| /* |
| * Copyright (c) 1997, 2019, Oracle and/or its affiliates. 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. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "memory/universe.hpp" |
| #include "runtime/mutexLocker.hpp" |
| #include "runtime/os.inline.hpp" |
| #include "runtime/safepoint.hpp" |
| #include "runtime/thread.inline.hpp" |
| #include "runtime/vmThread.hpp" |
| |
| // Mutexes used in the VM (see comment in mutexLocker.hpp): |
| // |
| // Note that the following pointers are effectively final -- after having been |
| // set at JVM startup-time, they should never be subsequently mutated. |
| // Instead of using pointers to malloc()ed monitors and mutexes we should consider |
| // eliminating the indirection and using instances instead. |
| // Consider using GCC's __read_mostly. |
| |
| Mutex* Patching_lock = NULL; |
| Mutex* CompiledMethod_lock = NULL; |
| Monitor* SystemDictionary_lock = NULL; |
| Mutex* ProtectionDomainSet_lock = NULL; |
| Mutex* SharedDictionary_lock = NULL; |
| Mutex* Module_lock = NULL; |
| Mutex* CompiledIC_lock = NULL; |
| Mutex* InlineCacheBuffer_lock = NULL; |
| Mutex* VMStatistic_lock = NULL; |
| Mutex* JNIHandleBlockFreeList_lock = NULL; |
| Mutex* JmethodIdCreation_lock = NULL; |
| Mutex* JfieldIdCreation_lock = NULL; |
| Monitor* JNICritical_lock = NULL; |
| Mutex* JvmtiThreadState_lock = NULL; |
| Monitor* Heap_lock = NULL; |
| Mutex* ExpandHeap_lock = NULL; |
| Mutex* AdapterHandlerLibrary_lock = NULL; |
| Mutex* SignatureHandlerLibrary_lock = NULL; |
| Mutex* VtableStubs_lock = NULL; |
| Mutex* SymbolArena_lock = NULL; |
| Monitor* StringDedupQueue_lock = NULL; |
| Mutex* StringDedupTable_lock = NULL; |
| Monitor* CodeCache_lock = NULL; |
| Mutex* MethodData_lock = NULL; |
| Mutex* TouchedMethodLog_lock = NULL; |
| Mutex* RetData_lock = NULL; |
| Monitor* VMOperationQueue_lock = NULL; |
| Monitor* VMOperationRequest_lock = NULL; |
| Monitor* Threads_lock = NULL; |
| Mutex* NonJavaThreadsList_lock = NULL; |
| Mutex* NonJavaThreadsListSync_lock = NULL; |
| Monitor* CGC_lock = NULL; |
| Monitor* STS_lock = NULL; |
| Monitor* FullGCCount_lock = NULL; |
| Monitor* DirtyCardQ_CBL_mon = NULL; |
| Mutex* Shared_DirtyCardQ_lock = NULL; |
| Mutex* MarkStackFreeList_lock = NULL; |
| Mutex* MarkStackChunkList_lock = NULL; |
| Mutex* MonitoringSupport_lock = NULL; |
| Mutex* ParGCRareEvent_lock = NULL; |
| Monitor* CGCPhaseManager_lock = NULL; |
| Mutex* Compile_lock = NULL; |
| Monitor* MethodCompileQueue_lock = NULL; |
| Monitor* CompileThread_lock = NULL; |
| Monitor* Compilation_lock = NULL; |
| Mutex* CompileTaskAlloc_lock = NULL; |
| Mutex* CompileStatistics_lock = NULL; |
| Mutex* DirectivesStack_lock = NULL; |
| Mutex* MultiArray_lock = NULL; |
| Monitor* Terminator_lock = NULL; |
| Monitor* InitCompleted_lock = NULL; |
| Monitor* BeforeExit_lock = NULL; |
| Monitor* Notify_lock = NULL; |
| Mutex* ProfilePrint_lock = NULL; |
| Mutex* ExceptionCache_lock = NULL; |
| Mutex* NMethodSweeperStats_lock = NULL; |
| #ifndef PRODUCT |
| Mutex* FullGCALot_lock = NULL; |
| #endif |
| |
| Mutex* Debug1_lock = NULL; |
| Mutex* Debug2_lock = NULL; |
| Mutex* Debug3_lock = NULL; |
| |
| Mutex* tty_lock = NULL; |
| |
| Mutex* RawMonitor_lock = NULL; |
| Mutex* PerfDataMemAlloc_lock = NULL; |
| Mutex* PerfDataManager_lock = NULL; |
| Mutex* OopMapCacheAlloc_lock = NULL; |
| |
| Mutex* FreeList_lock = NULL; |
| Mutex* OldSets_lock = NULL; |
| Monitor* RootRegionScan_lock = NULL; |
| |
| Mutex* Management_lock = NULL; |
| Monitor* Service_lock = NULL; |
| Monitor* Notification_lock = NULL; |
| Monitor* PeriodicTask_lock = NULL; |
| Monitor* RedefineClasses_lock = NULL; |
| Mutex* Verify_lock = NULL; |
| |
| #if INCLUDE_JFR |
| Mutex* JfrStacktrace_lock = NULL; |
| Monitor* JfrMsg_lock = NULL; |
| Mutex* JfrBuffer_lock = NULL; |
| Mutex* JfrStream_lock = NULL; |
| Monitor* JfrThreadSampler_lock = NULL; |
| #endif |
| |
| #ifndef SUPPORTS_NATIVE_CX8 |
| Mutex* UnsafeJlong_lock = NULL; |
| #endif |
| Mutex* CodeHeapStateAnalytics_lock = NULL; |
| |
| Mutex* MetaspaceExpand_lock = NULL; |
| Mutex* ClassLoaderDataGraph_lock = NULL; |
| Monitor* ThreadsSMRDelete_lock = NULL; |
| Mutex* ThreadIdTableCreate_lock = NULL; |
| Mutex* SharedDecoder_lock = NULL; |
| Mutex* DCmdFactory_lock = NULL; |
| #if INCLUDE_NMT |
| Mutex* NMTQuery_lock = NULL; |
| #endif |
| #if INCLUDE_CDS |
| #if INCLUDE_JVMTI |
| Mutex* CDSClassFileStream_lock = NULL; |
| #endif |
| Mutex* DumpTimeTable_lock = NULL; |
| #endif // INCLUDE_CDS |
| |
| #if INCLUDE_JVMCI |
| Monitor* JVMCI_lock = NULL; |
| #endif |
| |
| |
| #define MAX_NUM_MUTEX 128 |
| static Mutex* _mutex_array[MAX_NUM_MUTEX]; |
| static int _num_mutex; |
| |
| #ifdef ASSERT |
| void assert_locked_or_safepoint(const Mutex* lock) { |
| // check if this thread owns the lock (common case) |
| assert(lock != NULL, "Need non-NULL lock"); |
| if (lock->owned_by_self()) return; |
| if (SafepointSynchronize::is_at_safepoint()) return; |
| if (!Universe::is_fully_initialized()) return; |
| // see if invoker of VM operation owns it |
| VM_Operation* op = VMThread::vm_operation(); |
| if (op != NULL && op->calling_thread() == lock->owner()) return; |
| fatal("must own lock %s", lock->name()); |
| } |
| |
| // a weaker assertion than the above |
| void assert_locked_or_safepoint_weak(const Mutex* lock) { |
| assert(lock != NULL, "Need non-NULL lock"); |
| if (lock->is_locked()) return; |
| if (SafepointSynchronize::is_at_safepoint()) return; |
| if (!Universe::is_fully_initialized()) return; |
| fatal("must own lock %s", lock->name()); |
| } |
| |
| // a stronger assertion than the above |
| void assert_lock_strong(const Mutex* lock) { |
| assert(lock != NULL, "Need non-NULL lock"); |
| if (lock->owned_by_self()) return; |
| fatal("must own lock %s", lock->name()); |
| } |
| #endif |
| |
| #define def(var, type, pri, vm_block, safepoint_check_allowed ) { \ |
| var = new type(Mutex::pri, #var, vm_block, Mutex::safepoint_check_allowed); \ |
| assert(_num_mutex < MAX_NUM_MUTEX, "increase MAX_NUM_MUTEX"); \ |
| _mutex_array[_num_mutex++] = var; \ |
| } |
| |
| // Using Padded subclasses to prevent false sharing of these global monitors and mutexes. |
| void mutex_init() { |
| def(tty_lock , PaddedMutex , tty, true, _safepoint_check_never); // allow to lock in VM |
| |
| def(CGC_lock , PaddedMonitor, special, true, _safepoint_check_never); // coordinate between fore- and background GC |
| def(STS_lock , PaddedMonitor, leaf, true, _safepoint_check_never); |
| |
| def(FullGCCount_lock , PaddedMonitor, leaf, true, _safepoint_check_never); // in support of ExplicitGCInvokesConcurrent |
| if (UseG1GC) { |
| def(DirtyCardQ_CBL_mon , PaddedMonitor, access, true, _safepoint_check_never); |
| def(Shared_DirtyCardQ_lock , PaddedMutex , access + 1, true, _safepoint_check_never); |
| |
| def(FreeList_lock , PaddedMutex , leaf , true, _safepoint_check_never); |
| def(OldSets_lock , PaddedMutex , leaf , true, _safepoint_check_never); |
| def(RootRegionScan_lock , PaddedMonitor, leaf , true, _safepoint_check_never); |
| |
| def(StringDedupQueue_lock , PaddedMonitor, leaf, true, _safepoint_check_never); |
| def(StringDedupTable_lock , PaddedMutex , leaf, true, _safepoint_check_never); |
| |
| def(MarkStackFreeList_lock , PaddedMutex , leaf , true, _safepoint_check_never); |
| def(MarkStackChunkList_lock , PaddedMutex , leaf , true, _safepoint_check_never); |
| |
| def(MonitoringSupport_lock , PaddedMutex , native , true, _safepoint_check_never); // used for serviceability monitoring support |
| } |
| if (UseShenandoahGC) { |
| def(StringDedupQueue_lock , PaddedMonitor, leaf, true, _safepoint_check_never); |
| def(StringDedupTable_lock , PaddedMutex , leaf, true, _safepoint_check_never); |
| } |
| def(ParGCRareEvent_lock , PaddedMutex , leaf , true, _safepoint_check_always); |
| def(CGCPhaseManager_lock , PaddedMonitor, leaf, false, _safepoint_check_always); |
| def(CodeCache_lock , PaddedMonitor, special, true, _safepoint_check_never); |
| def(RawMonitor_lock , PaddedMutex , special, true, _safepoint_check_never); |
| def(OopMapCacheAlloc_lock , PaddedMutex , leaf, true, _safepoint_check_always); // used for oop_map_cache allocation. |
| |
| def(MetaspaceExpand_lock , PaddedMutex , leaf-1, true, _safepoint_check_never); |
| def(ClassLoaderDataGraph_lock , PaddedMutex , nonleaf, false, _safepoint_check_always); |
| |
| def(Patching_lock , PaddedMutex , special, true, _safepoint_check_never); // used for safepointing and code patching. |
| def(CompiledMethod_lock , PaddedMutex , special-1, true, _safepoint_check_never); |
| def(Service_lock , PaddedMonitor, special, true, _safepoint_check_never); // used for service thread operations |
| |
| if (UseNotificationThread) { |
| def(Notification_lock , PaddedMonitor, special, true, _safepoint_check_never); // used for notification thread operations |
| } else { |
| Notification_lock = Service_lock; |
| } |
| |
| def(JmethodIdCreation_lock , PaddedMutex , leaf, true, _safepoint_check_always); // used for creating jmethodIDs. |
| |
| def(SystemDictionary_lock , PaddedMonitor, leaf, true, _safepoint_check_always); |
| def(ProtectionDomainSet_lock , PaddedMutex , leaf-1, true, _safepoint_check_never); |
| def(SharedDictionary_lock , PaddedMutex , leaf, true, _safepoint_check_always); |
| def(Module_lock , PaddedMutex , leaf+2, false, _safepoint_check_always); |
| def(InlineCacheBuffer_lock , PaddedMutex , leaf, true, _safepoint_check_never); |
| def(VMStatistic_lock , PaddedMutex , leaf, false, _safepoint_check_always); |
| def(ExpandHeap_lock , PaddedMutex , leaf, true, _safepoint_check_always); // Used during compilation by VM thread |
| def(JNIHandleBlockFreeList_lock , PaddedMutex , leaf-1, true, _safepoint_check_never); // handles are used by VM thread |
| def(SignatureHandlerLibrary_lock , PaddedMutex , leaf, false, _safepoint_check_always); |
| def(SymbolArena_lock , PaddedMutex , leaf+2, true, _safepoint_check_never); |
| def(ProfilePrint_lock , PaddedMutex , leaf, false, _safepoint_check_always); // serial profile printing |
| def(ExceptionCache_lock , PaddedMutex , leaf, false, _safepoint_check_always); // serial profile printing |
| def(Debug1_lock , PaddedMutex , leaf, true, _safepoint_check_never); |
| #ifndef PRODUCT |
| def(FullGCALot_lock , PaddedMutex , leaf, false, _safepoint_check_always); // a lock to make FullGCALot MT safe |
| #endif |
| def(BeforeExit_lock , PaddedMonitor, leaf, true, _safepoint_check_always); |
| def(PerfDataMemAlloc_lock , PaddedMutex , leaf, true, _safepoint_check_always); // used for allocating PerfData memory for performance data |
| def(PerfDataManager_lock , PaddedMutex , leaf, true, _safepoint_check_always); // used for synchronized access to PerfDataManager resources |
| |
| // CMS_modUnionTable_lock leaf |
| // CMS_bitMap_lock leaf 1 |
| // CMS_freeList_lock leaf 2 |
| |
| def(Threads_lock , PaddedMonitor, barrier, true, _safepoint_check_always); // Used for safepoint protocol. |
| def(NonJavaThreadsList_lock , PaddedMutex, leaf, true, _safepoint_check_never); |
| def(NonJavaThreadsListSync_lock , PaddedMutex, leaf, true, _safepoint_check_never); |
| |
| def(VMOperationQueue_lock , PaddedMonitor, nonleaf, true, _safepoint_check_never); // VM_thread allowed to block on these |
| def(VMOperationRequest_lock , PaddedMonitor, nonleaf, true, _safepoint_check_always); |
| def(RetData_lock , PaddedMutex , nonleaf, false, _safepoint_check_always); |
| def(Terminator_lock , PaddedMonitor, nonleaf, true, _safepoint_check_always); |
| def(InitCompleted_lock , PaddedMonitor, leaf, true, _safepoint_check_never); |
| def(VtableStubs_lock , PaddedMutex , nonleaf, true, _safepoint_check_never); |
| def(Notify_lock , PaddedMonitor, nonleaf, true, _safepoint_check_always); |
| def(JNICritical_lock , PaddedMonitor, nonleaf, true, _safepoint_check_always); // used for JNI critical regions |
| def(AdapterHandlerLibrary_lock , PaddedMutex , nonleaf, true, _safepoint_check_always); |
| |
| def(Heap_lock , PaddedMonitor, nonleaf+1, false, _safepoint_check_sometimes); // Doesn't safepoint check during termination. |
| def(JfieldIdCreation_lock , PaddedMutex , nonleaf+1, true, _safepoint_check_always); // jfieldID, Used in VM_Operation |
| |
| def(CompiledIC_lock , PaddedMutex , nonleaf+2, false, _safepoint_check_never); // locks VtableStubs_lock, InlineCacheBuffer_lock |
| def(CompileTaskAlloc_lock , PaddedMutex , nonleaf+2, true, _safepoint_check_always); |
| def(CompileStatistics_lock , PaddedMutex , nonleaf+2, false, _safepoint_check_always); |
| def(DirectivesStack_lock , PaddedMutex , special, true, _safepoint_check_never); |
| def(MultiArray_lock , PaddedMutex , nonleaf+2, false, _safepoint_check_always); |
| |
| def(JvmtiThreadState_lock , PaddedMutex , nonleaf+2, false, _safepoint_check_always); // Used by JvmtiThreadState/JvmtiEventController |
| def(Management_lock , PaddedMutex , nonleaf+2, false, _safepoint_check_always); // used for JVM management |
| |
| def(Compile_lock , PaddedMutex , nonleaf+3, false, _safepoint_check_always); |
| def(MethodData_lock , PaddedMutex , nonleaf+3, false, _safepoint_check_always); |
| def(TouchedMethodLog_lock , PaddedMutex , nonleaf+3, false, _safepoint_check_always); |
| |
| def(MethodCompileQueue_lock , PaddedMonitor, nonleaf+4, false, _safepoint_check_always); |
| def(Debug2_lock , PaddedMutex , nonleaf+4, true, _safepoint_check_never); |
| def(Debug3_lock , PaddedMutex , nonleaf+4, true, _safepoint_check_never); |
| def(CompileThread_lock , PaddedMonitor, nonleaf+5, false, _safepoint_check_always); |
| def(PeriodicTask_lock , PaddedMonitor, nonleaf+5, true, _safepoint_check_always); |
| def(RedefineClasses_lock , PaddedMonitor, nonleaf+5, true, _safepoint_check_always); |
| def(Verify_lock , PaddedMutex, nonleaf+5, true, _safepoint_check_always); |
| |
| if (WhiteBoxAPI) { |
| def(Compilation_lock , PaddedMonitor, leaf, false, _safepoint_check_never); |
| } |
| |
| #if INCLUDE_JFR |
| def(JfrMsg_lock , PaddedMonitor, leaf, true, _safepoint_check_always); |
| def(JfrBuffer_lock , PaddedMutex , leaf, true, _safepoint_check_never); |
| def(JfrStream_lock , PaddedMutex , nonleaf + 1, false, _safepoint_check_always); |
| def(JfrStacktrace_lock , PaddedMutex , special, true, _safepoint_check_never); |
| def(JfrThreadSampler_lock , PaddedMonitor, leaf, true, _safepoint_check_never); |
| #endif |
| |
| #ifndef SUPPORTS_NATIVE_CX8 |
| def(UnsafeJlong_lock , PaddedMutex , special, false, _safepoint_check_never); |
| #endif |
| |
| def(CodeHeapStateAnalytics_lock , PaddedMutex , leaf, true, _safepoint_check_never); |
| def(NMethodSweeperStats_lock , PaddedMutex , special, true, _safepoint_check_never); |
| def(ThreadsSMRDelete_lock , PaddedMonitor, special, true, _safepoint_check_never); |
| def(ThreadIdTableCreate_lock , PaddedMutex , leaf, false, _safepoint_check_always); |
| def(SharedDecoder_lock , PaddedMutex , native, false, _safepoint_check_never); |
| def(DCmdFactory_lock , PaddedMutex , leaf, true, _safepoint_check_never); |
| #if INCLUDE_NMT |
| def(NMTQuery_lock , PaddedMutex , max_nonleaf, false, _safepoint_check_always); |
| #endif |
| #if INCLUDE_CDS |
| #if INCLUDE_JVMTI |
| def(CDSClassFileStream_lock , PaddedMutex , max_nonleaf, false, _safepoint_check_always); |
| #endif |
| def(DumpTimeTable_lock , PaddedMutex , leaf, true, _safepoint_check_never); |
| #endif // INCLUDE_CDS |
| |
| #if INCLUDE_JVMCI |
| def(JVMCI_lock , PaddedMonitor, nonleaf+2, true, _safepoint_check_always); |
| #endif |
| } |
| |
| GCMutexLocker::GCMutexLocker(Mutex* mutex) { |
| if (SafepointSynchronize::is_at_safepoint()) { |
| _locked = false; |
| } else { |
| _mutex = mutex; |
| _locked = true; |
| _mutex->lock(); |
| } |
| } |
| |
| // Print all mutexes/monitors that are currently owned by a thread; called |
| // by fatal error handler. |
| void print_owned_locks_on_error(outputStream* st) { |
| st->print("VM Mutex/Monitor currently owned by a thread: "); |
| bool none = true; |
| for (int i = 0; i < _num_mutex; i++) { |
| // see if it has an owner |
| if (_mutex_array[i]->owner() != NULL) { |
| if (none) { |
| // print format used by Mutex::print_on_error() |
| st->print_cr(" ([mutex/lock_event])"); |
| none = false; |
| } |
| _mutex_array[i]->print_on_error(st); |
| st->cr(); |
| } |
| } |
| if (none) st->print_cr("None"); |
| } |
