESSHM_TRY_16M_PAGES; |
| const bool f16M_pages_or_fail = |
| flags & RESSHM_16M_PAGES_OR_FAIL; |
| |
| // first check: if a wish address is given and it is mandatory, but not aligned to segment boundary, |
| // shmat will fail anyway, so save some cycles by failing right away |
| if (requested_addr && ((uintptr_t)requested_addr % SIZE_256M == 0)) { |
| if (wishaddr_or_fail) { |
| return false; |
| } else { |
| requested_addr = NULL; |
| } |
| } |
| |
| char* addr = NULL; |
| |
| // Align size of shm up to the largest possible page size, to avoid errors later on when we try to change |
| // pagesize dynamically. |
| const size_t size = align_size_up(bytes, SIZE_16M); |
| |
| // reserve the shared segment |
| int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR); |
| if (shmid == -1) { |
| warning("shmget(.., %lld, ..) failed (errno: %d).", size, errno); |
| return false; |
| } |
| |
| // Important note: |
| // It is very important that we, upon leaving this function, do not leave a shm segment alive. |
| // We must right after attaching it remove it from the system. System V shm segments are global and |
| // survive the process. |
| // So, from here on: Do not assert. Do not return. Always do a "goto cleanup_shm". |
| |
| // try forcing the page size |
| size_t pagesize = -1; // unknown so far |
| |
| if (UseLargePages) { |
| |
| struct shmid_ds shmbuf; |
| memset(&shmbuf, 0, sizeof(shmbuf)); |
| |
| // First, try to take from 16M page pool if... |
| if (os::Aix::can_use_16M_pages() // we can ... |
| && Use16MPages // we are not explicitly forbidden to do so (-XX:-Use16MPages).. |
| && try_16M_pages) { // caller wants us to. |
| shmbuf.shm_pagesize = SIZE_16M; |
| if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) { |
| pagesize = SIZE_16M; |
| } else { |
| warning("Failed to allocate %d 16M pages. 16M page pool might be exhausted. (shmctl failed with %d)", |
| size / SIZE_16M, errno); |
| if (f16M_pages_or_fail) { |
| goto cleanup_shm; |
| } |
| } |
| } |
| |
| // Nothing yet? Try setting 64K pages. Note that I never saw this fail, but in theory it might, |
| // because the 64K page pool may also be exhausted. |
| if (pagesize == -1) { |
| shmbuf.shm_pagesize = SIZE_64K; |
| if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) { |
| pagesize = SIZE_64K; |
| } else { |
| warning("Failed to allocate %d 64K pages. (shmctl failed with %d)", |
| size / SIZE_64K, errno); |
| // here I give up. leave page_size -1 - later, after attaching, we will query the |
| // real page size of the attached memory. (in theory, it may be something different |
| // from 4K if LDR_CNTRL SHM_PSIZE is set) |
| } |
| } |
| } |
| |
| // sanity point |
| assert(pagesize == -1 || pagesize == SIZE_16M || pagesize == SIZE_64K, "wrong page size"); |
| |
| // Now attach the shared segment. |
| addr = (char*) shmat(shmid, requested_addr, 0); |
| if (addr == (char*)-1) { |
| // How to handle attach failure: |
| // If it failed for a specific wish address, tolerate this: in that case, if wish address was |
| // mandatory, fail, if not, retry anywhere. |
| // If it failed for any other reason, treat that as fatal error. |
| addr = NULL; |
| if (requested_addr) { |
| if (wishaddr_or_fail) { |
| goto cleanup_shm; |
| } else { |
| addr = (char*) shmat(shmid, NULL, 0); |
| if (addr == (char*)-1) { // fatal |
| addr = NULL; |
| warning("shmat failed (errno: %d)", errno); |
| goto cleanup_shm; |
| } |
| } |
| } else { // fatal |
| addr = NULL; |
| warning("shmat failed (errno: %d)", errno); |
| goto cleanup_shm; |
| } |
| } |
| |
| // sanity point |
| assert(addr && addr != (char*) -1, "wrong address"); |
| |
| // after successful Attach remove the segment - right away. |
| if (::shmctl(shmid, IPC_RMID, NULL) == -1) { |
| warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno); |
| guarantee(false, "failed to remove shared memory segment!"); |
| } |
| shmid = -1; |
| |
| // query the real page size. In case setting the page size did not work (see above), the system |
| // may have given us something other then 4K (LDR_CNTRL) |
| { |
| const size_t real_pagesize = os::Aix::query_pagesize(addr); |
| if (pagesize != -1) { |
| assert(pagesize == real_pagesize, "unexpected pagesize after shmat"); |
| } else { |
| pagesize = real_pagesize; |
| } |
| } |
| |
| // Now register the reserved block with internal book keeping. |
| LOCK_SHMBK |
| const bool pinned = pagesize >= SIZE_16M ? true : false; |
| ShmBkShmatedBlock* const p_block = new ShmBkShmatedBlock(AddrRange(addr, size), pagesize, pinned); |
| assert(p_block, ""); |
| shmbk_register(p_block); |
| UNLOCK_SHMBK |
| |
| cleanup_shm: |
| |
| // if we have not done so yet, remove the shared memory segment. This is very important. |
| if (shmid != -1) { |
| if (::shmctl(shmid, IPC_RMID, NULL) == -1) { |
| warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno); |
| guarantee(false, "failed to remove shared memory segment!"); |
| } |
| shmid = -1; |
| } |
| |
| // trace |
| if (Verbose && !addr) { |
| if (requested_addr != NULL) { |
| warning("failed to shm-allocate 0x%llX bytes at wish address 0x%p.", size, requested_addr); |
| } else { |
| warning("failed to shm-allocate 0x%llX bytes at any address.", size); |
| } |
| } |
| |
| // hand info to caller |
| if (addr) { |
| p_info->addr = addr; |
| p_info->pagesize = pagesize; |
| p_info->pinned = pagesize == SIZE_16M ? true : false; |
| } |
| |
| // sanity test: |
| if (requested_addr && addr && wishaddr_or_fail) { |
| guarantee(addr == requested_addr, "shmat error"); |
| } |
| |
| // just one more test to really make sure we have no dangling shm segments. |
| guarantee(shmid == -1, "dangling shm segments"); |
| |
| return addr ? true : false; |
| |
| } // end: reserve_shmatted_memory |
| |
| // Reserve memory using mmap. Behaves the same as reserve_shmatted_memory(): |
| // will return NULL in case of an error. |
| static char* reserve_mmaped_memory(size_t bytes, char* requested_addr) { |
| |
| // if a wish address is given, but not aligned to 4K page boundary, mmap will fail. |
| if (requested_addr && ((uintptr_t)requested_addr % os::vm_page_size() != 0)) { |
| warning("Wish address 0x%p not aligned to page boundary.", requested_addr); |
| return NULL; |
| } |
| |
| const size_t size = align_size_up(bytes, SIZE_4K); |
| |
| // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to |
| // msync(MS_INVALIDATE) (see os::uncommit_memory) |
| int flags = MAP_ANONYMOUS | MAP_SHARED; |
| |
| // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what |
| // it means if wishaddress is given but MAP_FIXED is not set. |
| // |
| // Note however that this changes semantics in SPEC1170 mode insofar as MAP_FIXED |
| // clobbers the address range, which is probably not what the caller wants. That's |
| // why I assert here (again) that the SPEC1170 compat mode is off. |
| // If we want to be able to run under SPEC1170, we have to do some porting and |
| // testing. |
| if (requested_addr != NULL) { |
| assert(!os::Aix::xpg_sus_mode(), "SPEC1170 mode not allowed."); |
| flags |= MAP_FIXED; |
| } |
| |
| char* addr = (char*)::mmap(requested_addr, size, PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0); |
| |
| if (addr == MAP_FAILED) { |
| // attach failed: tolerate for specific wish addresses. Not being able to attach |
| // anywhere is a fatal error. |
| if (requested_addr == NULL) { |
| // It's ok to fail here if the machine has not enough memory. |
| warning("mmap(NULL, 0x%llX, ..) failed (%d)", size, errno); |
| } |
| addr = NULL; |
| goto cleanup_mmap; |
| } |
| |
| // If we did request a specific address and that address was not available, fail. |
| if (addr && requested_addr) { |
| guarantee(addr == requested_addr, "unexpected"); |
| } |
| |
| // register this mmap'ed segment with book keeping |
| LOCK_SHMBK |
| ShmBkMappedBlock* const p_block = new ShmBkMappedBlock(AddrRange(addr, size)); |
| assert(p_block, ""); |
| shmbk_register(p_block); |
| UNLOCK_SHMBK |
| |
| cleanup_mmap: |
| |
| // trace |
| if (Verbose) { |
| if (addr) { |
| fprintf(stderr, "mmap-allocated 0x%p .. 0x%p (0x%llX bytes)\n", addr, addr + bytes, bytes); |
| } |
| else { |
| if (requested_addr != NULL) { |
| warning("failed to mmap-allocate 0x%llX bytes at wish address 0x%p.", bytes, requested_addr); |
| } else { |
| warning("failed to mmap-allocate 0x%llX bytes at any address.", bytes); |
| } |
| } |
| } |
| |
| return addr; |
| |
| } // end: reserve_mmaped_memory |
| |
| // Reserves and attaches a shared memory segment. |
| // Will assert if a wish address is given and could not be obtained. |
| char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { |
| return os::attempt_reserve_memory_at(bytes, requested_addr); |
| } |
| |
| bool os::pd_release_memory(char* addr, size_t size) { |
| |
| // delegate to ShmBkBlock class which knows how to uncommit its memory. |
| |
| bool rc = false; |
| LOCK_SHMBK |
| ShmBkBlock* const block = shmbk_find_by_containing_address(addr); |
| if (!block) { |
| fprintf(stderr, "invalid pointer: 0x%p.\n", addr); |
| shmbk_dump_info(); |
| assert(false, "invalid pointer"); |
| return false; |
| } |
| else if (!block->isSameRange(addr, size)) { |
| if (block->getType() == ShmBkBlock::MMAP) { |
| // Release only the same range or a the beginning or the end of a range. |
| if (block->base() == addr && size < block->size()) { |
| ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base() + size, block->size() - size)); |
| assert(b, ""); |
| shmbk_register(b); |
| block->setAddrRange(AddrRange(addr, size)); |
| } |
| else if (addr > block->base() && addr + size == block->base() + block->size()) { |
| ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base(), block->size() - size)); |
| assert(b, ""); |
| shmbk_register(b); |
| block->setAddrRange(AddrRange(addr, size)); |
| } |
| else { |
| fprintf(stderr, "invalid mmap range: 0x%p .. 0x%p.\n", addr, addr + size); |
| shmbk_dump_info(); |
| assert(false, "invalid mmap range"); |
| return false; |
| } |
| } |
| else { |
| // Release only the same range. No partial release allowed. |
| // Soften the requirement a bit, because the user may think he owns a smaller size |
| // than the block is due to alignment etc. |
| if (block->base() != addr || block->size() < size) { |
| fprintf(stderr, "invalid shmget range: 0x%p .. 0x%p.\n", addr, addr + size); |
| shmbk_dump_info(); |
| assert(false, "invalid shmget range"); |
| return false; |
| } |
| } |
| } |
| rc = block->release(); |
| assert(rc, "release failed"); |
| // remove block from bookkeeping |
| shmbk_unregister(block); |
| delete block; |
| UNLOCK_SHMBK |
| |
| if (!rc) { |
| warning("failed to released %lu bytes at 0x%p", size, addr); |
| } |
| |
| return rc; |
| } |
| |
| static bool checked_mprotect(char* addr, size_t size, int prot) { |
| |
| // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will |
| // not tell me if protection failed when trying to protect an un-protectable range. |
| // |
| // This means if the memory was allocated using shmget/shmat, protection wont work |
| // but mprotect will still return 0: |
| // |
| // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm |
| |
| bool rc = ::mprotect(addr, size, prot) == 0 ? true : false; |
| |
| if (!rc) { |
| const char* const s_errno = strerror(errno); |
| warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno); |
| return false; |
| } |
| |
| // mprotect success check |
| // |
| // Mprotect said it changed the protection but can I believe it? |
| // |
| // To be sure I need to check the protection afterwards. Try to |
| // read from protected memory and check whether that causes a segfault. |
| // |
| if (!os::Aix::xpg_sus_mode()) { |
| |
| if (StubRoutines::SafeFetch32_stub()) { |
| |
| const bool read_protected = |
| (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && |
| SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; |
| |
| if (prot & PROT_READ) { |
| rc = !read_protected; |
| } else { |
| rc = read_protected; |
| } |
| } |
| } |
| if (!rc) { |
| assert(false, "mprotect failed."); |
| } |
| return rc; |
| } |
| |
| // Set protections specified |
| bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) { |
| unsigned int p = 0; |
| switch (prot) { |
| case MEM_PROT_NONE: p = PROT_NONE; break; |
| case MEM_PROT_READ: p = PROT_READ; break; |
| case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; |
| case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; |
| default: |
| ShouldNotReachHere(); |
| } |
| // is_committed is unused. |
| return checked_mprotect(addr, size, p); |
| } |
| |
| bool os::guard_memory(char* addr, size_t size) { |
| return checked_mprotect(addr, size, PROT_NONE); |
| } |
| |
| bool os::unguard_memory(char* addr, size_t size) { |
| return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC); |
| } |
| |
| // Large page support |
| |
| static size_t _large_page_size = 0; |
| |
| // Enable large page support if OS allows that. |
| void os::large_page_init() { |
| |
| // Note: os::Aix::query_multipage_support must run first. |
| |
| if (!UseLargePages) { |
| return; |
| } |
| |
| if (!Aix::can_use_64K_pages()) { |
| assert(!Aix::can_use_16M_pages(), "64K is a precondition for 16M."); |
| UseLargePages = false; |
| return; |
| } |
| |
| if (!Aix::can_use_16M_pages() && Use16MPages) { |
| fprintf(stderr, "Cannot use 16M pages. Please ensure that there is a 16M page pool " |
| " and that the VM runs with CAP_BYPASS_RAC_VMM and CAP_PROPAGATE capabilities.\n"); |
| } |
| |
| // Do not report 16M page alignment as part of os::_page_sizes if we are |
| // explicitly forbidden from using 16M pages. Doing so would increase the |
| // alignment the garbage collector calculates with, slightly increasing |
| // heap usage. We should only pay for 16M alignment if we really want to |
| // use 16M pages. |
| if (Use16MPages && Aix::can_use_16M_pages()) { |
| _large_page_size = SIZE_16M; |
| _page_sizes[0] = SIZE_16M; |
| _page_sizes[1] = SIZE_64K; |
| _page_sizes[2] = SIZE_4K; |
| _page_sizes[3] = 0; |
| } else if (Aix::can_use_64K_pages()) { |
| _large_page_size = SIZE_64K; |
| _page_sizes[0] = SIZE_64K; |
| _page_sizes[1] = SIZE_4K; |
| _page_sizes[2] = 0; |
| } |
| |
| if (Verbose) { |
| ("Default large page size is 0x%llX.", _large_page_size); |
| } |
| } // end: os::large_page_init() |
| |
| char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
| // "exec" is passed in but not used. Creating the shared image for |
| // the code cache doesn't have an SHM_X executable permission to check. |
| Unimplemented(); |
| return 0; |
| } |
| |
| bool os::release_memory_special(char* base, size_t bytes) { |
| // detaching the SHM segment will also delete it, see reserve_memory_special() |
| Unimplemented(); |
| return false; |
| } |
| |
| size_t os::large_page_size() { |
| return _large_page_size; |
| } |
| |
| bool os::can_commit_large_page_memory() { |
| // Well, sadly we cannot commit anything at all (see comment in |
| // os::commit_memory) but we claim to so we can make use of large pages |
| return true; |
| } |
| |
| bool os::can_execute_large_page_memory() { |
| // We can do that |
| return true; |
| } |
| |
| // Reserve memory at an arbitrary address, only if that area is |
| // available (and not reserved for something else). |
| char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
| |
| bool use_mmap = false; |
| |
| // mmap: smaller graining, no large page support |
| // shm: large graining (256M), large page support, limited number of shm segments |
| // |
| // Prefer mmap wherever we either do not need large page support or have OS limits |
| |
| if (!UseLargePages || bytes < SIZE_16M) { |
| use_mmap = true; |
| } |
| |
| char* addr = NULL; |
| if (use_mmap) { |
| addr = reserve_mmaped_memory(bytes, requested_addr); |
| } else { |
| // shmat: wish address is mandatory, and do not try 16M pages here. |
| shmatted_memory_info_t info; |
| const int flags = RESSHM_WISHADDR_OR_FAIL; |
| if (reserve_shmatted_memory(bytes, requested_addr, flags, &info)) { |
| addr = info.addr; |
| } |
| } |
| |
| return addr; |
| } |
| |
| size_t os::read(int fd, void *buf, unsigned int nBytes) { |
| return ::read(fd, buf, nBytes); |
| } |
| |
| void os::naked_short_sleep(jlong ms) { |
| struct timespec req; |
| |
| assert(ms < 1000, "Un-interruptable sleep, short time use only"); |
| req.tv_sec = 0; |
| if (ms > 0) { |
| req.tv_nsec = (ms % 1000) * 1000000; |
| } |
| else { |
| req.tv_nsec = 1; |
| } |
| |
| nanosleep(&req, NULL); |
| |
| return; |
| } |
| |
| // Sleep forever; naked call to OS-specific sleep; use with CAUTION |
| void os::infinite_sleep() { |
| while (true) { // sleep forever ... |
| ::sleep(100); // ... 100 seconds at a time |
| } |
| } |
| |
| // Used to convert frequent JVM_Yield() to nops |
| bool os::dont_yield() { |
| return DontYieldALot; |
| } |
| |
| void os::naked_yield() { |
| sched_yield(); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // thread priority support |
| |
| // From AIX manpage to pthread_setschedparam |
| // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp? |
| // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm): |
| // |
| // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the |
| // range from 40 to 80, where 40 is the least favored priority and 80 |
| // is the most favored." |
| // |
| // (Actually, I doubt this even has an impact on AIX, as we do kernel |
| // scheduling there; however, this still leaves iSeries.) |
| // |
| // We use the same values for AIX and PASE. |
| int os::java_to_os_priority[CriticalPriority + 1] = { |
| 54, // 0 Entry should never be used |
| |
| 55, // 1 MinPriority |
| 55, // 2 |
| 56, // 3 |
| |
| 56, // 4 |
| 57, // 5 NormPriority |
| 57, // 6 |
| |
| 58, // 7 |
| 58, // 8 |
| 59, // 9 NearMaxPriority |
| |
| 60, // 10 MaxPriority |
| |
| 60 // 11 CriticalPriority |
| }; |
| |
| OSReturn os::set_native_priority(Thread* thread, int newpri) { |
| if (!UseThreadPriorities) return OS_OK; |
| pthread_t thr = thread->osthread()->pthread_id(); |
| int policy = SCHED_OTHER; |
| struct sched_param param; |
| param.sched_priority = newpri; |
| int ret = pthread_setschedparam(thr, policy, ¶m); |
| |
| if (Verbose) { |
| if (ret == 0) { |
| fprintf(stderr, "changed priority of thread %d to %d\n", (int)thr, newpri); |
| } else { |
| fprintf(stderr, "Could not changed priority for thread %d to %d (error %d, %s)\n", |
| (int)thr, newpri, ret, strerror(ret)); |
| } |
| } |
| return (ret == 0) ? OS_OK : OS_ERR; |
| } |
| |
| OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { |
| if (!UseThreadPriorities) { |
| *priority_ptr = java_to_os_priority[NormPriority]; |
| return OS_OK; |
| } |
| pthread_t thr = thread->osthread()->pthread_id(); |
| int policy = SCHED_OTHER; |
| struct sched_param param; |
| int ret = pthread_getschedparam(thr, &policy, ¶m); |
| *priority_ptr = param.sched_priority; |
| |
| return (ret == 0) ? OS_OK : OS_ERR; |
| } |
| |
| // Hint to the underlying OS that a task switch would not be good. |
| // Void return because it's a hint and can fail. |
| void os::hint_no_preempt() {} |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // suspend/resume support |
| |
| // the low-level signal-based suspend/resume support is a remnant from the |
| // old VM-suspension that used to be for java-suspension, safepoints etc, |
| // within hotspot. Now there is a single use-case for this: |
| // - calling get_thread_pc() on the VMThread by the flat-profiler task |
| // that runs in the watcher thread. |
| // The remaining code is greatly simplified from the more general suspension |
| // code that used to be used. |
| // |
| // The protocol is quite simple: |
| // - suspend: |
| // - sends a signal to the target thread |
| // - polls the suspend state of the osthread using a yield loop |
| // - target thread signal handler (SR_handler) sets suspend state |
| // and blocks in sigsuspend until continued |
| // - resume: |
| // - sets target osthread state to continue |
| // - sends signal to end the sigsuspend loop in the SR_handler |
| // |
| // Note that the SR_lock plays no role in this suspend/resume protocol. |
| // |
| |
| static void resume_clear_context(OSThread *osthread) { |
| osthread->set_ucontext(NULL); |
| osthread->set_siginfo(NULL); |
| } |
| |
| static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { |
| osthread->set_ucontext(context); |
| osthread->set_siginfo(siginfo); |
| } |
| |
| // |
| // Handler function invoked when a thread's execution is suspended or |
| // resumed. We have to be careful that only async-safe functions are |
| // called here (Note: most pthread functions are not async safe and |
| // should be avoided.) |
| // |
| // Note: sigwait() is a more natural fit than sigsuspend() from an |
| // interface point of view, but sigwait() prevents the signal hander |
| // from being run. libpthread would get very confused by not having |
| // its signal handlers run and prevents sigwait()'s use with the |
| // mutex granting granting signal. |
| // |
| // Currently only ever called on the VMThread and JavaThreads (PC sampling). |
| // |
| static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { |
| // Save and restore errno to avoid confusing native code with EINTR |
| // after sigsuspend. |
| int old_errno = errno; |
| |
| Thread* thread = Thread::current(); |
| OSThread* osthread = thread->osthread(); |
| assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
| |
| os::SuspendResume::State current = osthread->sr.state(); |
| if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { |
| suspend_save_context(osthread, siginfo, context); |
| |
| // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
| os::SuspendResume::State state = osthread->sr.suspended(); |
| if (state == os::SuspendResume::SR_SUSPENDED) { |
| sigset_t suspend_set; // signals for sigsuspend() |
| |
| // get current set of blocked signals and unblock resume signal |
| pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); |
| sigdelset(&suspend_set, SR_signum); |
| |
| // wait here until we are resumed |
| while (1) { |
| sigsuspend(&suspend_set); |
| |
| os::SuspendResume::State result = osthread->sr.running(); |
| if (result == os::SuspendResume::SR_RUNNING) { |
| break; |
| } |
| } |
| |
| } else if (state == os::SuspendResume::SR_RUNNING) { |
| // request was cancelled, continue |
| } else { |
| ShouldNotReachHere(); |
| } |
| |
| resume_clear_context(osthread); |
| } else if (current == os::SuspendResume::SR_RUNNING) { |
| // request was cancelled, continue |
| } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { |
| // ignore |
| } else { |
| ShouldNotReachHere(); |
| } |
| |
| errno = old_errno; |
| } |
| |
| |
| static int SR_initialize() { |
| struct sigaction act; |
| char *s; |
| // Get signal number to use for suspend/resume |
| if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { |
| int sig = ::strtol(s, 0, 10); |
| if (sig > 0 || sig < NSIG) { |
| SR_signum = sig; |
| } |
| } |
| |
| assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, |
| "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); |
| |
| sigemptyset(&SR_sigset); |
| sigaddset(&SR_sigset, SR_signum); |
| |
| // Set up signal handler for suspend/resume. |
| act.sa_flags = SA_RESTART|SA_SIGINFO; |
| act.sa_handler = (void (*)(int)) SR_handler; |
| |
| // SR_signum is blocked by default. |
| // 4528190 - We also need to block pthread restart signal (32 on all |
| // supported Linux platforms). Note that LinuxThreads need to block |
| // this signal for all threads to work properly. So we don't have |
| // to use hard-coded signal number when setting up the mask. |
| pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); |
| |
| if (sigaction(SR_signum, &act, 0) == -1) { |
| return -1; |
| } |
| |
| // Save signal flag |
| os::Aix::set_our_sigflags(SR_signum, act.sa_flags); |
| return 0; |
| } |
| |
| static int SR_finalize() { |
| return 0; |
| } |
| |
| static int sr_notify(OSThread* osthread) { |
| int status = pthread_kill(osthread->pthread_id(), SR_signum); |
| assert_status(status == 0, status, "pthread_kill"); |
| return status; |
| } |
| |
| // "Randomly" selected value for how long we want to spin |
| // before bailing out on suspending a thread, also how often |
| // we send a signal to a thread we want to resume |
| static const int RANDOMLY_LARGE_INTEGER = 1000000; |
| static const int RANDOMLY_LARGE_INTEGER2 = 100; |
| |
| // returns true on success and false on error - really an error is fatal |
| // but this seems the normal response to library errors |
| static bool do_suspend(OSThread* osthread) { |
| assert(osthread->sr.is_running(), "thread should be running"); |
| // mark as suspended and send signal |
| |
| if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
| // failed to switch, state wasn't running? |
| ShouldNotReachHere(); |
| return false; |
| } |
| |
| if (sr_notify(osthread) != 0) { |
| // try to cancel, switch to running |
| |
| os::SuspendResume::State result = osthread->sr.cancel_suspend(); |
| if (result == os::SuspendResume::SR_RUNNING) { |
| // cancelled |
| return false; |
| } else if (result == os::SuspendResume::SR_SUSPENDED) { |
| // somehow managed to suspend |
| return true; |
| } else { |
| ShouldNotReachHere(); |
| return false; |
| } |
| } |
| |
| // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED |
| |
| for (int n = 0; !osthread->sr.is_suspended(); n++) { |
| for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) { |
| os::naked_yield(); |
| } |
| |
| // timeout, try to cancel the request |
| if (n >= RANDOMLY_LARGE_INTEGER) { |
| os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); |
| if (cancelled == os::SuspendResume::SR_RUNNING) { |
| return false; |
| } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { |
| return true; |
| } else { |
| ShouldNotReachHere(); |
| return false; |
| } |
| } |
| } |
| |
| guarantee(osthread->sr.is_suspended(), "Must be suspended"); |
| return true; |
| } |
| |
| static void do_resume(OSThread* osthread) { |
| //assert(osthread->sr.is_suspended(), "thread should be suspended"); |
| |
| if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { |
| // failed to switch to WAKEUP_REQUEST |
| ShouldNotReachHere(); |
| return; |
| } |
| |
| while (!osthread->sr.is_running()) { |
| if (sr_notify(osthread) == 0) { |
| for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) { |
| for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) { |
| os::naked_yield(); |
| } |
| } |
| } else { |
| ShouldNotReachHere(); |
| } |
| } |
| |
| guarantee(osthread->sr.is_running(), "Must be running!"); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////// |
| // signal handling (except suspend/resume) |
| |
| // This routine may be used by user applications as a "hook" to catch signals. |
| // The user-defined signal handler must pass unrecognized signals to this |
| // routine, and if it returns true (non-zero), then the signal handler must |
| // return immediately. If the flag "abort_if_unrecognized" is true, then this |
| // routine will never retun false (zero), but instead will execute a VM panic |
| // routine kill the process. |
| // |
| // If this routine returns false, it is OK to call it again. This allows |
| // the user-defined signal handler to perform checks either before or after |
| // the VM performs its own checks. Naturally, the user code would be making |
| // a serious error if it tried to handle an exception (such as a null check |
| // or breakpoint) that the VM was generating for its own correct operation. |
| // |
| // This routine may recognize any of the following kinds of signals: |
| // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. |
| // It should be consulted by handlers for any of those signals. |
| // |
| // The caller of this routine must pass in the three arguments supplied |
| // to the function referred to in the "sa_sigaction" (not the "sa_handler") |
| // field of the structure passed to sigaction(). This routine assumes that |
| // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. |
| // |
| // Note that the VM will print warnings if it detects conflicting signal |
| // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". |
| // |
| extern "C" JNIEXPORT int |
| JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); |
| |
| // Set thread signal mask (for some reason on AIX sigthreadmask() seems |
| // to be the thing to call; documentation is not terribly clear about whether |
| // pthread_sigmask also works, and if it does, whether it does the same. |
| bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) { |
| const int rc = ::pthread_sigmask(how, set, oset); |
| // return value semantics differ slightly for error case: |
| // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno |
| // (so, pthread_sigmask is more theadsafe for error handling) |
| // But success is always 0. |
| return rc == 0 ? true : false; |
| } |
| |
| // Function to unblock all signals which are, according |
| // to POSIX, typical program error signals. If they happen while being blocked, |
| // they typically will bring down the process immediately. |
| bool unblock_program_error_signals() { |
| sigset_t set; |
| ::sigemptyset(&set); |
| ::sigaddset(&set, SIGILL); |
| ::sigaddset(&set, SIGBUS); |
| ::sigaddset(&set, SIGFPE); |
| ::sigaddset(&set, SIGSEGV); |
| return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL); |
| } |
| |
| // Renamed from 'signalHandler' to avoid collision with other shared libs. |
| void javaSignalHandler(int sig, siginfo_t* info, void* uc) { |
| assert(info != NULL && uc != NULL, "it must be old kernel"); |
| |
| // Never leave program error signals blocked; |
| // on all our platforms they would bring down the process immediately when |
| // getting raised while being blocked. |
| unblock_program_error_signals(); |
| |
| JVM_handle_aix_signal(sig, info, uc, true); |
| } |
| |
| |
| // This boolean allows users to forward their own non-matching signals |
| // to JVM_handle_aix_signal, harmlessly. |
| bool os::Aix::signal_handlers_are_installed = false; |
| |
| // For signal-chaining |
| struct sigaction os::Aix::sigact[MAXSIGNUM]; |
| unsigned int os::Aix::sigs = 0; |
| bool os::Aix::libjsig_is_loaded = false; |
| typedef struct sigaction *(*get_signal_t)(int); |
| get_signal_t os::Aix::get_signal_action = NULL; |
| |
| struct sigaction* os::Aix::get_chained_signal_action(int sig) { |
| struct sigaction *actp = NULL; |
| |
| if (libjsig_is_loaded) { |
| // Retrieve the old signal handler from libjsig |
| actp = (*get_signal_action)(sig); |
| } |
| if (actp == NULL) { |
| // Retrieve the preinstalled signal handler from jvm |
| actp = get_preinstalled_handler(sig); |
| } |
| |
| return actp; |
| } |
| |
| static bool call_chained_handler(struct sigaction *actp, int sig, |
| siginfo_t *siginfo, void *context) { |
| // Call the old signal handler |
| if (actp->sa_handler == SIG_DFL) { |
| // It's more reasonable to let jvm treat it as an unexpected exception |
| // instead of taking the default action. |
| return false; |
| } else if (actp->sa_handler != SIG_IGN) { |
| if ((actp->sa_flags & SA_NODEFER) == 0) { |
| // automaticlly block the signal |
| sigaddset(&(actp->sa_mask), sig); |
| } |
| |
| sa_handler_t hand = NULL; |
| sa_sigaction_t sa = NULL; |
| bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; |
| // retrieve the chained handler |
| if (siginfo_flag_set) { |
| sa = actp->sa_sigaction; |
| } else { |
| hand = actp->sa_handler; |
| } |
| |
| if ((actp->sa_flags & SA_RESETHAND) != 0) { |
| actp->sa_handler = SIG_DFL; |
| } |
| |
| // try to honor the signal mask |
| sigset_t oset; |
| pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); |
| |
| // call into the chained handler |
| if (siginfo_flag_set) { |
| (*sa)(sig, siginfo, context); |
| } else { |
| (*hand)(sig); |
| } |
| |
| // restore the signal mask |
| pthread_sigmask(SIG_SETMASK, &oset, 0); |
| } |
| // Tell jvm's signal handler the signal is taken care of. |
| return true; |
| } |
| |
| bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) { |
| bool chained = false; |
| // signal-chaining |
| if (UseSignalChaining) { |
| struct sigaction *actp = get_chained_signal_action(sig); |
| if (actp != NULL) { |
| chained = call_chained_handler(actp, sig, siginfo, context); |
| } |
| } |
| return chained; |
| } |
| |
| struct sigaction* os::Aix::get_preinstalled_handler(int sig) { |
| if ((((unsigned int)1 << sig) & sigs) != 0) { |
| return &sigact[sig]; |
| } |
| return NULL; |
| } |
| |
| void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) { |
| assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); |
| sigact[sig] = oldAct; |
| sigs |= (unsigned int)1 << sig; |
| } |
| |
| // for diagnostic |
| int os::Aix::sigflags[MAXSIGNUM]; |
| |
| int os::Aix::get_our_sigflags(int sig) { |
| assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); |
| return sigflags[sig]; |
| } |
| |
| void os::Aix::set_our_sigflags(int sig, int flags) { |
| assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); |
| sigflags[sig] = flags; |
| } |
| |
| void os::Aix::set_signal_handler(int sig, bool set_installed) { |
| // Check for overwrite. |
| struct sigaction oldAct; |
| sigaction(sig, (struct sigaction*)NULL, &oldAct); |
| |
| void* oldhand = oldAct.sa_sigaction |
| ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) |
| : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); |
| // Renamed 'signalHandler' to avoid collision with other shared libs. |
| if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && |
| oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && |
| oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) { |
| if (AllowUserSignalHandlers || !set_installed) { |
| // Do not overwrite; user takes responsibility to forward to us. |
| return; |
| } else if (UseSignalChaining) { |
| // save the old handler in jvm |
| save_preinstalled_handler(sig, oldAct); |
| // libjsig also interposes the sigaction() call below and saves the |
| // old sigaction on it own. |
| } else { |
| fatal(err_msg("Encountered unexpected pre-existing sigaction handler " |
| "%#lx for signal %d.", (long)oldhand, sig)); |
| } |
| } |
| |
| struct sigaction sigAct; |
| sigfillset(&(sigAct.sa_mask)); |
| if (!set_installed) { |
| sigAct.sa_handler = SIG_DFL; |
| sigAct.sa_flags = SA_RESTART; |
| } else { |
| // Renamed 'signalHandler' to avoid collision with other shared libs. |
| sigAct.sa_sigaction = javaSignalHandler; |
| sigAct.sa_flags = SA_SIGINFO|SA_RESTART; |
| } |
| // Save flags, which are set by ours |
| assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); |
| sigflags[sig] = sigAct.sa_flags; |
| |
| int ret = sigaction(sig, &sigAct, &oldAct); |
| assert(ret == 0, "check"); |
| |
| void* oldhand2 = oldAct.sa_sigaction |
| ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) |
| : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); |
| assert(oldhand2 == oldhand, "no concurrent signal handler installation"); |
| } |
| |
| // install signal handlers for signals that HotSpot needs to |
| // handle in order to support Java-level exception handling. |
| void os::Aix::install_signal_handlers() { |
| if (!signal_handlers_are_installed) { |
| signal_handlers_are_installed = true; |
| |
| // signal-chaining |
| typedef void (*signal_setting_t)(); |
| signal_setting_t begin_signal_setting = NULL; |
| signal_setting_t end_signal_setting = NULL; |
| begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, |
| dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); |
| if (begin_signal_setting != NULL) { |
| end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, |
| dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); |
| get_signal_action = CAST_TO_FN_PTR(get_signal_t, |
| dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); |
| libjsig_is_loaded = true; |
| assert(UseSignalChaining, "should enable signal-chaining"); |
| } |
| if (libjsig_is_loaded) { |
| // Tell libjsig jvm is setting signal handlers |
| (*begin_signal_setting)(); |
| } |
| |
| set_signal_handler(SIGSEGV, true); |
| set_signal_handler(SIGPIPE, true); |
| set_signal_handler(SIGBUS, true); |
| set_signal_handler(SIGILL, true); |
| set_signal_handler(SIGFPE, true); |
| set_signal_handler(SIGTRAP, true); |
| set_signal_handler(SIGXFSZ, true); |
| set_signal_handler(SIGDANGER, true); |
| |
| if (libjsig_is_loaded) { |
| // Tell libjsig jvm finishes setting signal handlers |
| (*end_signal_setting)(); |
| } |
| |
| // We don't activate signal checker if libjsig is in place, we trust ourselves |
| // and if UserSignalHandler is installed all bets are off. |
| // Log that signal checking is off only if -verbose:jni is specified. |
| if (CheckJNICalls) { |
| if (libjsig_is_loaded) { |
| tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
| check_signals = false; |
| } |
| if (AllowUserSignalHandlers) { |
| tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
| check_signals = false; |
| } |
| // need to initialize check_signal_done |
| ::sigemptyset(&check_signal_done); |
| } |
| } |
| } |
| |
| static const char* get_signal_handler_name(address handler, |
| char* buf, int buflen) { |
| int offset; |
| bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); |
| if (found) { |
| // skip directory names |
| const char *p1, *p2; |
| p1 = buf; |
| size_t len = strlen(os::file_separator()); |
| while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; |
| // The way os::dll_address_to_library_name is implemented on Aix |
| // right now, it always returns -1 for the offset which is not |
| // terribly informative. |
| // Will fix that. For now, omit the offset. |
| jio_snprintf(buf, buflen, "%s", p1); |
| } else { |
| jio_snprintf(buf, buflen, PTR_FORMAT, handler); |
| } |
| return buf; |
| } |
| |
| static void print_signal_handler(outputStream* st, int sig, |
| char* buf, size_t buflen) { |
| struct sigaction sa; |
| sigaction(sig, NULL, &sa); |
| |
| st->print("%s: ", os::exception_name(sig, buf, buflen)); |
| |
| address handler = (sa.sa_flags & SA_SIGINFO) |
| ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) |
| : CAST_FROM_FN_PTR(address, sa.sa_handler); |
| |
| if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { |
| st->print("SIG_DFL"); |
| } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { |
| st->print("SIG_IGN"); |
| } else { |
| st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); |
| } |
| |
| // Print readable mask. |
| st->print(", sa_mask[0]="); |
| os::Posix::print_signal_set_short(st, &sa.sa_mask); |
| |
| address rh = VMError::get_resetted_sighandler(sig); |
| // May be, handler was resetted by VMError? |
| if (rh != NULL) { |
| handler = rh; |
| sa.sa_flags = VMError::get_resetted_sigflags(sig); |
| } |
| |
| // Print textual representation of sa_flags. |
| st->print(", sa_flags="); |
| os::Posix::print_sa_flags(st, sa.sa_flags); |
| |
| // Check: is it our handler? |
| if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) || |
| handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { |
| // It is our signal handler. |
| // Check for flags, reset system-used one! |
| if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) { |
| st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library", |
| os::Aix::get_our_sigflags(sig)); |
| } |
| } |
| st->cr(); |
| } |
| |
| |
| #define DO_SIGNAL_CHECK(sig) \ |
| if (!sigismember(&check_signal_done, sig)) \ |
| os::Aix::check_signal_handler(sig) |
| |
| // This method is a periodic task to check for misbehaving JNI applications |
| // under CheckJNI, we can add any periodic checks here |
| |
| void os::run_periodic_checks() { |
| |
| if (check_signals == false) return; |
| |
| // SEGV and BUS if overridden could potentially prevent |
| // generation of hs*.log in the event of a crash, debugging |
| // such a case can be very challenging, so we absolutely |
| // check the following for a good measure: |
| DO_SIGNAL_CHECK(SIGSEGV); |
| DO_SIGNAL_CHECK(SIGILL); |
| DO_SIGNAL_CHECK(SIGFPE); |
| DO_SIGNAL_CHECK(SIGBUS); |
| DO_SIGNAL_CHECK(SIGPIPE); |
| DO_SIGNAL_CHECK(SIGXFSZ); |
| if (UseSIGTRAP) { |
| DO_SIGNAL_CHECK(SIGTRAP); |
| } |
| DO_SIGNAL_CHECK(SIGDANGER); |
| |
| // ReduceSignalUsage allows the user to override these handlers |
| // see comments at the very top and jvm_solaris.h |
| if (!ReduceSignalUsage) { |
| DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); |
| DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); |
| DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); |
| DO_SIGNAL_CHECK(BREAK_SIGNAL); |
| } |
| |
| DO_SIGNAL_CHECK(SR_signum); |
| DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); |
| } |
| |
| typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); |
| |
| static os_sigaction_t os_sigaction = NULL; |
| |
| void os::Aix::check_signal_handler(int sig) { |
| char buf[O_BUFLEN]; |
| address jvmHandler = NULL; |
| |
| struct sigaction act; |
| if (os_sigaction == NULL) { |
| // only trust the default sigaction, in case it has been interposed |
| os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); |
| if (os_sigaction == NULL) return; |
| } |
| |
| os_sigaction(sig, (struct sigaction*)NULL, &act); |
| |
| address thisHandler = (act.sa_flags & SA_SIGINFO) |
| ? CAST_FROM_FN_PTR(address, act.sa_sigaction) |
| : CAST_FROM_FN_PTR(address, act.sa_handler); |
| |
| |
| switch(sig) { |
| case SIGSEGV: |
| case SIGBUS: |
| case SIGFPE: |
| case SIGPIPE: |
| case SIGILL: |
| case SIGXFSZ: |
| // Renamed 'signalHandler' to avoid collision with other shared libs. |
| jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler); |
| break; |
| |
| case SHUTDOWN1_SIGNAL: |
| case SHUTDOWN2_SIGNAL: |
| case SHUTDOWN3_SIGNAL: |
| case BREAK_SIGNAL: |
| jvmHandler = (address)user_handler(); |
| break; |
| |
| case INTERRUPT_SIGNAL: |
| jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); |
| break; |
| |
| default: |
| if (sig == SR_signum) { |
| jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); |
| } else { |
| return; |
| } |
| break; |
| } |
| |
| if (thisHandler != jvmHandler) { |
| tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); |
| tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); |
| tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); |
| // No need to check this sig any longer |
| sigaddset(&check_signal_done, sig); |
| // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN |
| if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { |
| tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", |
| exception_name(sig, buf, O_BUFLEN)); |
| } |
| } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) { |
| tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); |
| tty->print("expected:" PTR32_FORMAT, os::Aix::get_our_sigflags(sig)); |
| tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); |
| // No need to check this sig any longer |
| sigaddset(&check_signal_done, sig); |
| } |
| |
| // Dump all the signal |
| if (sigismember(&check_signal_done, sig)) { |
| print_signal_handlers(tty, buf, O_BUFLEN); |
| } |
| } |
| |
| extern bool signal_name(int signo, char* buf, size_t len); |
| |
| const char* os::exception_name(int exception_code, char* buf, size_t size) { |
| if (0 < exception_code && exception_code <= SIGRTMAX) { |
| // signal |
| if (!signal_name(exception_code, buf, size)) { |
| jio_snprintf(buf, size, "SIG%d", exception_code); |
| } |
| return buf; |
| } else { |
| return NULL; |
| } |
| } |
| |
| // To install functions for atexit system call |
| extern "C" { |
| static void perfMemory_exit_helper() { |
| perfMemory_exit(); |
| } |
| } |
| |
| // This is called _before_ the most of global arguments have been parsed. |
| void os::init(void) { |
| // This is basic, we want to know if that ever changes. |
| // (shared memory boundary is supposed to be a 256M aligned) |
| assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected"); |
| |
| // First off, we need to know whether we run on AIX or PASE, and |
| // the OS level we run on. |
| os::Aix::initialize_os_info(); |
| |
| // Scan environment (SPEC1170 behaviour, etc) |
| os::Aix::scan_environment(); |
| |
| // Check which pages are supported by AIX. |
| os::Aix::query_multipage_support(); |
| |
| // Next, we need to initialize libo4 and libperfstat libraries. |
| if (os::Aix::on_pase()) { |
| os::Aix::initialize_libo4(); |
| } else { |
| os::Aix::initialize_libperfstat(); |
| } |
| |
| // Reset the perfstat information provided by ODM. |
| if (os::Aix::on_aix()) { |
| libperfstat::perfstat_reset(); |
| } |
| |
| // Now initialze basic system properties. Note that for some of the values we |
| // need libperfstat etc. |
| os::Aix::initialize_system_info(); |
| |
| // Initialize large page support. |
| if (UseLargePages) { |
| os::large_page_init(); |
| if (!UseLargePages) { |
| // initialize os::_page_sizes |
| _page_sizes[0] = Aix::page_size(); |
| _page_sizes[1] = 0; |
| if (Verbose) { |
| fprintf(stderr, "Large Page initialization failed: setting UseLargePages=0.\n"); |
| } |
| } |
| } else { |
| // initialize os::_page_sizes |
| _page_sizes[0] = Aix::page_size(); |
| _page_sizes[1] = 0; |
| } |
| |
| // debug trace |
| if (Verbose) { |
| fprintf(stderr, "os::vm_page_size 0x%llX\n", os::vm_page_size()); |
| fprintf(stderr, "os::large_page_size 0x%llX\n", os::large_page_size()); |
| fprintf(stderr, "os::_page_sizes = ( "); |
| for (int i = 0; _page_sizes[i]; i ++) { |
| fprintf(stderr, " %s ", describe_pagesize(_page_sizes[i])); |
| } |
| fprintf(stderr, ")\n"); |
| } |
| |
| _initial_pid = getpid(); |
| |
| clock_tics_per_sec = sysconf(_SC_CLK_TCK); |
| |
| init_random(1234567); |
| |
| ThreadCritical::initialize(); |
| |
| // Main_thread points to the aboriginal thread. |
| Aix::_main_thread = pthread_self(); |
| |
| initial_time_count = os::elapsed_counter(); |
| pthread_mutex_init(&dl_mutex, NULL); |
| } |
| |
| // this is called _after_ the global arguments have been parsed |
| jint os::init_2(void) { |
| |
| if (Verbose) { |
| fprintf(stderr, "processor count: %d\n", os::_processor_count); |
| fprintf(stderr, "physical memory: %lu\n", Aix::_physical_memory); |
| } |
| |
| // initially build up the loaded dll map |
| LoadedLibraries::reload(); |
| |
| const int page_size = Aix::page_size(); |
| const int map_size = page_size; |
| |
| address map_address = (address) MAP_FAILED; |
| const int prot = PROT_READ; |
| const int flags = MAP_PRIVATE|MAP_ANONYMOUS; |
| |
| // use optimized addresses for the polling page, |
| // e.g. map it to a special 32-bit address. |
| if (OptimizePollingPageLocation) { |
| // architecture-specific list of address wishes: |
| address address_wishes[] = { |
| // AIX: addresses lower than 0x30000000 don't seem to work on AIX. |
| // PPC64: all address wishes are non-negative 32 bit values where |
| // the lower 16 bits are all zero. we can load these addresses |
| // with a single ppc_lis instruction. |
| (address) 0x30000000, (address) 0x31000000, |
| (address) 0x32000000, (address) 0x33000000, |
| (address) 0x40000000, (address) 0x41000000, |
| (address) 0x42000000, (address) 0x43000000, |
| (address) 0x50000000, (address) 0x51000000, |
| (address) 0x52000000, (address) 0x53000000, |
| (address) 0x60000000, (address) 0x61000000, |
| (address) 0x62000000, (address) 0x63000000 |
| }; |
| int address_wishes_length = sizeof(address_wishes)/sizeof(address); |
| |
| // iterate over the list of address wishes: |
| for (int i=0; i<address_wishes_length; i++) { |
| // try to map with current address wish. |
| // AIX: AIX needs MAP_FIXED if we provide an address and mmap will |
| // fail if the address is already mapped. |
| map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size, |
| map_size, prot, |
| flags | MAP_FIXED, |
| -1, 0); |
| if (Verbose) { |
| fprintf(stderr, "SafePoint Polling Page address: %p (wish) => %p\n", |
| address_wishes[i], map_address + (ssize_t)page_size); |
| } |
| |
| if (map_address + (ssize_t)page_size == address_wishes[i]) { |
| // map succeeded and map_address is at wished address, exit loop. |
| break; |
| } |
| |
| if (map_address != (address) MAP_FAILED) { |
| // map succeeded, but polling_page is not at wished address, unmap and continue. |
| ::munmap(map_address, map_size); |
| map_address = (address) MAP_FAILED; |
| } |
| // map failed, continue loop. |
| } |
| } // end OptimizePollingPageLocation |
| |
| if (map_address == (address) MAP_FAILED) { |
| map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0); |
| } |
| guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page"); |
| os::set_polling_page(map_address); |
| |
| if (!UseMembar) { |
| address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
| guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page"); |
| os::set_memory_serialize_page(mem_serialize_page); |
| |
| #ifndef PRODUCT |
| if (Verbose && PrintMiscellaneous) |
| tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); |
| #endif |
| } |
| |
| // initialize suspend/resume support - must do this before signal_sets_init() |
| if (SR_initialize() != 0) { |
| perror("SR_initialize failed"); |
| return JNI_ERR; |
| } |
| |
| Aix::signal_sets_init(); |
| Aix::install_signal_handlers(); |
| |
| // Check minimum allowable stack size for thread creation and to initialize |
| // the java system classes, including StackOverflowError - depends on page |
| // size. Add a page for compiler2 recursion in main thread. |
| // Add in 2*BytesPerWord times page size to account for VM stack during |
| // class initialization depending on 32 or 64 bit VM. |
| os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed, |
| (size_t)(StackYellowPages+StackRedPages+StackShadowPages + |
| 2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::page_size()); |
| |
| size_t threadStackSizeInBytes = ThreadStackSize * K; |
| if (threadStackSizeInBytes != 0 && |
| threadStackSizeInBytes < os::Aix::min_stack_allowed) { |
| tty->print_cr("\nThe stack size specified is too small, " |
| "Specify at least %dk", |
| os::Aix::min_stack_allowed / K); |
| return JNI_ERR; |
| } |
| |
| // Make the stack size a multiple of the page size so that |
| // the yellow/red zones can be guarded. |
| // note that this can be 0, if no default stacksize was set |
| JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size())); |
| |
| Aix::libpthread_init(); |
| |
| if (MaxFDLimit) { |
| // set the number of file descriptors to max. print out error |
| // if getrlimit/setrlimit fails but continue regardless. |
| struct rlimit nbr_files; |
| int status = getrlimit(RLIMIT_NOFILE, &nbr_files); |
| if (status != 0) { |
| if (PrintMiscellaneous && (Verbose || WizardMode)) |
| perror("os::init_2 getrlimit failed"); |
| } else { |
| nbr_files.rlim_cur = nbr_files.rlim_max; |
| status = setrlimit(RLIMIT_NOFILE, &nbr_files); |
| if (status != 0) { |
| if (PrintMiscellaneous && (Verbose || WizardMode)) |
| perror("os::init_2 setrlimit failed"); |
| } |
| } |
| } |
| |
| if (PerfAllowAtExitRegistration) { |
| // only register atexit functions if PerfAllowAtExitRegistration is set. |
| // atexit functions can be delayed until process exit time, which |
| // can be problematic for embedded VM situations. Embedded VMs should |
| // call DestroyJavaVM() to assure that VM resources are released. |
| |
| // note: perfMemory_exit_helper atexit function may be removed in |
| // the future if the appropriate cleanup code can be added to the |
| // VM_Exit VMOperation's doit method. |
| if (atexit(perfMemory_exit_helper) != 0) { |
| warning("os::init_2 atexit(perfMemory_exit_helper) failed"); |
| } |
| } |
| |
| return JNI_OK; |
| } |
| |
| // this is called at the end of vm_initialization |
| void os::init_3(void) { |
| return; |
| } |
| |
| // Mark the polling page as unreadable |
| void os::make_polling_page_unreadable(void) { |
| if (!guard_memory((char*)_polling_page, Aix::page_size())) { |
| fatal("Could not disable polling page"); |
| } |
| }; |
| |
| // Mark the polling page as readable |
| void os::make_polling_page_readable(void) { |
| // Changed according to os_linux.cpp. |
| if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) { |
| fatal(err_msg("Could not enable polling page at " PTR_FORMAT, _polling_page)); |
| } |
| }; |
| |
| int os::active_processor_count() { |
| int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); |
| assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); |
| return online_cpus; |
| } |
| |
| void os::set_native_thread_name(const char *name) { |
| // Not yet implemented. |
| return; |
| } |
| |
| bool os::distribute_processes(uint length, uint* distribution) { |
| // Not yet implemented. |
| return false; |
| } |
| |
| bool os::bind_to_processor(uint processor_id) { |
| // Not yet implemented. |
| return false; |
| } |
| |
| void os::SuspendedThreadTask::internal_do_task() { |
| if (do_suspend(_thread->osthread())) { |
| SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); |
| do_task(context); |
| do_resume(_thread->osthread()); |
| } |
| } |
| |
| class PcFetcher : public os::SuspendedThreadTask { |
| public: |
| PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} |
| ExtendedPC result(); |
| protected: |
| void do_task(const os::SuspendedThreadTaskContext& context); |
| private: |
| ExtendedPC _epc; |
| }; |
| |
| ExtendedPC PcFetcher::result() { |
| guarantee(is_done(), "task is not done yet."); |
| return _epc; |
| } |
| |
| void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { |
| Thread* thread = context.thread(); |
| OSThread* osthread = thread->osthread(); |
| if (osthread->ucontext() != NULL) { |
| _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext()); |
| } else { |
| // NULL context is unexpected, double-check this is the VMThread. |
| guarantee(thread->is_VM_thread(), "can only be called for VMThread"); |
| } |
| } |
| |
| // Suspends the target using the signal mechanism and then grabs the PC before |
| // resuming the target. Used by the flat-profiler only |
| ExtendedPC os::get_thread_pc(Thread* thread) { |
| // Make sure that it is called by the watcher for the VMThread. |
| assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); |
| assert(thread->is_VM_thread(), "Can only be called for VMThread"); |
| |
| PcFetcher fetcher(thread); |
| fetcher.run(); |
| return fetcher.result(); |
| } |
| |
| // Not neede on Aix. |
| // int os::Aix::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) { |
| // } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // debug support |
| |
| static address same_page(address x, address y) { |
| intptr_t page_bits = -os::vm_page_size(); |
| if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) |
| return x; |
| else if (x > y) |
| return (address)(intptr_t(y) | ~page_bits) + 1; |
| else |
| return (address)(intptr_t(y) & page_bits); |
| } |
| |
| bool os::find(address addr, outputStream* st) { |
| |
| st->print(PTR_FORMAT ": ", addr); |
| |
| const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr); |
| if (lib) { |
| lib->print(st); |
| return true; |
| } else { |
| lib = LoadedLibraries::find_for_data_address(addr); |
| if (lib) { |
| lib->print(st); |
| return true; |
| } else { |
| st->print_cr("(outside any module)"); |
| } |
| } |
| |
| return false; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // misc |
| |
| // This does not do anything on Aix. This is basically a hook for being |
| // able to use structured exception handling (thread-local exception filters) |
| // on, e.g., Win32. |
| void |
| os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, |
| JavaCallArguments* args, Thread* thread) { |
| f(value, method, args, thread); |
| } |
| |
| void os::print_statistics() { |
| } |
| |
| int os::message_box(const char* title, const char* message) { |
| int i; |
| fdStream err(defaultStream::error_fd()); |
| for (i = 0; i < 78; i++) err.print_raw("="); |
| err.cr(); |
| err.print_raw_cr(title); |
| for (i = 0; i < 78; i++) err.print_raw("-"); |
| err.cr(); |
| err.print_raw_cr(message); |
| for (i = 0; i < 78; i++) err.print_raw("="); |
| err.cr(); |
| |
| char buf[16]; |
| // Prevent process from exiting upon "read error" without consuming all CPU |
| while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } |
| |
| return buf[0] == 'y' || buf[0] == 'Y'; |
| } |
| |
| int os::stat(const char *path, struct stat *sbuf) { |
| char pathbuf[MAX_PATH]; |
| if (strlen(path) > MAX_PATH - 1) { |
| errno = ENAMETOOLONG; |
| return -1; |
| } |
| os::native_path(strcpy(pathbuf, path)); |
| return ::stat(pathbuf, sbuf); |
| } |
| |
| bool os::check_heap(bool force) { |
| return true; |
| } |
| |
| // int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { |
| // return ::vsnprintf(buf, count, format, args); |
| // } |
| |
| // Is a (classpath) directory empty? |
| bool os::dir_is_empty(const char* path) { |
| DIR *dir = NULL; |
| struct dirent *ptr; |
| |
| dir = opendir(path); |
| if (dir == NULL) return true; |
| |
| /* Scan the directory */ |
| bool result = true; |
| char buf[sizeof(struct dirent) + MAX_PATH]; |
| while (result && (ptr = ::readdir(dir)) != NULL) { |
| if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { |
| result = false; |
| } |
| } |
| closedir(dir); |
| return result; |
| } |
| |
| // This code originates from JDK's sysOpen and open64_w |
| // from src/solaris/hpi/src/system_md.c |
| |
| #ifndef O_DELETE |
| #define O_DELETE 0x10000 |
| #endif |
| |
| // Open a file. Unlink the file immediately after open returns |
| // if the specified oflag has the O_DELETE flag set. |
| // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c |
| |
| int os::open(const char *path, int oflag, int mode) { |
| |
| if (strlen(path) > MAX_PATH - 1) { |
| errno = ENAMETOOLONG; |
| return -1; |
| } |
| int fd; |
| int o_delete = (oflag & O_DELETE); |
| oflag = oflag & ~O_DELETE; |
| |
| fd = ::open64(path, oflag, mode); |
| if (fd == -1) return -1; |
| |
| // If the open succeeded, the file might still be a directory. |
| { |
| struct stat64 buf64; |
| int ret = ::fstat64(fd, &buf64); |
| int st_mode = buf64.st_mode; |
| |
| if (ret != -1) { |
| if ((st_mode & S_IFMT) == S_IFDIR) { |
| errno = EISDIR; |
| ::close(fd); |
| return -1; |
| } |
| } else { |
| ::close(fd); |
| return -1; |
| } |
| } |
| |
| // All file descriptors that are opened in the JVM and not |
| // specifically destined for a subprocess should have the |
| // close-on-exec flag set. If we don't set it, then careless 3rd |
| // party native code might fork and exec without closing all |
| // appropriate file descriptors (e.g. as we do in closeDescriptors in |
| // UNIXProcess.c), and this in turn might: |
| // |
| // - cause end-of-file to fail to be detected on some file |
| // descriptors, resulting in mysterious hangs, or |
| // |
| // - might cause an fopen in the subprocess to fail on a system |
| // suffering from bug 1085341. |
| // |
| // (Yes, the default setting of the close-on-exec flag is a Unix |
| // design flaw.) |
| // |
| // See: |
| // 1085341: 32-bit stdio routines should support file descriptors >255 |
| // 4843136: (process) pipe file descriptor from Runtime.exec not being closed |
| // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 |
| #ifdef FD_CLOEXEC |
| { |
| int flags = ::fcntl(fd, F_GETFD); |
| if (flags != -1) |
| ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
| } |
| #endif |
| |
| if (o_delete != 0) { |
| ::unlink(path); |
| } |
| return fd; |
| } |
| |
| |
| // create binary file, rewriting existing file if required |
| int os::create_binary_file(const char* path, bool rewrite_existing) { |
| int oflags = O_WRONLY | O_CREAT; |
| if (!rewrite_existing) { |
| oflags |= O_EXCL; |
| } |
| return ::open64(path, oflags, S_IREAD | S_IWRITE); |
| } |
| |
| // return current position of file pointer |
| jlong os::current_file_offset(int fd) { |
| return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); |
| } |
| |
| // move file pointer to the specified offset |
| jlong os::seek_to_file_offset(int fd, jlong offset) { |
| return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); |
| } |
| |
| // This code originates from JDK's sysAvailable |
| // from src/solaris/hpi/src/native_threads/src/sys_api_td.c |
| |
| int os::available(int fd, jlong *bytes) { |
| jlong cur, end; |
| int mode; |
| struct stat64 buf64; |
| |
| if (::fstat64(fd, &buf64) >= 0) { |
| mode = buf64.st_mode; |
| if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
| // XXX: is the following call interruptible? If so, this might |
| // need to go through the INTERRUPT_IO() wrapper as for other |
| // blocking, interruptible calls in this file. |
| int n; |
| if (::ioctl(fd, FIONREAD, &n) >= 0) { |
| *bytes = n; |
| return 1; |
| } |
| } |
| } |
| if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { |
| return 0; |
| } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { |
| return 0; |
| } else if (::lseek64(fd, cur, SEEK_SET) == -1) { |
| return 0; |
| } |
| *bytes = end - cur; |
| return 1; |
| } |
| |
| int os::socket_available(int fd, jint *pbytes) { |
| // Linux doc says EINTR not returned, unlike Solaris |
| int ret = ::ioctl(fd, FIONREAD, pbytes); |
| |
| //%% note ioctl can return 0 when successful, JVM_SocketAvailable |
| // is expected to return 0 on failure and 1 on success to the jdk. |
| return (ret < 0) ? 0 : 1; |
| } |
| |
| // Map a block of memory. |
| char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
| char *addr, size_t bytes, bool read_only, |
| bool allow_exec) { |
| Unimplemented(); |
| return NULL; |
| } |
| |
| |
| // Remap a block of memory. |
| char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
| char *addr, size_t bytes, bool read_only, |
| bool allow_exec) { |
| // same as map_memory() on this OS |
| return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, |
| allow_exec); |
| } |
| |
| // Unmap a block of memory. |
| bool os::pd_unmap_memory(char* addr, size_t bytes) { |
| return munmap(addr, bytes) == 0; |
| } |
| |
| // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) |
| // are used by JVM M&M and JVMTI to get user+sys or user CPU time |
| // of a thread. |
| // |
| // current_thread_cpu_time() and thread_cpu_time(Thread*) returns |
| // the fast estimate available on the platform. |
| |
| jlong os::current_thread_cpu_time() { |
| // return user + sys since the cost is the same |
| const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */); |
| assert(n >= 0, "negative CPU time"); |
| return n; |
| } |
| |
| jlong os::thread_cpu_time(Thread* thread) { |
| // consistent with what current_thread_cpu_time() returns |
| const jlong n = os::thread_cpu_time(thread, true /* user + sys */); |
| assert(n >= 0, "negative CPU time"); |
| return n; |
| } |
| |
| jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { |
| const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time); |
| assert(n >= 0, "negative CPU time"); |
| return n; |
| } |
| |
| static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) { |
| bool error = false; |
| |
| jlong sys_time = 0; |
| jlong user_time = 0; |
| |
| // reimplemented using getthrds64(). |
| // |
| // goes like this: |
| // For the thread in question, get the kernel thread id. Then get the |
| // kernel thread statistics using that id. |
| // |
| // This only works of course when no pthread scheduling is used, |
| // ie there is a 1:1 relationship to kernel threads. |
| // On AIX, see AIXTHREAD_SCOPE variable. |
| |
| pthread_t pthtid = thread->osthread()->pthread_id(); |
| |
| // retrieve kernel thread id for the pthread: |
| tid64_t tid = 0; |
| struct __pthrdsinfo pinfo; |
| // I just love those otherworldly IBM APIs which force me to hand down |
| // dummy buffers for stuff I dont care for... |
| char dummy[1]; |
| int dummy_size = sizeof(dummy); |
| if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo), |
| dummy, &dummy_size) == 0) { |
| tid = pinfo.__pi_tid; |
| } else { |
| tty->print_cr("pthread_getthrds_np failed."); |
| error = true; |
| } |
| |
| // retrieve kernel timing info for that kernel thread |
| if (!error) { |
| struct thrdentry64 thrdentry; |
| if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) { |
| sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL; |
| user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL; |
| } else { |
| tty->print_cr("pthread_getthrds_np failed."); |
| error = true; |
| } |
| } |
| |
| if (p_sys_time) { |
| *p_sys_time = sys_time; |
| } |
| |
| if (p_user_time) { |
| *p_user_time = user_time; |
| } |
| |
| if (error) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { |
| jlong sys_time; |
| jlong user_time; |
| |
| if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) { |
| return -1; |
| } |
| |
| return user_sys_cpu_time ? sys_time + user_time : user_time; |
| } |
| |
| void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { |
| info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits |
| info_ptr->may_skip_backward = false; // elapsed time not wall time |
| info_ptr->may_skip_forward = false; // elapsed time not wall time |
| info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned |
| } |
| |
| void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { |
| info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits |
| info_ptr->may_skip_backward = false; // elapsed time not wall time |
| info_ptr->may_skip_forward = false; // elapsed time not wall time |
| info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned |
| } |
| |
| bool os::is_thread_cpu_time_supported() { |
| return true; |
| } |
| |
| // System loadavg support. Returns -1 if load average cannot be obtained. |
| // For now just return the system wide load average (no processor sets). |
| int os::loadavg(double values[], int nelem) { |
| |
| // Implemented using libperfstat on AIX. |
| |
| guarantee(nelem >= 0 && nelem <= 3, "argument error"); |
| guarantee(values, "argument error"); |
| |
| if (os::Aix::on_pase()) { |
| Unimplemented(); |
| return -1; |
| } else { |
| // AIX: use libperfstat |
| // |
| // See also: |
| // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm |
| // /usr/include/libperfstat.h: |
| |
| // Use the already AIX version independent get_cpuinfo. |
| os::Aix::cpuinfo_t ci; |
| if (os::Aix::get_cpuinfo(&ci)) { |
| for (int i = 0; i < nelem; i++) { |
| values[i] = ci.loadavg[i]; |
| } |
| } else { |
| return -1; |
| } |
| return nelem; |
| } |
| } |
| |
| void os::pause() { |
| char filename[MAX_PATH]; |
| if (PauseAtStartupFile && PauseAtStartupFile[0]) { |
| jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); |
| } else { |
| jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); |
| } |
| |
| int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); |
| if (fd != -1) { |
| struct stat buf; |
| ::close(fd); |
| while (::stat(filename, &buf) == 0) { |
| (void)::poll(NULL, 0, 100); |
| } |
| } else { |
| jio_fprintf(stderr, |
| "Could not open pause file '%s', continuing immediately.\n", filename); |
| } |
| } |
| |
| bool os::Aix::is_primordial_thread() { |
| if (pthread_self() == (pthread_t)1) { |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| // OS recognitions (PASE/AIX, OS level) call this before calling any |
| // one of Aix::on_pase(), Aix::os_version() static |
| void os::Aix::initialize_os_info() { |
| |
| assert(_on_pase == -1 && _os_version == -1, "already called."); |
| |
| struct utsname uts; |
| memset(&uts, 0, sizeof(uts)); |
| strcpy(uts.sysname, "?"); |
| if (::uname(&uts) == -1) { |
| fprintf(stderr, "uname failed (%d)\n", errno); |
| guarantee(0, "Could not determine whether we run on AIX or PASE"); |
| } else { |
| if (Verbose) { |
| fprintf(stderr,"uname says: sysname \"%s\" version \"%s\" release \"%s\" " |
| "node \"%s\" machine \"%s\"\n", |
| uts.sysname, uts.version, uts.release, uts.nodename, uts.machine); |
| } |
| const int major = atoi(uts.version); |
| assert(major > 0, "invalid OS version"); |
| const int minor = atoi(uts.release); |
| assert(minor > 0, "invalid OS release"); |
| _os_version = (major << 8) | minor; |
| if (strcmp(uts.sysname, "OS400") == 0) { |
| Unimplemented(); |
| } else if (strcmp(uts.sysname, "AIX") == 0) { |
| // We run on AIX. We do not support versions older than AIX 5.3. |
| _on_pase = 0; |
| if (_os_version < 0x0503) { |
| fprintf(stderr, "AIX release older than AIX 5.3 not supported.\n"); |
| assert(false, "AIX release too old."); |
| } else { |
| if (Verbose) { |
| fprintf(stderr, "We run on AIX %d.%d\n", major, minor); |
| } |
| } |
| } else { |
| assert(false, "unknown OS"); |
| } |
| } |
| |
| guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release"); |
| |
| } // end: os::Aix::initialize_os_info() |
| |
| // Scan environment for important settings which might effect the VM. |
| // Trace out settings. Warn about invalid settings and/or correct them. |
| // |
| // Must run after os::Aix::initialue_os_info(). |
| void os::Aix::scan_environment() { |
| |
| char* p; |
| int rc; |
| |
| // Warn explicity if EXTSHM=ON is used. That switch changes how |
| // System V shared memory behaves. One effect is that page size of |
| // shared memory cannot be change dynamically, effectivly preventing |
| // large pages from working. |
| // This switch was needed on AIX 32bit, but on AIX 64bit the general |
| // recommendation is (in OSS notes) to switch it off. |
| p = ::getenv("EXTSHM"); |
| if (Verbose) { |
| fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>"); |
| } |
| if (p && strcmp(p, "ON") == 0) { |
| fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n"); |
| _extshm = 1; |
| } else { |
| _extshm = 0; |
| } |
| |
| // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs. |
| // Not tested, not supported. |
| // |
| // Note that it might be worth the trouble to test and to require it, if only to |
| // get useful return codes for mprotect. |
| // |
| // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before |
| // exec() ? before loading the libjvm ? ....) |
| p = ::getenv("XPG_SUS_ENV"); |
| if (Verbose) { |
| fprintf(stderr, "XPG_SUS_ENV=%s.\n", p ? p : "<unset>"); |
| } |
| if (p && strcmp(p, "ON") == 0) { |
| _xpg_sus_mode = 1; |
| fprintf(stderr, "Unsupported setting: XPG_SUS_ENV=ON\n"); |
| // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to |
| // clobber address ranges. If we ever want to support that, we have to do some |
| // testing first. |
| guarantee(false, "XPG_SUS_ENV=ON not supported"); |
| } else { |
| _xpg_sus_mode = 0; |
| } |
| |
| // Switch off AIX internal (pthread) guard pages. This has |
| // immediate effect for any pthread_create calls which follow. |
| p = ::getenv("AIXTHREAD_GUARDPAGES"); |
| if (Verbose) { |
| fprintf(stderr, "AIXTHREAD_GUARDPAGES=%s.\n", p ? p : "<unset>"); |
| fprintf(stderr, "setting AIXTHREAD_GUARDPAGES=0.\n"); |
| } |
| rc = ::putenv("AIXTHREAD_GUARDPAGES=0"); |
| guarantee(rc == 0, ""); |
| |
| } // end: os::Aix::scan_environment() |
| |
| // PASE: initialize the libo4 library (AS400 PASE porting library). |
| void os::Aix::initialize_libo4() { |
| Unimplemented(); |
| } |
| |
| // AIX: initialize the libperfstat library (we load this dynamically |
| // because it is only available on AIX. |
| void os::Aix::initialize_libperfstat() { |
| |
| assert(os::Aix::on_aix(), "AIX only"); |
| |
| if (!libperfstat::init()) { |
| fprintf(stderr, "libperfstat initialization failed.\n"); |
| assert(false, "libperfstat initialization failed"); |
| } else { |
| if (Verbose) { |
| fprintf(stderr, "libperfstat initialized.\n"); |
| } |
| } |
| } // end: os::Aix::initialize_libperfstat |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| // thread stack |
| |
| // function to query the current stack size using pthread_getthrds_np |
| // |
| // ! do not change anything here unless you know what you are doing ! |
| static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) { |
| |
| // This only works when invoked on a pthread. As we agreed not to use |
| // primordial threads anyway, I assert here |
| guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread"); |
| |
| // information about this api can be found (a) in the pthread.h header and |
| // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm |
| // |
| // The use of this API to find out the current stack is kind of undefined. |
| // But after a lot of tries and asking IBM about it, I concluded that it is safe |
| // enough for cases where I let the pthread library create its stacks. For cases |
| // where I create an own stack and pass this to pthread_create, it seems not to |
| // work (the returned stack size in that case is 0). |
| |
| pthread_t tid = pthread_self(); |
| struct __pthrdsinfo pinfo; |
| char dummy[1]; // we only need this to satisfy the api and to not get E |
| int dummy_size = sizeof(dummy); |
| |
| memset(&pinfo, 0, sizeof(pinfo)); |
| |
| const int rc = pthread_getthrds_np (&tid, PTHRDSINFO_QUERY_ALL, &pinfo, |
| sizeof(pinfo), dummy, &dummy_size); |
| |
| if (rc != 0) { |
| fprintf(stderr, "pthread_getthrds_np failed (%d)\n", rc); |
| guarantee(0, "pthread_getthrds_np failed"); |
| } |
| |
| guarantee(pinfo.__pi_stackend, "returned stack base invalid"); |
| |
| // the following can happen when invoking pthread_getthrds_np on a pthread running on a user provided stack |
| // (when handing down a stack to pthread create, see pthread_attr_setstackaddr). |
| // Not sure what to do here - I feel inclined to forbid this use case completely. |
| guarantee(pinfo.__pi_stacksize, "returned stack size invalid"); |
| |
| // On AIX, stacks are not necessarily page aligned so round the base and size accordingly |
| if (p_stack_base) { |
| (*p_stack_base) = (address) align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size()); |
| } |
| |
| if (p_stack_size) { |
| (*p_stack_size) = pinfo.__pi_stacksize - os::Aix::stack_page_size(); |
| } |
| |
| #ifndef PRODUCT |
| if (Verbose) { |
| fprintf(stderr, |
| "query_stack_dimensions() -> real stack_base=" INTPTR_FORMAT ", real stack_addr=" INTPTR_FORMAT |
| ", real stack_size=" INTPTR_FORMAT |
| ", stack_base=" INTPTR_FORMAT ", stack_size=" INTPTR_FORMAT "\n", |
| (intptr_t)pinfo.__pi_stackend, (intptr_t)pinfo.__pi_stackaddr, pinfo.__pi_stacksize, |
| (intptr_t)align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size()), |
| pinfo.__pi_stacksize - os::Aix::stack_page_size()); |
| } |
| #endif |
| |
| } // end query_stack_dimensions |
| |
| // get the current stack base from the OS (actually, the pthread library) |
| address os::current_stack_base() { |
| address p; |
| query_stack_dimensions(&p, 0); |
| return p; |
| } |
| |
| // get the current stack size from the OS (actually, the pthread library) |
| size_t os::current_stack_size() { |
| size_t s; |
| query_stack_dimensions(0, &s); |
| return s; |
| } |
| |
| // Refer to the comments in os_solaris.cpp park-unpark. |
| // |
| // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can |
| // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. |
| // For specifics regarding the bug see GLIBC BUGID 261237 : |
| // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. |
| // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future |
| // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar |
| // is used. (The simple C test-case provided in the GLIBC bug report manifests the |
| // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() |
| // and monitorenter when we're using 1-0 locking. All those operations may result in |
| // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version |
| // of libpthread avoids the problem, but isn't practical. |
| // |
| // Possible remedies: |
| // |
| // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. |
| // This is palliative and probabilistic, however. If the thread is preempted |
| // between the call to compute_abstime() and pthread_cond_timedwait(), more |
| // than the minimum period may have passed, and the abstime may be stale (in the |
| // past) resultin in a hang. Using this technique reduces the odds of a hang |
| // but the JVM is still vulnerable, particularly on heavily loaded systems. |
| // |
| // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead |
| // of the usual flag-condvar-mutex idiom. The write side of the pipe is set |
| // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) |
| // reduces to poll()+read(). This works well, but consumes 2 FDs per extant |
| // thread. |
| // |
| // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread |
| // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing |
| // a timeout request to the chron thread and then blocking via pthread_cond_wait(). |
| // This also works well. In fact it avoids kernel-level scalability impediments |
| // on certain platforms that don't handle lots of active pthread_cond_timedwait() |
| // timers in a graceful fashion. |
| // |
| // 4. When the abstime value is in the past it appears that control returns |
| // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. |
| // Subsequent timedwait/wait calls may hang indefinitely. Given that, we |
| // can avoid the problem by reinitializing the condvar -- by cond_destroy() |
| // followed by cond_init() -- after all calls to pthread_cond_timedwait(). |
| // It may be possible to avoid reinitialization by checking the return |
| // value from pthread_cond_timedwait(). In addition to reinitializing the |
| // condvar we must establish the invariant that cond_signal() is only called |
| // within critical sections protected by the adjunct mutex. This prevents |
| // cond_signal() from "seeing" a condvar that's in the midst of being |
| // reinitialized or that is corrupt. Sadly, this invariant obviates the |
| // desirable signal-after-unlock optimization that avoids futile context switching. |
| // |
| // I'm also concerned that some versions of NTPL might allocate an auxilliary |
| // structure when a condvar is used or initialized. cond_destroy() would |
| // release the helper structure. Our reinitialize-after-timedwait fix |
| // put excessive stress on malloc/free and locks protecting the c-heap. |
| // |
| // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. |
| // It may be possible to refine (4) by checking the kernel and NTPL verisons |
| // and only enabling the work-around for vulnerable environments. |
| |
| // utility to compute the abstime argument to timedwait: |
| // millis is the relative timeout time |
| // abstime will be the absolute timeout time |
| // TODO: replace compute_abstime() with unpackTime() |
| |
| static struct timespec* compute_abstime(timespec* abstime, jlong millis) { |
| if (millis < 0) millis = 0; |
| struct timeval now; |
| int status = gettimeofday(&now, NULL); |
| assert(status == 0, "gettimeofday"); |
| jlong seconds = millis / 1000; |
| millis %= 1000; |
| if (seconds > 50000000) { // see man cond_timedwait(3T) |
| seconds = 50000000; |
| } |
| abstime->tv_sec = now.tv_sec + seconds; |
| long usec = now.tv_usec + millis * 1000; |
| if (usec >= 1000000) { |
| abstime->tv_sec += 1; |
| usec -= 1000000; |
| } |
| abstime->tv_nsec = usec * 1000; |
| return abstime; |
| } |
| |
| |
| // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. |
| // Conceptually TryPark() should be equivalent to park(0). |
| |
| int os::PlatformEvent::TryPark() { |
| for (;;) { |
| const int v = _Event; |
| guarantee ((v == 0) || (v == 1), "invariant"); |
| if (Atomic::cmpxchg (0, &_Event, v) == v) return v; |
| } |
| } |
| |
| void os::PlatformEvent::park() { // AKA "down()" |
| // Invariant: Only the thread associated with the Event/PlatformEvent |
| // may call park(). |
| // TODO: assert that _Assoc != NULL or _Assoc == Self |
| int v; |
| for (;;) { |
| v = _Event; |
| if (Atomic::cmpxchg (v-1, &_Event, v) == v) break; |
| } |
| guarantee (v >= 0, "invariant"); |
| if (v == 0) { |
| // Do this the hard way by blocking ... |
| int status = pthread_mutex_lock(_mutex); |
| assert_status(status == 0, status, "mutex_lock"); |
| guarantee (_nParked == 0, "invariant"); |
| ++ _nParked; |
| while (_Event < 0) { |
| status = pthread_cond_wait(_cond, _mutex); |
| assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait"); |
| } |
| -- _nParked; |
| |
| // In theory we could move the ST of 0 into _Event past the unlock(), |
| // but then we'd need a MEMBAR after the ST. |
| _Event = 0; |
| status = pthread_mutex_unlock(_mutex); |
| assert_status(status == 0, status, "mutex_unlock"); |
| } |
| guarantee (_Event >= 0, "invariant"); |
| } |
| |
| int os::PlatformEvent::park(jlong millis) { |
| guarantee (_nParked == 0, "invariant"); |
| |
| int v; |
| for (;;) { |
| v = _Event; |
| if (Atomic::cmpxchg (v-1, &_Event, v) == v) break; |
| } |
| guarantee (v >= 0, "invariant"); |
| if (v != 0) return OS_OK; |
| |
| // We do this the hard way, by blocking the thread. |
| // Consider enforcing a minimum timeout value. |
| struct timespec abst; |
| compute_abstime(&abst, millis); |
| |
| int ret = OS_TIMEOUT; |
| int status = pthread_mutex_lock(_mutex); |
| assert_status(status == 0, status, "mutex_lock"); |
| guarantee (_nParked == 0, "invariant"); |
| ++_nParked; |
| |
| // Object.wait(timo) will return because of |
| // (a) notification |
| // (b) timeout |
| // (c) thread.interrupt |
| // |
| // Thread.interrupt and object.notify{All} both call Event::set. |
| // That is, we treat thread.interrupt as a special case of notification. |
| // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false. |
| // We assume all ETIME returns are valid. |
| // |
| // TODO: properly differentiate simultaneous notify+interrupt. |
| // In that case, we should propagate the notify to another waiter. |
| |
| while (_Event < 0) { |
| status = pthread_cond_timedwait(_cond, _mutex, &abst); |
| assert_status(status == 0 || status == ETIMEDOUT, |
| status, "cond_timedwait"); |
| if (!FilterSpuriousWakeups) break; // previous semantics |
| if (status == ETIMEDOUT) break; |
| // We consume and ignore EINTR and spurious wakeups. |
| } |
| --_nParked; |
| if (_Event >= 0) { |
| ret = OS_OK; |
| } |
| _Event = 0; |
| status = pthread_mutex_unlock(_mutex); |
| assert_status(status == 0, status, "mutex_unlock"); |
| assert (_nParked == 0, "invariant"); |
| return ret; |
| } |
| |
| void os::PlatformEvent::unpark() { |
| int v, AnyWaiters; |
| for (;;) { |
| v = _Event; |
| if (v > 0) { |
| // The LD of _Event could have reordered or be satisfied |
| // by a read-aside from this processor's write buffer. |
| // To avoid problems execute a barrier and then |
| // ratify the value. |
| OrderAccess::fence(); |
| if (_Event == v) return; |
| continue; |
| } |
| if (Atomic::cmpxchg (v+1, &_Event, v) == v) break; |
| } |
| if (v < 0) { |
| // Wait for the thread associated with the event to vacate |
| int status = pthread_mutex_lock(_mutex); |
| assert_status(status == 0, status, "mutex_lock"); |
| AnyWaiters = _nParked; |
| |
| if (AnyWaiters != 0) { |
| // We intentional signal *after* dropping the lock |
| // to avoid a common class of futile wakeups. |
| status = pthread_cond_signal(_cond); |
| assert_status(status == 0, status, "cond_signal"); |
| } |
| // Mutex should be locked for pthread_cond_signal(_cond). |
| status = pthread_mutex_unlock(_mutex); |
| assert_status(status == 0, status, "mutex_unlock"); |
| } |
| |
| // Note that we signal() _after dropping the lock for "immortal" Events. |
| // This is safe and avoids a common class of futile wakeups. In rare |
| // circumstances this can cause a thread to return prematurely from |
| // cond_{timed}wait() but the spurious wakeup is benign and the victim will |
| // simply re-test the condition and re-park itself. |
| } |
| |
| |
| // JSR166 |
| // ------------------------------------------------------- |
| |
| // |
| // The solaris and linux implementations of park/unpark are fairly |
| // conservative for now, but can be improved. They currently use a |
| // mutex/condvar pair, plus a a count. |
| // Park decrements count if > 0, else does a condvar wait. Unpark |
| // sets count to 1 and signals condvar. Only one thread ever waits |
| // on the condvar. Contention seen when trying to park implies that someone |
| // is unparking you, so don't wait. And spurious returns are fine, so there |
| // is no need to track notifications. |
| // |
| |
| #define MAX_SECS 100000000 |
| // |
| // This code is common to linux and solaris and will be moved to a |
| // common place in dolphin. |
| // |
| // The passed in time value is either a relative time in nanoseconds |
| // or an absolute time in milliseconds. Either way it has to be unpacked |
| // into suitable seconds and nanoseconds components and stored in the |
| // given timespec structure. |
| // Given time is a 64-bit value and the time_t used in the timespec is only |
| // a signed-32-bit value (except on 64-bit Linux) we have to watch for |
| // overflow if times way in the future are given. Further on Solaris versions |
| // prior to 10 there is a restriction (see cond_timedwait) that the specified |
| // number of seconds, in abstime, is less than current_time + 100,000,000. |
| // As it will be 28 years before "now + 100000000" will overflow we can |
| // ignore overflow and just impose a hard-limit on seconds using the value |
| // of "now + 100,000,000". This places a limit on the timeout of about 3.17 |
| // years from "now". |
| // |
| |
| static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { |
| assert (time > 0, "convertTime"); |
| |
| struct timeval now; |
| int status = gettimeofday(&now, NULL); |
| assert(status == 0, "gettimeofday"); |
| |
| time_t max_secs = now.tv_sec + MAX_SECS; |
| |
| if (isAbsolute) { |
| jlong secs = time / 1000; |
| if (secs > max_secs) { |
| absTime->tv_sec = max_secs; |
| } |
| else { |
| absTime->tv_sec = secs; |
| } |
| absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; |
| } |
| else { |
| jlong secs = time / NANOSECS_PER_SEC; |
| if (secs >= MAX_SECS) { |
| absTime->tv_sec = max_secs; |
| absTime->tv_nsec = 0; |
| } |
| else { |
| absTime->tv_sec = now.tv_sec + secs; |
| absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; |
| if (absTime->tv_nsec >= NANOSECS_PER_SEC) { |
| absTime->tv_nsec -= NANOSECS_PER_SEC; |
| ++absTime->tv_sec; // note: this must be <= max_secs |
| } |
| } |
| } |
| assert(absTime->tv_sec >= 0, "tv_sec < 0"); |
| assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); |
| assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); |
| assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); |
| } |
| |
| void Parker::park(bool isAbsolute, jlong time) { |
| // Optional fast-path check: |
| // Return immediately if a permit is available. |
| if (_counter > 0) { |
| _counter = 0; |
| OrderAccess::fence(); |
| return; |
| } |
| |
| Thread* thread = Thread::current(); |
| assert(thread->is_Java_thread(), "Must be JavaThread"); |
| JavaThread *jt = (JavaThread *)thread; |
| |
| // Optional optimization -- avoid state transitions if there's an interrupt pending. |
| // Check interrupt before trying to wait |
| if (Thread::is_interrupted(thread, false)) { |
| return; |
| } |
| |
| // Next, demultiplex/decode time arguments |
| timespec absTime; |
| if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all |
| return; |
| } |
| if (time > 0) { |
| unpackTime(&absTime, isAbsolute, time); |
| } |
| |
| |
| // Enter safepoint region |
| // Beware of deadlocks such as 6317397. |
| // The per-thread Parker:: mutex is a classic leaf-lock. |
| // In particular a thread must never block on the Threads_lock while |
| // holding the Parker:: mutex. If safepoints are pending both the |
| // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. |
| ThreadBlockInVM tbivm(jt); |
| |
| // Don't wait if cannot get lock since interference arises from |
| // unblocking. Also. check interrupt before trying wait |
| if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { |
| return; |
| } |
| |
| int status; |
| if (_counter > 0) { // no wait needed |
| _counter = 0; |
| status = pthread_mutex_unlock(_mutex); |
| assert (status == 0, "invariant"); |
| OrderAccess::fence(); |
| return; |
| } |
| |
| #ifdef ASSERT |
| // Don't catch signals while blocked; let the running threads have the signals. |
| // (This allows a debugger to break into the running thread.) |
| sigset_t oldsigs; |
| sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals(); |
| pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); |
| #endif |
| |
| OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); |
| jt->set_suspend_equivalent(); |
| // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() |
| |
| if (time == 0) { |
| status = pthread_cond_wait (_cond, _mutex); |
| } else { |
| status = pthread_cond_timedwait (_cond, _mutex, &absTime); |
| if (status != 0 && WorkAroundNPTLTimedWaitHang) { |
| pthread_cond_destroy (_cond); |
| pthread_cond_init (_cond, NULL); |
| } |
| } |
| assert_status(status == 0 || status == EINTR || |
| status == ETIME || status == ETIMEDOUT, |
| status, "cond_timedwait"); |
| |
| #ifdef ASSERT |
| pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); |
| #endif |
| |
| _counter = 0; |
| status = pthread_mutex_unlock(_mutex); |
| assert_status(status == 0, status, "invariant"); |
| // If externally suspended while waiting, re-suspend |
| if (jt->handle_special_suspend_equivalent_condition()) { |
| jt->java_suspend_self(); |
| } |
| |
| OrderAccess::fence(); |
| } |
| |
| void Parker::unpark() { |
| int s, status; |
| status = pthread_mutex_lock(_mutex); |
| assert (status == 0, "invariant"); |
| s = _counter; |
| _counter = 1; |
| if (s < 1) { |
| if (WorkAroundNPTLTimedWaitHang) { |
| status = pthread_cond_signal (_cond); |
| assert (status == 0, "invariant"); |
| status = pthread_mutex_unlock(_mutex); |
| assert (status == 0, "invariant"); |
| } else { |
| status = pthread_mutex_unlock(_mutex); |
| assert (status == 0, "invariant"); |
| status = pthread_cond_signal (_cond); |
| assert (status == 0, "invariant"); |
| } |
| } else { |
| pthread_mutex_unlock(_mutex); |
| assert (status == 0, "invariant"); |
| } |
| } |
| |
| |
| extern char** environ; |
| |
| // Run the specified command in a separate process. Return its exit value, |
| // or -1 on failure (e.g. can't fork a new process). |
| // Unlike system(), this function can be called from signal handler. It |
| // doesn't block SIGINT et al. |
| int os::fork_and_exec(char* cmd) { |
| char * argv[4] = {"sh", "-c", cmd, NULL}; |
| |
| pid_t pid = fork(); |
| |
| if (pid < 0) { |
| // fork failed |
| return -1; |
| |
| } else if (pid == 0) { |
| // child process |
| |
| // try to be consistent with system(), which uses "/usr/bin/sh" on AIX |
| execve("/usr/bin/sh", argv, environ); |
| |
| // execve failed |
| _exit(-1); |
| |
| } else { |
| // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't |
| // care about the actual exit code, for now. |
| |
| int status; |
| |
| // Wait for the child process to exit. This returns immediately if |
| // the child has already exited. */ |
| while (waitpid(pid, &status, 0) < 0) { |
| switch (errno) { |
| case ECHILD: return 0; |
| case EINTR: break; |
| default: return -1; |
| } |
| } |
| |
| if (WIFEXITED(status)) { |
| // The child exited normally; get its exit code. |
| return WEXITSTATUS(status); |
| } else if (WIFSIGNALED(status)) { |
| // The child exited because of a signal |
| // The best value to return is 0x80 + signal number, |
| // because that is what all Unix shells do, and because |
| // it allows callers to distinguish between process exit and |
| // process death by signal. |
| return 0x80 + WTERMSIG(status); |
| } else { |
| // Unknown exit code; pass it through |
| return status; |
| } |
| } |
| // Remove warning. |
| return -1; |
| } |
| |
| // is_headless_jre() |
| // |
| // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
| // in order to report if we are running in a headless jre. |
| // |
| // Since JDK8 xawt/libmawt.so is moved into the same directory |
| // as libawt.so, and renamed libawt_xawt.so |
| bool os::is_headless_jre() { |
| struct stat statbuf; |
| char buf[MAXPATHLEN]; |
| char libmawtpath[MAXPATHLEN]; |
| const char *xawtstr = "/xawt/libmawt.so"; |
| const char *new_xawtstr = "/libawt_xawt.so"; |
| |
| char *p; |
| |
| // Get path to libjvm.so |
| os::jvm_path(buf, sizeof(buf)); |
| |
| // Get rid of libjvm.so |
| p = strrchr(buf, '/'); |
| if (p == NULL) return false; |
| else *p = '\0'; |
| |
| // Get rid of client or server |
| p = strrchr(buf, '/'); |
| if (p == NULL) return false; |
| else *p = '\0'; |
| |
| // check xawt/libmawt.so |
| strcpy(libmawtpath, buf); |
| strcat(libmawtpath, xawtstr); |
| if (::stat(libmawtpath, &statbuf) == 0) return false; |
| |
| // check libawt_xawt.so |
| strcpy(libmawtpath, buf); |
| strcat(libmawtpath, new_xawtstr); |
| if (::stat(libmawtpath, &statbuf) == 0) return false; |
| |
| return true; |
| } |
| |
| // Get the default path to the core file |
| // Returns the length of the string |
| int os::get_core_path(char* buffer, size_t bufferSize) { |
| const char* p = get_current_directory(buffer, bufferSize); |
| |
| if (p == NULL) { |
| assert(p != NULL, "failed to get current directory"); |
| return 0; |
| } |
| |
| return strlen(buffer); |
| } |
| |
| #ifndef PRODUCT |
| void TestReserveMemorySpecial_test() { |
| // No tests available for this platform |
| } |
| #endif |