| /* |
| * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| |
| class ThreadSafepointState; |
| class ThreadProfiler; |
| |
| class JvmtiThreadState; |
| class JvmtiGetLoadedClassesClosure; |
| class ThreadStatistics; |
| class ConcurrentLocksDump; |
| class ParkEvent ; |
| |
| class ciEnv; |
| class CompileThread; |
| class CompileLog; |
| class CompileTask; |
| class CompileQueue; |
| class CompilerCounters; |
| class vframeArray; |
| |
| class DeoptResourceMark; |
| class jvmtiDeferredLocalVariableSet; |
| |
| class GCTaskQueue; |
| class ThreadClosure; |
| class IdealGraphPrinter; |
| |
| // Class hierarchy |
| // - Thread |
| // - VMThread |
| // - JavaThread |
| // - WatcherThread |
| |
| class Thread: public ThreadShadow { |
| friend class VMStructs; |
| private: |
| // Exception handling |
| // (Note: _pending_exception and friends are in ThreadShadow) |
| //oop _pending_exception; // pending exception for current thread |
| // const char* _exception_file; // file information for exception (debugging only) |
| // int _exception_line; // line information for exception (debugging only) |
| |
| // Support for forcing alignment of thread objects for biased locking |
| void* _real_malloc_address; |
| public: |
| void* operator new(size_t size); |
| void operator delete(void* p); |
| private: |
| |
| // *************************************************************** |
| // Suspend and resume support |
| // *************************************************************** |
| // |
| // VM suspend/resume no longer exists - it was once used for various |
| // things including safepoints but was deprecated and finally removed |
| // in Java 7. Because VM suspension was considered "internal" Java-level |
| // suspension was considered "external", and this legacy naming scheme |
| // remains. |
| // |
| // External suspend/resume requests come from JVM_SuspendThread, |
| // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI |
| // ResumeThread. External |
| // suspend requests cause _external_suspend to be set and external |
| // resume requests cause _external_suspend to be cleared. |
| // External suspend requests do not nest on top of other external |
| // suspend requests. The higher level APIs reject suspend requests |
| // for already suspended threads. |
| // |
| // The external_suspend |
| // flag is checked by has_special_runtime_exit_condition() and java thread |
| // will self-suspend when handle_special_runtime_exit_condition() is |
| // called. Most uses of the _thread_blocked state in JavaThreads are |
| // considered the same as being externally suspended; if the blocking |
| // condition lifts, the JavaThread will self-suspend. Other places |
| // where VM checks for external_suspend include: |
| // + mutex granting (do not enter monitors when thread is suspended) |
| // + state transitions from _thread_in_native |
| // |
| // In general, java_suspend() does not wait for an external suspend |
| // request to complete. When it returns, the only guarantee is that |
| // the _external_suspend field is true. |
| // |
| // wait_for_ext_suspend_completion() is used to wait for an external |
| // suspend request to complete. External suspend requests are usually |
| // followed by some other interface call that requires the thread to |
| // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into |
| // the interface that requires quiescence, we give the JavaThread a |
| // chance to self-suspend before we need it to be quiescent. This |
| // improves overall suspend/query performance. |
| // |
| // _suspend_flags controls the behavior of java_ suspend/resume. |
| // It must be set under the protection of SR_lock. Read from the flag is |
| // OK without SR_lock as long as the value is only used as a hint. |
| // (e.g., check _external_suspend first without lock and then recheck |
| // inside SR_lock and finish the suspension) |
| // |
| // _suspend_flags is also overloaded for other "special conditions" so |
| // that a single check indicates whether any special action is needed |
| // eg. for async exceptions. |
| // ------------------------------------------------------------------- |
| // Notes: |
| // 1. The suspend/resume logic no longer uses ThreadState in OSThread |
| // but we still update its value to keep other part of the system (mainly |
| // JVMTI) happy. ThreadState is legacy code (see notes in |
| // osThread.hpp). |
| // |
| // 2. It would be more natural if set_external_suspend() is private and |
| // part of java_suspend(), but that probably would affect the suspend/query |
| // performance. Need more investigation on this. |
| // |
| |
| // suspend/resume lock: used for self-suspend |
| Monitor* _SR_lock; |
| |
| protected: |
| enum SuspendFlags { |
| // NOTE: avoid using the sign-bit as cc generates different test code |
| // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 |
| |
| _external_suspend = 0x20000000U, // thread is asked to self suspend |
| _ext_suspended = 0x40000000U, // thread has self-suspended |
| _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt |
| |
| _has_async_exception = 0x00000001U // there is a pending async exception |
| }; |
| |
| // various suspension related flags - atomically updated |
| // overloaded for async exception checking in check_special_condition_for_native_trans. |
| volatile uint32_t _suspend_flags; |
| |
| private: |
| int _num_nested_signal; |
| |
| public: |
| void enter_signal_handler() { _num_nested_signal++; } |
| void leave_signal_handler() { _num_nested_signal--; } |
| bool is_inside_signal_handler() const { return _num_nested_signal > 0; } |
| |
| private: |
| // Debug tracing |
| static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; |
| |
| // Active_handles points to a block of handles |
| JNIHandleBlock* _active_handles; |
| |
| // One-element thread local free list |
| JNIHandleBlock* _free_handle_block; |
| |
| // Point to the last handle mark |
| HandleMark* _last_handle_mark; |
| |
| // The parity of the last strong_roots iteration in which this thread was |
| // claimed as a task. |
| jint _oops_do_parity; |
| |
| public: |
| void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } |
| HandleMark* last_handle_mark() const { return _last_handle_mark; } |
| private: |
| |
| // debug support for checking if code does allow safepoints or not |
| // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on |
| // mutex, or blocking on an object synchronizer (Java locking). |
| // If !allow_safepoint(), then an assertion failure will happen in any of the above cases |
| // If !allow_allocation(), then an assertion failure will happen during allocation |
| // (Hence, !allow_safepoint() => !allow_allocation()). |
| // |
| // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. |
| // |
| NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen |
| debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. |
| |
| // Record when GC is locked out via the GC_locker mechanism |
| CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) |
| |
| friend class No_Alloc_Verifier; |
| friend class No_Safepoint_Verifier; |
| friend class Pause_No_Safepoint_Verifier; |
| friend class ThreadLocalStorage; |
| friend class GC_locker; |
| |
| // In order for all threads to be able to use fast locking, we need to know the highest stack |
| // address of where a lock is on the stack (stacks normally grow towards lower addresses). This |
| // variable is initially set to NULL, indicating no locks are used by the thread. During the thread's |
| // execution, it will be set whenever locking can happen, i.e., when we call out to Java code or use |
| // an ObjectLocker. The value is never decreased, hence, it will over the lifetime of a thread |
| // approximate the real stackbase. |
| address _highest_lock; // Highest stack address where a JavaLock exist |
| |
| ThreadLocalAllocBuffer _tlab; // Thread-local eden |
| |
| int _vm_operation_started_count; // VM_Operation support |
| int _vm_operation_completed_count; // VM_Operation support |
| |
| ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread |
| // is waiting to lock |
| bool _current_pending_monitor_is_from_java; // locking is from Java code |
| |
| // ObjectMonitor on which this thread called Object.wait() |
| ObjectMonitor* _current_waiting_monitor; |
| |
| // Private thread-local objectmonitor list - a simple cache organized as a SLL. |
| public: |
| ObjectMonitor * omFreeList ; |
| int omFreeCount ; // length of omFreeList |
| int omFreeProvision ; // reload chunk size |
| |
| public: |
| enum { |
| is_definitely_current_thread = true |
| }; |
| |
| // Constructor |
| Thread(); |
| virtual ~Thread(); |
| |
| // initializtion |
| void initialize_thread_local_storage(); |
| |
| // thread entry point |
| virtual void run(); |
| |
| // Testers |
| virtual bool is_VM_thread() const { return false; } |
| virtual bool is_Java_thread() const { return false; } |
| // Remove this ifdef when C1 is ported to the compiler interface. |
| virtual bool is_Compiler_thread() const { return false; } |
| virtual bool is_hidden_from_external_view() const { return false; } |
| virtual bool is_jvmti_agent_thread() const { return false; } |
| // True iff the thread can perform GC operations at a safepoint. |
| // Generally will be true only of VM thread and parallel GC WorkGang |
| // threads. |
| virtual bool is_GC_task_thread() const { return false; } |
| virtual bool is_Watcher_thread() const { return false; } |
| virtual bool is_ConcurrentGC_thread() const { return false; } |
| |
| virtual char* name() const { return (char*)"Unknown thread"; } |
| |
| // Returns the current thread |
| static inline Thread* current(); |
| |
| // Common thread operations |
| static void set_priority(Thread* thread, ThreadPriority priority); |
| static ThreadPriority get_priority(const Thread* const thread); |
| static void start(Thread* thread); |
| static void interrupt(Thread* thr); |
| static bool is_interrupted(Thread* thr, bool clear_interrupted); |
| |
| Monitor* SR_lock() const { return _SR_lock; } |
| |
| bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } |
| |
| void set_suspend_flag(SuspendFlags f) { |
| assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); |
| uint32_t flags; |
| do { |
| flags = _suspend_flags; |
| } |
| while (Atomic::cmpxchg((jint)(flags | f), |
| (volatile jint*)&_suspend_flags, |
| (jint)flags) != (jint)flags); |
| } |
| void clear_suspend_flag(SuspendFlags f) { |
| assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); |
| uint32_t flags; |
| do { |
| flags = _suspend_flags; |
| } |
| while (Atomic::cmpxchg((jint)(flags & ~f), |
| (volatile jint*)&_suspend_flags, |
| (jint)flags) != (jint)flags); |
| } |
| |
| void set_has_async_exception() { |
| set_suspend_flag(_has_async_exception); |
| } |
| void clear_has_async_exception() { |
| clear_suspend_flag(_has_async_exception); |
| } |
| |
| // Support for Unhandled Oop detection |
| #ifdef CHECK_UNHANDLED_OOPS |
| private: |
| UnhandledOops *_unhandled_oops; |
| public: |
| UnhandledOops* unhandled_oops() { return _unhandled_oops; } |
| // Mark oop safe for gc. It may be stack allocated but won't move. |
| void allow_unhandled_oop(oop *op) { |
| if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); |
| } |
| // Clear oops at safepoint so crashes point to unhandled oop violator |
| void clear_unhandled_oops() { |
| if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); |
| } |
| bool is_gc_locked_out() { return _gc_locked_out_count > 0; } |
| #endif // CHECK_UNHANDLED_OOPS |
| |
| public: |
| // Installs a pending exception to be inserted later |
| static void send_async_exception(oop thread_oop, oop java_throwable); |
| |
| // Resource area |
| ResourceArea* resource_area() const { return _resource_area; } |
| void set_resource_area(ResourceArea* area) { _resource_area = area; } |
| |
| OSThread* osthread() const { return _osthread; } |
| void set_osthread(OSThread* thread) { _osthread = thread; } |
| |
| // JNI handle support |
| JNIHandleBlock* active_handles() const { return _active_handles; } |
| void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } |
| JNIHandleBlock* free_handle_block() const { return _free_handle_block; } |
| void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } |
| |
| // Internal handle support |
| HandleArea* handle_area() const { return _handle_area; } |
| void set_handle_area(HandleArea* area) { _handle_area = area; } |
| |
| // Thread-Local Allocation Buffer (TLAB) support |
| ThreadLocalAllocBuffer& tlab() { return _tlab; } |
| void initialize_tlab() { |
| if (UseTLAB) { |
| tlab().initialize(); |
| } |
| } |
| |
| // VM operation support |
| int vm_operation_ticket() { return ++_vm_operation_started_count; } |
| int vm_operation_completed_count() { return _vm_operation_completed_count; } |
| void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } |
| |
| // For tracking the heavyweight monitor the thread is pending on. |
| ObjectMonitor* current_pending_monitor() { |
| return _current_pending_monitor; |
| } |
| void set_current_pending_monitor(ObjectMonitor* monitor) { |
| _current_pending_monitor = monitor; |
| } |
| void set_current_pending_monitor_is_from_java(bool from_java) { |
| _current_pending_monitor_is_from_java = from_java; |
| } |
| bool current_pending_monitor_is_from_java() { |
| return _current_pending_monitor_is_from_java; |
| } |
| |
| // For tracking the ObjectMonitor on which this thread called Object.wait() |
| ObjectMonitor* current_waiting_monitor() { |
| return _current_waiting_monitor; |
| } |
| void set_current_waiting_monitor(ObjectMonitor* monitor) { |
| _current_waiting_monitor = monitor; |
| } |
| |
| // GC support |
| // Apply "f->do_oop" to all root oops in "this". |
| void oops_do(OopClosure* f); |
| |
| // Handles the parallel case for the method below. |
| private: |
| bool claim_oops_do_par_case(int collection_parity); |
| public: |
| // Requires that "collection_parity" is that of the current strong roots |
| // iteration. If "is_par" is false, sets the parity of "this" to |
| // "collection_parity", and returns "true". If "is_par" is true, |
| // uses an atomic instruction to set the current threads parity to |
| // "collection_parity", if it is not already. Returns "true" iff the |
| // calling thread does the update, this indicates that the calling thread |
| // has claimed the thread's stack as a root groop in the current |
| // collection. |
| bool claim_oops_do(bool is_par, int collection_parity) { |
| if (!is_par) { |
| _oops_do_parity = collection_parity; |
| return true; |
| } else { |
| return claim_oops_do_par_case(collection_parity); |
| } |
| } |
| |
| // Sweeper support |
| void nmethods_do(); |
| |
| // Fast-locking support |
| address highest_lock() const { return _highest_lock; } |
| void update_highest_lock(address base) { if (base > _highest_lock) _highest_lock = base; } |
| |
| // Tells if adr belong to this thread. This is used |
| // for checking if a lock is owned by the running thread. |
| // Warning: the method can only be used on the running thread |
| // Fast lock support uses these methods |
| virtual bool lock_is_in_stack(address adr) const; |
| virtual bool is_lock_owned(address adr) const; |
| |
| // Check if address is in the stack of the thread (not just for locks). |
| bool is_in_stack(address adr) const; |
| |
| // Sets this thread as starting thread. Returns failure if thread |
| // creation fails due to lack of memory, too many threads etc. |
| bool set_as_starting_thread(); |
| |
| protected: |
| // OS data associated with the thread |
| OSThread* _osthread; // Platform-specific thread information |
| |
| // Thread local resource area for temporary allocation within the VM |
| ResourceArea* _resource_area; |
| |
| // Thread local handle area for allocation of handles within the VM |
| HandleArea* _handle_area; |
| |
| // Support for stack overflow handling, get_thread, etc. |
| address _stack_base; |
| size_t _stack_size; |
| uintptr_t _self_raw_id; // used by get_thread (mutable) |
| int _lgrp_id; |
| |
| public: |
| // Stack overflow support |
| address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } |
| |
| void set_stack_base(address base) { _stack_base = base; } |
| size_t stack_size() const { return _stack_size; } |
| void set_stack_size(size_t size) { _stack_size = size; } |
| void record_stack_base_and_size(); |
| |
| int lgrp_id() const { return _lgrp_id; } |
| void set_lgrp_id(int value) { _lgrp_id = value; } |
| |
| // Printing |
| void print_on(outputStream* st) const; |
| void print() const { print_on(tty); } |
| virtual void print_on_error(outputStream* st, char* buf, int buflen) const; |
| |
| // Debug-only code |
| |
| #ifdef ASSERT |
| private: |
| // Deadlock detection support for Mutex locks. List of locks own by thread. |
| Monitor *_owned_locks; |
| // Mutex::set_owner_implementation is the only place where _owned_locks is modified, |
| // thus the friendship |
| friend class Mutex; |
| friend class Monitor; |
| |
| public: |
| void print_owned_locks_on(outputStream* st) const; |
| void print_owned_locks() const { print_owned_locks_on(tty); } |
| Monitor * owned_locks() const { return _owned_locks; } |
| bool owns_locks() const { return owned_locks() != NULL; } |
| bool owns_locks_but_compiled_lock() const; |
| |
| // Deadlock detection |
| bool allow_allocation() { return _allow_allocation_count == 0; } |
| #endif |
| |
| void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; |
| |
| private: |
| volatile int _jvmti_env_iteration_count; |
| |
| public: |
| void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } |
| void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } |
| bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } |
| |
| // Code generation |
| static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } |
| static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } |
| static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } |
| |
| static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } |
| static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } |
| static ByteSize omFreeList_offset() { return byte_offset_of(Thread, omFreeList); } |
| |
| #define TLAB_FIELD_OFFSET(name) \ |
| static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } |
| |
| TLAB_FIELD_OFFSET(start) |
| TLAB_FIELD_OFFSET(end) |
| TLAB_FIELD_OFFSET(top) |
| TLAB_FIELD_OFFSET(pf_top) |
| TLAB_FIELD_OFFSET(size) // desired_size |
| TLAB_FIELD_OFFSET(refill_waste_limit) |
| TLAB_FIELD_OFFSET(number_of_refills) |
| TLAB_FIELD_OFFSET(fast_refill_waste) |
| TLAB_FIELD_OFFSET(slow_allocations) |
| |
| #undef TLAB_FIELD_OFFSET |
| |
| public: |
| volatile intptr_t _Stalled ; |
| volatile int _TypeTag ; |
| ParkEvent * _ParkEvent ; // for synchronized() |
| ParkEvent * _SleepEvent ; // for Thread.sleep |
| ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor |
| ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease |
| int NativeSyncRecursion ; // diagnostic |
| |
| volatile int _OnTrap ; // Resume-at IP delta |
| jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG |
| jint _hashStateX ; // thread-specific hashCode generator state |
| jint _hashStateY ; |
| jint _hashStateZ ; |
| void * _schedctl ; |
| |
| intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code |
| static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } |
| static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } |
| |
| volatile jint rng [4] ; // RNG for spin loop |
| |
| // Low-level leaf-lock primitives used to implement synchronization |
| // and native monitor-mutex infrastructure. |
| // Not for general synchronization use. |
| static void SpinAcquire (volatile int * Lock, const char * Name) ; |
| static void SpinRelease (volatile int * Lock) ; |
| static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; |
| static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; |
| static void muxRelease (volatile intptr_t * Lock) ; |
| |
| }; |
| |
| // Inline implementation of Thread::current() |
| // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of |
| // startup. |
| // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same |
| // period. This is inlined in thread_<os_family>.inline.hpp. |
| |
| inline Thread* Thread::current() { |
| #ifdef ASSERT |
| // This function is very high traffic. Define PARANOID to enable expensive |
| // asserts. |
| #ifdef PARANOID |
| // Signal handler should call ThreadLocalStorage::get_thread_slow() |
| Thread* t = ThreadLocalStorage::get_thread_slow(); |
| assert(t != NULL && !t->is_inside_signal_handler(), |
| "Don't use Thread::current() inside signal handler"); |
| #endif |
| #endif |
| Thread* thread = ThreadLocalStorage::thread(); |
| assert(thread != NULL, "just checking"); |
| return thread; |
| } |
| |
| // Name support for threads. non-JavaThread subclasses with multiple |
| // uniquely named instances should derive from this. |
| class NamedThread: public Thread { |
| friend class VMStructs; |
| enum { |
| max_name_len = 64 |
| }; |
| private: |
| char* _name; |
| public: |
| NamedThread(); |
| ~NamedThread(); |
| // May only be called once per thread. |
| void set_name(const char* format, ...); |
| virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
| }; |
| |
| // Worker threads are named and have an id of an assigned work. |
| class WorkerThread: public NamedThread { |
| private: |
| uint _id; |
| public: |
| WorkerThread() : _id(0) { } |
| void set_id(uint work_id) { _id = work_id; } |
| uint id() const { return _id; } |
| }; |
| |
| // A single WatcherThread is used for simulating timer interrupts. |
| class WatcherThread: public Thread { |
| friend class VMStructs; |
| public: |
| virtual void run(); |
| |
| private: |
| static WatcherThread* _watcher_thread; |
| |
| static bool _should_terminate; |
| public: |
| enum SomeConstants { |
| delay_interval = 10 // interrupt delay in milliseconds |
| }; |
| |
| // Constructor |
| WatcherThread(); |
| |
| // Tester |
| bool is_Watcher_thread() const { return true; } |
| |
| // Printing |
| char* name() const { return (char*)"VM Periodic Task Thread"; } |
| void print_on(outputStream* st) const; |
| void print() const { print_on(tty); } |
| |
| // Returns the single instance of WatcherThread |
| static WatcherThread* watcher_thread() { return _watcher_thread; } |
| |
| // Create and start the single instance of WatcherThread, or stop it on shutdown |
| static void start(); |
| static void stop(); |
| }; |
| |
| |
| class CompilerThread; |
| |
| typedef void (*ThreadFunction)(JavaThread*, TRAPS); |
| |
| class JavaThread: public Thread { |
| friend class VMStructs; |
| private: |
| JavaThread* _next; // The next thread in the Threads list |
| oop _threadObj; // The Java level thread object |
| |
| #ifdef ASSERT |
| private: |
| int _java_call_counter; |
| |
| public: |
| int java_call_counter() { return _java_call_counter; } |
| void inc_java_call_counter() { _java_call_counter++; } |
| void dec_java_call_counter() { |
| assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); |
| _java_call_counter--; |
| } |
| private: // restore original namespace restriction |
| #endif // ifdef ASSERT |
| |
| #ifndef PRODUCT |
| public: |
| enum { |
| jump_ring_buffer_size = 16 |
| }; |
| private: // restore original namespace restriction |
| #endif |
| |
| JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state |
| |
| ThreadFunction _entry_point; |
| |
| JNIEnv _jni_environment; |
| |
| // Deopt support |
| DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization |
| |
| intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we |
| // transition out of native |
| |
| vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays |
| vframeArray* _vframe_array_last; // Holds last vFrameArray we popped |
| // Because deoptimization is lazy we must save jvmti requests to set locals |
| // in compiled frames until we deoptimize and we have an interpreter frame. |
| // This holds the pointer to array (yeah like there might be more than one) of |
| // description of compiled vframes that have locals that need to be updated. |
| GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; |
| |
| // Handshake value for fixing 6243940. We need a place for the i2c |
| // adapter to store the callee methodOop. This value is NEVER live |
| // across a gc point so it does NOT have to be gc'd |
| // The handshake is open ended since we can't be certain that it will |
| // be NULLed. This is because we rarely ever see the race and end up |
| // in handle_wrong_method which is the backend of the handshake. See |
| // code in i2c adapters and handle_wrong_method. |
| |
| methodOop _callee_target; |
| |
| // Oop results of VM runtime calls |
| oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved |
| oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved |
| |
| MonitorChunk* _monitor_chunks; // Contains the off stack monitors |
| // allocated during deoptimization |
| // and by JNI_MonitorEnter/Exit |
| |
| // Async. requests support |
| enum AsyncRequests { |
| _no_async_condition = 0, |
| _async_exception, |
| _async_unsafe_access_error |
| }; |
| AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request |
| oop _pending_async_exception; |
| |
| // Safepoint support |
| public: // Expose _thread_state for SafeFetchInt() |
| volatile JavaThreadState _thread_state; |
| private: |
| ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint |
| address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened |
| |
| // JavaThread termination support |
| enum TerminatedTypes { |
| _not_terminated = 0xDEAD - 2, |
| _thread_exiting, // JavaThread::exit() has been called for this thread |
| _thread_terminated, // JavaThread is removed from thread list |
| _vm_exited // JavaThread is still executing native code, but VM is terminated |
| // only VM_Exit can set _vm_exited |
| }; |
| |
| // In general a JavaThread's _terminated field transitions as follows: |
| // |
| // _not_terminated => _thread_exiting => _thread_terminated |
| // |
| // _vm_exited is a special value to cover the case of a JavaThread |
| // executing native code after the VM itself is terminated. |
| TerminatedTypes _terminated; |
| // suspend/resume support |
| volatile bool _suspend_equivalent; // Suspend equivalent condition |
| jint _in_deopt_handler; // count of deoptimization |
| // handlers thread is in |
| volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access |
| bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was |
| // never locked) when throwing an exception. Used by interpreter only. |
| |
| // Flag to mark a JNI thread in the process of attaching - See CR 6404306 |
| // This flag is never set true other than at construction, and in that case |
| // is shortly thereafter set false |
| volatile bool _is_attaching; |
| |
| public: |
| // State of the stack guard pages for this thread. |
| enum StackGuardState { |
| stack_guard_unused, // not needed |
| stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow |
| stack_guard_enabled // enabled |
| }; |
| |
| private: |
| |
| StackGuardState _stack_guard_state; |
| |
| // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is |
| // used to temp. parsing values into and out of the runtime system during exception handling for compiled |
| // code) |
| volatile oop _exception_oop; // Exception thrown in compiled code |
| volatile address _exception_pc; // PC where exception happened |
| volatile address _exception_handler_pc; // PC for handler of exception |
| volatile int _exception_stack_size; // Size of frame where exception happened |
| |
| // support for compilation |
| bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) |
| |
| // support for JNI critical regions |
| jint _jni_active_critical; // count of entries into JNI critical region |
| |
| // For deadlock detection. |
| int _depth_first_number; |
| |
| // JVMTI PopFrame support |
| // This is set to popframe_pending to signal that top Java frame should be popped immediately |
| int _popframe_condition; |
| |
| #ifndef PRODUCT |
| int _jmp_ring_index; |
| struct { |
| // We use intptr_t instead of address so debugger doesn't try and display strings |
| intptr_t _target; |
| intptr_t _instruction; |
| const char* _file; |
| int _line; |
| } _jmp_ring[ jump_ring_buffer_size ]; |
| #endif /* PRODUCT */ |
| |
| #ifndef SERIALGC |
| // Support for G1 barriers |
| |
| ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. |
| // Set of all such queues. |
| static SATBMarkQueueSet _satb_mark_queue_set; |
| |
| DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. |
| // Set of all such queues. |
| static DirtyCardQueueSet _dirty_card_queue_set; |
| |
| void flush_barrier_queues(); |
| #endif // !SERIALGC |
| |
| friend class VMThread; |
| friend class ThreadWaitTransition; |
| friend class VM_Exit; |
| |
| void initialize(); // Initialized the instance variables |
| |
| public: |
| // Constructor |
| JavaThread(bool is_attaching = false); // for main thread and JNI attached threads |
| JavaThread(ThreadFunction entry_point, size_t stack_size = 0); |
| ~JavaThread(); |
| |
| #ifdef ASSERT |
| // verify this JavaThread hasn't be published in the Threads::list yet |
| void verify_not_published(); |
| #endif |
| |
| //JNI functiontable getter/setter for JVMTI jni function table interception API. |
| void set_jni_functions(struct JNINativeInterface_* functionTable) { |
| _jni_environment.functions = functionTable; |
| } |
| struct JNINativeInterface_* get_jni_functions() { |
| return (struct JNINativeInterface_ *)_jni_environment.functions; |
| } |
| |
| // Executes Shutdown.shutdown() |
| void invoke_shutdown_hooks(); |
| |
| // Cleanup on thread exit |
| enum ExitType { |
| normal_exit, |
| jni_detach |
| }; |
| void exit(bool destroy_vm, ExitType exit_type = normal_exit); |
| |
| void cleanup_failed_attach_current_thread(); |
| |
| // Testers |
| virtual bool is_Java_thread() const { return true; } |
| |
| // compilation |
| void set_is_compiling(bool f) { _is_compiling = f; } |
| bool is_compiling() const { return _is_compiling; } |
| |
| // Thread chain operations |
| JavaThread* next() const { return _next; } |
| void set_next(JavaThread* p) { _next = p; } |
| |
| // Thread oop. threadObj() can be NULL for initial JavaThread |
| // (or for threads attached via JNI) |
| oop threadObj() const { return _threadObj; } |
| void set_threadObj(oop p) { _threadObj = p; } |
| |
| ThreadPriority java_priority() const; // Read from threadObj() |
| |
| // Prepare thread and add to priority queue. If a priority is |
| // not specified, use the priority of the thread object. Threads_lock |
| // must be held while this function is called. |
| void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); |
| |
| void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } |
| address saved_exception_pc() { return _saved_exception_pc; } |
| |
| |
| ThreadFunction entry_point() const { return _entry_point; } |
| |
| // Allocates a new Java level thread object for this thread. thread_name may be NULL. |
| void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); |
| |
| // Last frame anchor routines |
| |
| JavaFrameAnchor* frame_anchor(void) { return &_anchor; } |
| |
| // last_Java_sp |
| bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } |
| intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } |
| |
| // last_Java_pc |
| |
| address last_Java_pc(void) { return _anchor.last_Java_pc(); } |
| |
| // Safepoint support |
| JavaThreadState thread_state() const { return _thread_state; } |
| void set_thread_state(JavaThreadState s) { _thread_state=s; } |
| ThreadSafepointState *safepoint_state() const { return _safepoint_state; } |
| void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } |
| bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } |
| |
| // thread has called JavaThread::exit() or is terminated |
| bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } |
| // thread is terminated (no longer on the threads list); we compare |
| // against the two non-terminated values so that a freed JavaThread |
| // will also be considered terminated. |
| bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } |
| void set_terminated(TerminatedTypes t) { _terminated = t; } |
| // special for Threads::remove() which is static: |
| void set_terminated_value() { _terminated = _thread_terminated; } |
| void block_if_vm_exited(); |
| |
| bool doing_unsafe_access() { return _doing_unsafe_access; } |
| void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } |
| |
| bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } |
| void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } |
| |
| |
| // Suspend/resume support for JavaThread |
| |
| private: |
| void set_ext_suspended() { set_suspend_flag (_ext_suspended); } |
| void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } |
| |
| public: |
| void java_suspend(); |
| void java_resume(); |
| int java_suspend_self(); |
| |
| void check_and_wait_while_suspended() { |
| assert(JavaThread::current() == this, "sanity check"); |
| |
| bool do_self_suspend; |
| do { |
| // were we externally suspended while we were waiting? |
| do_self_suspend = handle_special_suspend_equivalent_condition(); |
| if (do_self_suspend) { |
| // don't surprise the thread that suspended us by returning |
| java_suspend_self(); |
| set_suspend_equivalent(); |
| } |
| } while (do_self_suspend); |
| } |
| static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); |
| // Check for async exception in addition to safepoint and suspend request. |
| static void check_special_condition_for_native_trans(JavaThread *thread); |
| |
| bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); |
| bool is_ext_suspend_completed_with_lock(uint32_t *bits) { |
| MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
| // Warning: is_ext_suspend_completed() may temporarily drop the |
| // SR_lock to allow the thread to reach a stable thread state if |
| // it is currently in a transient thread state. |
| return is_ext_suspend_completed(false /*!called_by_wait */, |
| SuspendRetryDelay, bits); |
| } |
| |
| // We cannot allow wait_for_ext_suspend_completion() to run forever or |
| // we could hang. SuspendRetryCount and SuspendRetryDelay are normally |
| // passed as the count and delay parameters. Experiments with specific |
| // calls to wait_for_ext_suspend_completion() can be done by passing |
| // other values in the code. Experiments with all calls can be done |
| // via the appropriate -XX options. |
| bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); |
| |
| void set_external_suspend() { set_suspend_flag (_external_suspend); } |
| void clear_external_suspend() { clear_suspend_flag(_external_suspend); } |
| |
| void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } |
| void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } |
| bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } |
| |
| bool is_external_suspend() const { |
| return (_suspend_flags & _external_suspend) != 0; |
| } |
| // Whenever a thread transitions from native to vm/java it must suspend |
| // if external|deopt suspend is present. |
| bool is_suspend_after_native() const { |
| return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; |
| } |
| |
| // external suspend request is completed |
| bool is_ext_suspended() const { |
| return (_suspend_flags & _ext_suspended) != 0; |
| } |
| |
| // legacy method that checked for either external suspension or vm suspension |
| bool is_any_suspended() const { |
| return is_ext_suspended(); |
| } |
| |
| bool is_external_suspend_with_lock() const { |
| MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
| return is_external_suspend(); |
| } |
| |
| // Special method to handle a pending external suspend request |
| // when a suspend equivalent condition lifts. |
| bool handle_special_suspend_equivalent_condition() { |
| assert(is_suspend_equivalent(), |
| "should only be called in a suspend equivalence condition"); |
| MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
| bool ret = is_external_suspend(); |
| if (!ret) { |
| // not about to self-suspend so clear suspend equivalence |
| clear_suspend_equivalent(); |
| } |
| // implied else: |
| // We have a pending external suspend request so we leave the |
| // suspend_equivalent flag set until java_suspend_self() sets |
| // the ext_suspended flag and clears the suspend_equivalent |
| // flag. This insures that wait_for_ext_suspend_completion() |
| // will return consistent values. |
| return ret; |
| } |
| |
| bool is_any_suspended_with_lock() const { |
| MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
| return is_any_suspended(); |
| } |
| // utility methods to see if we are doing some kind of suspension |
| bool is_being_ext_suspended() const { |
| MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
| return is_ext_suspended() || is_external_suspend(); |
| } |
| |
| bool is_suspend_equivalent() const { return _suspend_equivalent; } |
| |
| void set_suspend_equivalent() { _suspend_equivalent = true; }; |
| void clear_suspend_equivalent() { _suspend_equivalent = false; }; |
| |
| // Thread.stop support |
| void send_thread_stop(oop throwable); |
| AsyncRequests clear_special_runtime_exit_condition() { |
| AsyncRequests x = _special_runtime_exit_condition; |
| _special_runtime_exit_condition = _no_async_condition; |
| return x; |
| } |
| |
| // Are any async conditions present? |
| bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } |
| |
| void check_and_handle_async_exceptions(bool check_unsafe_error = true); |
| |
| // these next two are also used for self-suspension and async exception support |
| void handle_special_runtime_exit_condition(bool check_asyncs = true); |
| |
| // Return true if JavaThread has an asynchronous condition or |
| // if external suspension is requested. |
| bool has_special_runtime_exit_condition() { |
| // We call is_external_suspend() last since external suspend should |
| // be less common. Because we don't use is_external_suspend_with_lock |
| // it is possible that we won't see an asynchronous external suspend |
| // request that has just gotten started, i.e., SR_lock grabbed but |
| // _external_suspend field change either not made yet or not visible |
| // yet. However, this is okay because the request is asynchronous and |
| // we will see the new flag value the next time through. It's also |
| // possible that the external suspend request is dropped after |
| // we have checked is_external_suspend(), we will recheck its value |
| // under SR_lock in java_suspend_self(). |
| return (_special_runtime_exit_condition != _no_async_condition) || |
| is_external_suspend() || is_deopt_suspend(); |
| } |
| |
| void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } |
| |
| void set_pending_async_exception(oop e) { |
| _pending_async_exception = e; |
| _special_runtime_exit_condition = _async_exception; |
| set_has_async_exception(); |
| } |
| |
| // Fast-locking support |
| bool is_lock_owned(address adr) const; |
| |
| // Accessors for vframe array top |
| // The linked list of vframe arrays are sorted on sp. This means when we |
| // unpack the head must contain the vframe array to unpack. |
| void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } |
| vframeArray* vframe_array_head() const { return _vframe_array_head; } |
| |
| // Side structure for defering update of java frame locals until deopt occurs |
| GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } |
| void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } |
| |
| // These only really exist to make debugging deopt problems simpler |
| |
| void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } |
| vframeArray* vframe_array_last() const { return _vframe_array_last; } |
| |
| // The special resourceMark used during deoptimization |
| |
| void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } |
| DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } |
| |
| intptr_t* must_deopt_id() { return _must_deopt_id; } |
| void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } |
| void clear_must_deopt_id() { _must_deopt_id = NULL; } |
| |
| methodOop callee_target() const { return _callee_target; } |
| void set_callee_target (methodOop x) { _callee_target = x; } |
| |
| // Oop results of vm runtime calls |
| oop vm_result() const { return _vm_result; } |
| void set_vm_result (oop x) { _vm_result = x; } |
| |
| oop vm_result_2() const { return _vm_result_2; } |
| void set_vm_result_2 (oop x) { _vm_result_2 = x; } |
| |
| // Exception handling for compiled methods |
| oop exception_oop() const { return _exception_oop; } |
| int exception_stack_size() const { return _exception_stack_size; } |
| address exception_pc() const { return _exception_pc; } |
| address exception_handler_pc() const { return _exception_handler_pc; } |
| |
| void set_exception_oop(oop o) { _exception_oop = o; } |
| void set_exception_pc(address a) { _exception_pc = a; } |
| void set_exception_handler_pc(address a) { _exception_handler_pc = a; } |
| void set_exception_stack_size(int size) { _exception_stack_size = size; } |
| |
| // Stack overflow support |
| inline size_t stack_available(address cur_sp); |
| address stack_yellow_zone_base() |
| { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } |
| size_t stack_yellow_zone_size() |
| { return StackYellowPages * os::vm_page_size(); } |
| address stack_red_zone_base() |
| { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } |
| size_t stack_red_zone_size() |
| { return StackRedPages * os::vm_page_size(); } |
| bool in_stack_yellow_zone(address a) |
| { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } |
| bool in_stack_red_zone(address a) |
| { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } |
| |
| void create_stack_guard_pages(); |
| void remove_stack_guard_pages(); |
| |
| void enable_stack_yellow_zone(); |
| void disable_stack_yellow_zone(); |
| void enable_stack_red_zone(); |
| void disable_stack_red_zone(); |
| |
| inline bool stack_yellow_zone_disabled(); |
| inline bool stack_yellow_zone_enabled(); |
| |
| // Attempt to reguard the stack after a stack overflow may have occurred. |
| // Returns true if (a) guard pages are not needed on this thread, (b) the |
| // pages are already guarded, or (c) the pages were successfully reguarded. |
| // Returns false if there is not enough stack space to reguard the pages, in |
| // which case the caller should unwind a frame and try again. The argument |
| // should be the caller's (approximate) sp. |
| bool reguard_stack(address cur_sp); |
| // Similar to above but see if current stackpoint is out of the guard area |
| // and reguard if possible. |
| bool reguard_stack(void); |
| |
| // Misc. accessors/mutators |
| void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } |
| void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } |
| bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } |
| |
| #ifndef PRODUCT |
| void record_jump(address target, address instr, const char* file, int line); |
| #endif /* PRODUCT */ |
| |
| // For assembly stub generation |
| static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } |
| #ifndef PRODUCT |
| static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } |
| static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } |
| #endif /* PRODUCT */ |
| static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } |
| static ByteSize last_Java_sp_offset() { |
| return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); |
| } |
| static ByteSize last_Java_pc_offset() { |
| return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); |
| } |
| static ByteSize frame_anchor_offset() { |
| return byte_offset_of(JavaThread, _anchor); |
| } |
| static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } |
| static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } |
| static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } |
| static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } |
| static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } |
| static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } |
| static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } |
| static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } |
| static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } |
| static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); } |
| static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
| static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } |
| |
| static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } |
| |
| #ifndef SERIALGC |
| static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } |
| static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } |
| #endif // !SERIALGC |
| |
| // Returns the jni environment for this thread |
| JNIEnv* jni_environment() { return &_jni_environment; } |
| |
| static JavaThread* thread_from_jni_environment(JNIEnv* env) { |
| JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); |
| // Only return NULL if thread is off the thread list; starting to |
| // exit should not return NULL. |
| if (thread_from_jni_env->is_terminated()) { |
| thread_from_jni_env->block_if_vm_exited(); |
| return NULL; |
| } else { |
| return thread_from_jni_env; |
| } |
| } |
| |
| // JNI critical regions. These can nest. |
| bool in_critical() { return _jni_active_critical > 0; } |
| void enter_critical() { assert(Thread::current() == this, |
| "this must be current thread"); |
| _jni_active_critical++; } |
| void exit_critical() { assert(Thread::current() == this, |
| "this must be current thread"); |
| _jni_active_critical--; |
| assert(_jni_active_critical >= 0, |
| "JNI critical nesting problem?"); } |
| |
| // For deadlock detection |
| int depth_first_number() { return _depth_first_number; } |
| void set_depth_first_number(int dfn) { _depth_first_number = dfn; } |
| |
| private: |
| void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } |
| |
| public: |
| MonitorChunk* monitor_chunks() const { return _monitor_chunks; } |
| void add_monitor_chunk(MonitorChunk* chunk); |
| void remove_monitor_chunk(MonitorChunk* chunk); |
| bool in_deopt_handler() const { return _in_deopt_handler > 0; } |
| void inc_in_deopt_handler() { _in_deopt_handler++; } |
| void dec_in_deopt_handler() { |
| assert(_in_deopt_handler > 0, "mismatched deopt nesting"); |
| if (_in_deopt_handler > 0) { // robustness |
| _in_deopt_handler--; |
| } |
| } |
| |
| private: |
| void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } |
| |
| public: |
| |
| // Frame iteration; calls the function f for all frames on the stack |
| void frames_do(void f(frame*, const RegisterMap*)); |
| |
| // Memory operations |
| void oops_do(OopClosure* f); |
| |
| // Sweeper operations |
| void nmethods_do(); |
| |
| // Memory management operations |
| void gc_epilogue(); |
| void gc_prologue(); |
| |
| // Misc. operations |
| char* name() const { return (char*)get_thread_name(); } |
| void print_on(outputStream* st) const; |
| void print() const { print_on(tty); } |
| void print_value(); |
| void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; |
| void print_thread_state() const PRODUCT_RETURN; |
| void print_on_error(outputStream* st, char* buf, int buflen) const; |
| void verify(); |
| const char* get_thread_name() const; |
| private: |
| // factor out low-level mechanics for use in both normal and error cases |
| const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; |
| public: |
| const char* get_threadgroup_name() const; |
| const char* get_parent_name() const; |
| |
| // Accessing frames |
| frame last_frame() { |
| _anchor.make_walkable(this); |
| return pd_last_frame(); |
| } |
| javaVFrame* last_java_vframe(RegisterMap* reg_map); |
| |
| // Returns method at 'depth' java or native frames down the stack |
| // Used for security checks |
| klassOop security_get_caller_class(int depth); |
| |
| // Print stack trace in external format |
| void print_stack_on(outputStream* st); |
| void print_stack() { print_stack_on(tty); } |
| |
| // Print stack traces in various internal formats |
| void trace_stack() PRODUCT_RETURN; |
| void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; |
| void trace_frames() PRODUCT_RETURN; |
| |
| // Returns the number of stack frames on the stack |
| int depth() const; |
| |
| // Function for testing deoptimization |
| void deoptimize(); |
| void make_zombies(); |
| |
| void deoptimized_wrt_marked_nmethods(); |
| |
| // Profiling operation (see fprofile.cpp) |
| public: |
| bool profile_last_Java_frame(frame* fr); |
| |
| private: |
| ThreadProfiler* _thread_profiler; |
| private: |
| friend class FlatProfiler; // uses both [gs]et_thread_profiler. |
| friend class FlatProfilerTask; // uses get_thread_profiler. |
| friend class ThreadProfilerMark; // uses get_thread_profiler. |
| ThreadProfiler* get_thread_profiler() { return _thread_profiler; } |
| ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { |
| ThreadProfiler* result = _thread_profiler; |
| _thread_profiler = tp; |
| return result; |
| } |
| |
| // Static operations |
| public: |
| // Returns the running thread as a JavaThread |
| static inline JavaThread* current(); |
| |
| // Returns the active Java thread. Do not use this if you know you are calling |
| // from a JavaThread, as it's slower than JavaThread::current. If called from |
| // the VMThread, it also returns the JavaThread that instigated the VMThread's |
| // operation. You may not want that either. |
| static JavaThread* active(); |
| |
| inline CompilerThread* as_CompilerThread(); |
| |
| public: |
| virtual void run(); |
| void thread_main_inner(); |
| |
| private: |
| // PRIVILEGED STACK |
| PrivilegedElement* _privileged_stack_top; |
| GrowableArray<oop>* _array_for_gc; |
| public: |
| |
| // Returns the privileged_stack information. |
| PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } |
| void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } |
| void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } |
| |
| public: |
| // Thread local information maintained by JVMTI. |
| void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } |
| JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
| static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } |
| void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } |
| JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } |
| |
| // JVMTI PopFrame support |
| // Setting and clearing popframe_condition |
| // All of these enumerated values are bits. popframe_pending |
| // indicates that a PopFrame() has been requested and not yet been |
| // completed. popframe_processing indicates that that PopFrame() is in |
| // the process of being completed. popframe_force_deopt_reexecution_bit |
| // indicates that special handling is required when returning to a |
| // deoptimized caller. |
| enum PopCondition { |
| popframe_inactive = 0x00, |
| popframe_pending_bit = 0x01, |
| popframe_processing_bit = 0x02, |
| popframe_force_deopt_reexecution_bit = 0x04 |
| }; |
| PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } |
| void set_popframe_condition(PopCondition c) { _popframe_condition = c; } |
| void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } |
| void clear_popframe_condition() { _popframe_condition = popframe_inactive; } |
| static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } |
| bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } |
| bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } |
| void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } |
| #ifdef CC_INTERP |
| bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } |
| void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } |
| bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } |
| void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } |
| void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } |
| #endif |
| |
| private: |
| // Saved incoming arguments to popped frame. |
| // Used only when popped interpreted frame returns to deoptimized frame. |
| void* _popframe_preserved_args; |
| int _popframe_preserved_args_size; |
| |
| public: |
| void popframe_preserve_args(ByteSize size_in_bytes, void* start); |
| void* popframe_preserved_args(); |
| ByteSize popframe_preserved_args_size(); |
| WordSize popframe_preserved_args_size_in_words(); |
| void popframe_free_preserved_args(); |
| |
| |
| private: |
| JvmtiThreadState *_jvmti_thread_state; |
| JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; |
| |
| // Used by the interpreter in fullspeed mode for frame pop, method |
| // entry, method exit and single stepping support. This field is |
| // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. |
| // It can be set to zero asynchronously (i.e., without a VM operation |
| // or a lock) so we have to be very careful. |
| int _interp_only_mode; |
| |
| public: |
| // used by the interpreter for fullspeed debugging support (see above) |
| static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } |
| bool is_interp_only_mode() { return (_interp_only_mode != 0); } |
| int get_interp_only_mode() { return _interp_only_mode; } |
| void increment_interp_only_mode() { ++_interp_only_mode; } |
| void decrement_interp_only_mode() { --_interp_only_mode; } |
| |
| private: |
| ThreadStatistics *_thread_stat; |
| |
| public: |
| ThreadStatistics* get_thread_stat() const { return _thread_stat; } |
| |
| // Return a blocker object for which this thread is blocked parking. |
| oop current_park_blocker(); |
| |
| private: |
| static size_t _stack_size_at_create; |
| |
| public: |
| static inline size_t stack_size_at_create(void) { |
| return _stack_size_at_create; |
| } |
| static inline void set_stack_size_at_create(size_t value) { |
| _stack_size_at_create = value; |
| } |
| |
| #ifndef SERIALGC |
| // SATB marking queue support |
| ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } |
| static SATBMarkQueueSet& satb_mark_queue_set() { |
| return _satb_mark_queue_set; |
| } |
| |
| // Dirty card queue support |
| DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } |
| static DirtyCardQueueSet& dirty_card_queue_set() { |
| return _dirty_card_queue_set; |
| } |
| #endif // !SERIALGC |
| |
| // Machine dependent stuff |
| #include "incls/_thread_pd.hpp.incl" |
| |
| public: |
| void set_blocked_on_compilation(bool value) { |
| _blocked_on_compilation = value; |
| } |
| |
| bool blocked_on_compilation() { |
| return _blocked_on_compilation; |
| } |
| protected: |
| bool _blocked_on_compilation; |
| |
| |
| // JSR166 per-thread parker |
| private: |
| Parker* _parker; |
| public: |
| Parker* parker() { return _parker; } |
| |
| // Biased locking support |
| private: |
| GrowableArray<MonitorInfo*>* _cached_monitor_info; |
| public: |
| GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } |
| void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } |
| |
| // clearing/querying jni attach status |
| bool is_attaching() const { return _is_attaching; } |
| void set_attached() { _is_attaching = false; OrderAccess::fence(); } |
| private: |
| // This field is used to determine if a thread has claimed |
| // a par_id: it is -1 if the thread has not claimed a par_id; |
| // otherwise its value is the par_id that has been claimed. |
| int _claimed_par_id; |
| public: |
| int get_claimed_par_id() { return _claimed_par_id; } |
| void set_claimed_par_id(int id) { _claimed_par_id = id;} |
| }; |
| |
| // Inline implementation of JavaThread::current |
| inline JavaThread* JavaThread::current() { |
| Thread* thread = ThreadLocalStorage::thread(); |
| assert(thread != NULL && thread->is_Java_thread(), "just checking"); |
| return (JavaThread*)thread; |
| } |
| |
| inline CompilerThread* JavaThread::as_CompilerThread() { |
| assert(is_Compiler_thread(), "just checking"); |
| return (CompilerThread*)this; |
| } |
| |
| inline bool JavaThread::stack_yellow_zone_disabled() { |
| return _stack_guard_state == stack_guard_yellow_disabled; |
| } |
| |
| inline bool JavaThread::stack_yellow_zone_enabled() { |
| #ifdef ASSERT |
| if (os::uses_stack_guard_pages()) { |
| assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); |
| } |
| #endif |
| return _stack_guard_state == stack_guard_enabled; |
| } |
| |
| inline size_t JavaThread::stack_available(address cur_sp) { |
| // This code assumes java stacks grow down |
| address low_addr; // Limit on the address for deepest stack depth |
| if ( _stack_guard_state == stack_guard_unused) { |
| low_addr = stack_base() - stack_size(); |
| } else { |
| low_addr = stack_yellow_zone_base(); |
| } |
| return cur_sp > low_addr ? cur_sp - low_addr : 0; |
| } |
| |
| // A JavaThread for low memory detection support |
| class LowMemoryDetectorThread : public JavaThread { |
| friend class VMStructs; |
| public: |
| LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; |
| |
| // Hide this thread from external view. |
| bool is_hidden_from_external_view() const { return true; } |
| }; |
| |
| // A thread used for Compilation. |
| class CompilerThread : public JavaThread { |
| friend class VMStructs; |
| private: |
| CompilerCounters* _counters; |
| |
| ciEnv* _env; |
| CompileLog* _log; |
| CompileTask* _task; |
| CompileQueue* _queue; |
| |
| public: |
| |
| static CompilerThread* current(); |
| |
| CompilerThread(CompileQueue* queue, CompilerCounters* counters); |
| |
| bool is_Compiler_thread() const { return true; } |
| // Hide this compiler thread from external view. |
| bool is_hidden_from_external_view() const { return true; } |
| |
| CompileQueue* queue() { return _queue; } |
| CompilerCounters* counters() { return _counters; } |
| |
| // Get/set the thread's compilation environment. |
| ciEnv* env() { return _env; } |
| void set_env(ciEnv* env) { _env = env; } |
| |
| // Get/set the thread's logging information |
| CompileLog* log() { return _log; } |
| void init_log(CompileLog* log) { |
| // Set once, for good. |
| assert(_log == NULL, "set only once"); |
| _log = log; |
| } |
| |
| #ifndef PRODUCT |
| private: |
| IdealGraphPrinter *_ideal_graph_printer; |
| public: |
| IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } |
| void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } |
| #endif |
| |
| // Get/set the thread's current task |
| CompileTask* task() { return _task; } |
| void set_task(CompileTask* task) { _task = task; } |
| }; |
| |
| inline CompilerThread* CompilerThread::current() { |
| return JavaThread::current()->as_CompilerThread(); |
| } |
| |
| |
| // The active thread queue. It also keeps track of the current used |
| // thread priorities. |
| class Threads: AllStatic { |
| friend class VMStructs; |
| private: |
| static JavaThread* _thread_list; |
| static int _number_of_threads; |
| static int _number_of_non_daemon_threads; |
| static int _return_code; |
| |
| public: |
| // Thread management |
| // force_daemon is a concession to JNI, where we may need to add a |
| // thread to the thread list before allocating its thread object |
| static void add(JavaThread* p, bool force_daemon = false); |
| static void remove(JavaThread* p); |
| static bool includes(JavaThread* p); |
| static JavaThread* first() { return _thread_list; } |
| static void threads_do(ThreadClosure* tc); |
| |
| // Initializes the vm and creates the vm thread |
| static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); |
| static void convert_vm_init_libraries_to_agents(); |
| static void create_vm_init_libraries(); |
| static void create_vm_init_agents(); |
| static void shutdown_vm_agents(); |
| static bool destroy_vm(); |
| // Supported VM versions via JNI |
| // Includes JNI_VERSION_1_1 |
| static jboolean is_supported_jni_version_including_1_1(jint version); |
| // Does not include JNI_VERSION_1_1 |
| static jboolean is_supported_jni_version(jint version); |
| |
| // Garbage collection |
| static void follow_other_roots(void f(oop*)); |
| |
| // Apply "f->do_oop" to all root oops in all threads. |
| // This version may only be called by sequential code. |
| static void oops_do(OopClosure* f); |
| // This version may be called by sequential or parallel code. |
| static void possibly_parallel_oops_do(OopClosure* f); |
| // This creates a list of GCTasks, one per thread. |
| static void create_thread_roots_tasks(GCTaskQueue* q); |
| // This creates a list of GCTasks, one per thread, for marking objects. |
| static void create_thread_roots_marking_tasks(GCTaskQueue* q); |
| |
| // Apply "f->do_oop" to roots in all threads that |
| // are part of compiled frames |
| static void compiled_frame_oops_do(OopClosure* f); |
| |
| static void convert_hcode_pointers(); |
| static void restore_hcode_pointers(); |
| |
| // Sweeper |
| static void nmethods_do(); |
| |
| static void gc_epilogue(); |
| static void gc_prologue(); |
| |
| // Verification |
| static void verify(); |
| static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); |
| static void print(bool print_stacks, bool internal_format) { |
| // this function is only used by debug.cpp |
| print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); |
| } |
| static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); |
| |
| // Get Java threads that are waiting to enter a monitor. If doLock |
| // is true, then Threads_lock is grabbed as needed. Otherwise, the |
| // VM needs to be at a safepoint. |
| static GrowableArray<JavaThread*>* get_pending_threads(int count, |
| address monitor, bool doLock); |
| |
| // Get owning Java thread from the monitor's owner field. If doLock |
| // is true, then Threads_lock is grabbed as needed. Otherwise, the |
| // VM needs to be at a safepoint. |
| static JavaThread *owning_thread_from_monitor_owner(address owner, |
| bool doLock); |
| |
| // Number of threads on the active threads list |
| static int number_of_threads() { return _number_of_threads; } |
| // Number of non-daemon threads on the active threads list |
| static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } |
| |
| // Deoptimizes all frames tied to marked nmethods |
| static void deoptimized_wrt_marked_nmethods(); |
| |
| }; |
| |
| |
| // Thread iterator |
| class ThreadClosure: public StackObj { |
| public: |
| virtual void do_thread(Thread* thread) = 0; |
| }; |
| |
| class SignalHandlerMark: public StackObj { |
| private: |
| Thread* _thread; |
| public: |
| SignalHandlerMark(Thread* t) { |
| _thread = t; |
| if (_thread) _thread->enter_signal_handler(); |
| } |
| ~SignalHandlerMark() { |
| if (_thread) _thread->leave_signal_handler(); |
| _thread = NULL; |
| } |
| }; |
| |
| // ParkEvents are type-stable and immortal. |
| // |
| // Lifecycle: Once a ParkEvent is associated with a thread that ParkEvent remains |
| // associated with the thread for the thread's entire lifetime - the relationship is |
| // stable. A thread will be associated at most one ParkEvent. When the thread |
| // expires, the ParkEvent moves to the EventFreeList. New threads attempt to allocate from |
| // the EventFreeList before creating a new Event. Type-stability frees us from |
| // worrying about stale Event or Thread references in the objectMonitor subsystem. |
| // (A reference to ParkEvent is always valid, even though the event may no longer be associated |
| // with the desired or expected thread. A key aspect of this design is that the callers of |
| // park, unpark, etc must tolerate stale references and spurious wakeups). |
| // |
| // Only the "associated" thread can block (park) on the ParkEvent, although |
| // any other thread can unpark a reachable parkevent. Park() is allowed to |
| // return spuriously. In fact park-unpark a really just an optimization to |
| // avoid unbounded spinning and surrender the CPU to be a polite system citizen. |
| // A degenerate albeit "impolite" park-unpark implementation could simply return. |
| // See http://blogs.sun.com/dave for more details. |
| // |
| // Eventually I'd like to eliminate Events and ObjectWaiters, both of which serve as |
| // thread proxies, and simply make the THREAD structure type-stable and persistent. |
| // Currently, we unpark events associated with threads, but ideally we'd just |
| // unpark threads. |
| // |
| // The base-class, PlatformEvent, is platform-specific while the ParkEvent is |
| // platform-independent. PlatformEvent provides park(), unpark(), etc., and |
| // is abstract -- that is, a PlatformEvent should never be instantiated except |
| // as part of a ParkEvent. |
| // Equivalently we could have defined a platform-independent base-class that |
| // exported Allocate(), Release(), etc. The platform-specific class would extend |
| // that base-class, adding park(), unpark(), etc. |
| // |
| // A word of caution: The JVM uses 2 very similar constructs: |
| // 1. ParkEvent are used for Java-level "monitor" synchronization. |
| // 2. Parkers are used by JSR166-JUC park-unpark. |
| // |
| // We'll want to eventually merge these redundant facilities and use ParkEvent. |
| |
| |
| class ParkEvent : public os::PlatformEvent { |
| private: |
| ParkEvent * FreeNext ; |
| |
| // Current association |
| Thread * AssociatedWith ; |
| intptr_t RawThreadIdentity ; // LWPID etc |
| volatile int Incarnation ; |
| |
| // diagnostic : keep track of last thread to wake this thread. |
| // this is useful for construction of dependency graphs. |
| void * LastWaker ; |
| |
| public: |
| // MCS-CLH list linkage and Native Mutex/Monitor |
| ParkEvent * volatile ListNext ; |
| ParkEvent * volatile ListPrev ; |
| volatile intptr_t OnList ; |
| volatile int TState ; |
| volatile int Notified ; // for native monitor construct |
| volatile int IsWaiting ; // Enqueued on WaitSet |
| |
| |
| private: |
| static ParkEvent * volatile FreeList ; |
| static volatile int ListLock ; |
| |
| // It's prudent to mark the dtor as "private" |
| // ensuring that it's not visible outside the package. |
| // Unfortunately gcc warns about such usage, so |
| // we revert to the less desirable "protected" visibility. |
| // The other compilers accept private dtors. |
| |
| protected: // Ensure dtor is never invoked |
| ~ParkEvent() { guarantee (0, "invariant") ; } |
| |
| ParkEvent() : PlatformEvent() { |
| AssociatedWith = NULL ; |
| FreeNext = NULL ; |
| ListNext = NULL ; |
| ListPrev = NULL ; |
| OnList = 0 ; |
| TState = 0 ; |
| Notified = 0 ; |
| IsWaiting = 0 ; |
| } |
| |
| // We use placement-new to force ParkEvent instances to be |
| // aligned on 256-byte address boundaries. This ensures that the least |
| // significant byte of a ParkEvent address is always 0. |
| |
| void * operator new (size_t sz) ; |
| void operator delete (void * a) ; |
| |
| public: |
| static ParkEvent * Allocate (Thread * t) ; |
| static void Release (ParkEvent * e) ; |
| } ; |