339 lines
18 KiB
C++
339 lines
18 KiB
C++
/*
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* Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/os.inline.hpp"
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#include "runtime/safepoint.hpp"
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#include "runtime/thread.inline.hpp"
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#include "runtime/vmThread.hpp"
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// Mutexes used in the VM (see comment in mutexLocker.hpp):
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//
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// Note that the following pointers are effectively final -- after having been
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// set at JVM startup-time, they should never be subsequently mutated.
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// Instead of using pointers to malloc()ed monitors and mutexes we should consider
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// eliminating the indirection and using instances instead.
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// Consider using GCC's __read_mostly.
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Mutex* Patching_lock = NULL;
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Monitor* SystemDictionary_lock = NULL;
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Mutex* Module_lock = NULL;
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Mutex* CompiledIC_lock = NULL;
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Mutex* InlineCacheBuffer_lock = NULL;
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Mutex* VMStatistic_lock = NULL;
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Mutex* JNIGlobalAlloc_lock = NULL;
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Mutex* JNIGlobalActive_lock = NULL;
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Mutex* JNIWeakAlloc_lock = NULL;
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Mutex* JNIWeakActive_lock = NULL;
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Mutex* JNIHandleBlockFreeList_lock = NULL;
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Mutex* VMWeakAlloc_lock = NULL;
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Mutex* VMWeakActive_lock = NULL;
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Mutex* ResolvedMethodTable_lock = NULL;
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Mutex* JmethodIdCreation_lock = NULL;
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Mutex* JfieldIdCreation_lock = NULL;
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Monitor* JNICritical_lock = NULL;
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Mutex* JvmtiThreadState_lock = NULL;
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Monitor* Heap_lock = NULL;
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Mutex* ExpandHeap_lock = NULL;
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Mutex* AdapterHandlerLibrary_lock = NULL;
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Mutex* SignatureHandlerLibrary_lock = NULL;
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Mutex* VtableStubs_lock = NULL;
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Mutex* SymbolTable_lock = NULL;
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Mutex* StringTable_lock = NULL;
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Monitor* StringDedupQueue_lock = NULL;
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Mutex* StringDedupTable_lock = NULL;
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Monitor* CodeCache_lock = NULL;
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Mutex* MethodData_lock = NULL;
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Mutex* TouchedMethodLog_lock = NULL;
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Mutex* RetData_lock = NULL;
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Monitor* VMOperationQueue_lock = NULL;
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Monitor* VMOperationRequest_lock = NULL;
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Monitor* Safepoint_lock = NULL;
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Monitor* SerializePage_lock = NULL;
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Monitor* Threads_lock = NULL;
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Monitor* CGC_lock = NULL;
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Monitor* STS_lock = NULL;
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Monitor* FullGCCount_lock = NULL;
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Mutex* SATB_Q_FL_lock = NULL;
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Monitor* SATB_Q_CBL_mon = NULL;
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Mutex* Shared_SATB_Q_lock = NULL;
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Mutex* DirtyCardQ_FL_lock = NULL;
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Monitor* DirtyCardQ_CBL_mon = NULL;
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Mutex* Shared_DirtyCardQ_lock = NULL;
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Mutex* MarkStackFreeList_lock = NULL;
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Mutex* MarkStackChunkList_lock = NULL;
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Mutex* ParGCRareEvent_lock = NULL;
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Mutex* DerivedPointerTableGC_lock = NULL;
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Monitor* CGCPhaseManager_lock = NULL;
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Mutex* Compile_lock = NULL;
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Monitor* MethodCompileQueue_lock = NULL;
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Monitor* CompileThread_lock = NULL;
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Monitor* Compilation_lock = NULL;
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Mutex* CompileTaskAlloc_lock = NULL;
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Mutex* CompileStatistics_lock = NULL;
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Mutex* DirectivesStack_lock = NULL;
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Mutex* MultiArray_lock = NULL;
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Monitor* Terminator_lock = NULL;
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Monitor* BeforeExit_lock = NULL;
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Monitor* Notify_lock = NULL;
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Mutex* ProfilePrint_lock = NULL;
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Mutex* ExceptionCache_lock = NULL;
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Mutex* OsrList_lock = NULL;
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#ifndef PRODUCT
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Mutex* FullGCALot_lock = NULL;
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#endif
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Mutex* Debug1_lock = NULL;
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Mutex* Debug2_lock = NULL;
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Mutex* Debug3_lock = NULL;
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Mutex* tty_lock = NULL;
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Mutex* RawMonitor_lock = NULL;
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Mutex* PerfDataMemAlloc_lock = NULL;
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Mutex* PerfDataManager_lock = NULL;
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Mutex* OopMapCacheAlloc_lock = NULL;
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Mutex* FreeList_lock = NULL;
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Mutex* OldSets_lock = NULL;
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Monitor* RootRegionScan_lock = NULL;
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Monitor* GCTaskManager_lock = NULL;
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Mutex* Management_lock = NULL;
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Monitor* Service_lock = NULL;
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Monitor* PeriodicTask_lock = NULL;
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Monitor* RedefineClasses_lock = NULL;
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#if INCLUDE_TRACE
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Mutex* JfrStacktrace_lock = NULL;
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Monitor* JfrMsg_lock = NULL;
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Mutex* JfrBuffer_lock = NULL;
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Mutex* JfrStream_lock = NULL;
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#endif
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#ifndef SUPPORTS_NATIVE_CX8
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Mutex* UnsafeJlong_lock = NULL;
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#endif
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Monitor* CodeHeapStateAnalytics_lock = NULL;
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Mutex* MetaspaceExpand_lock = NULL;
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#define MAX_NUM_MUTEX 128
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static Monitor * _mutex_array[MAX_NUM_MUTEX];
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static int _num_mutex;
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#ifdef ASSERT
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void assert_locked_or_safepoint(const Monitor * lock) {
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// check if this thread owns the lock (common case)
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if (IgnoreLockingAssertions) return;
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assert(lock != NULL, "Need non-NULL lock");
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if (lock->owned_by_self()) return;
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if (SafepointSynchronize::is_at_safepoint()) return;
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if (!Universe::is_fully_initialized()) return;
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// see if invoker of VM operation owns it
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VM_Operation* op = VMThread::vm_operation();
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if (op != NULL && op->calling_thread() == lock->owner()) return;
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fatal("must own lock %s", lock->name());
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}
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// a stronger assertion than the above
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void assert_lock_strong(const Monitor * lock) {
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if (IgnoreLockingAssertions) return;
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assert(lock != NULL, "Need non-NULL lock");
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if (lock->owned_by_self()) return;
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fatal("must own lock %s", lock->name());
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}
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#endif
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#define def(var, type, pri, vm_block, safepoint_check_allowed ) { \
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var = new type(Mutex::pri, #var, vm_block, safepoint_check_allowed); \
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assert(_num_mutex < MAX_NUM_MUTEX, "increase MAX_NUM_MUTEX"); \
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_mutex_array[_num_mutex++] = var; \
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}
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// Using Padded subclasses to prevent false sharing of these global monitors and mutexes.
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void mutex_init() {
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def(tty_lock , PaddedMutex , event, true, Monitor::_safepoint_check_never); // allow to lock in VM
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def(CGC_lock , PaddedMonitor, special, true, Monitor::_safepoint_check_never); // coordinate between fore- and background GC
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def(STS_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_never);
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def(VMWeakAlloc_lock , PaddedMutex , vmweak, true, Monitor::_safepoint_check_never);
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def(VMWeakActive_lock , PaddedMutex , vmweak-1, true, Monitor::_safepoint_check_never);
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if (UseConcMarkSweepGC || UseG1GC) {
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def(FullGCCount_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_never); // in support of ExplicitGCInvokesConcurrent
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}
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if (UseG1GC) {
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def(SATB_Q_FL_lock , PaddedMutex , access, true, Monitor::_safepoint_check_never);
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def(SATB_Q_CBL_mon , PaddedMonitor, access, true, Monitor::_safepoint_check_never);
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def(Shared_SATB_Q_lock , PaddedMutex , access + 1, true, Monitor::_safepoint_check_never);
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def(DirtyCardQ_FL_lock , PaddedMutex , access, true, Monitor::_safepoint_check_never);
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def(DirtyCardQ_CBL_mon , PaddedMonitor, access, true, Monitor::_safepoint_check_never);
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def(Shared_DirtyCardQ_lock , PaddedMutex , access + 1, true, Monitor::_safepoint_check_never);
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def(FreeList_lock , PaddedMutex , leaf , true, Monitor::_safepoint_check_never);
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def(OldSets_lock , PaddedMutex , leaf , true, Monitor::_safepoint_check_never);
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def(RootRegionScan_lock , PaddedMonitor, leaf , true, Monitor::_safepoint_check_never);
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def(StringDedupQueue_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_never);
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def(StringDedupTable_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never);
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def(MarkStackFreeList_lock , PaddedMutex , leaf , true, Monitor::_safepoint_check_never);
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def(MarkStackChunkList_lock , PaddedMutex , leaf , true, Monitor::_safepoint_check_never);
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}
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def(ParGCRareEvent_lock , PaddedMutex , leaf , true, Monitor::_safepoint_check_sometimes);
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def(DerivedPointerTableGC_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never);
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def(CGCPhaseManager_lock , PaddedMonitor, leaf, false, Monitor::_safepoint_check_sometimes);
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def(CodeCache_lock , PaddedMutex , special, true, Monitor::_safepoint_check_never);
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def(RawMonitor_lock , PaddedMutex , special, true, Monitor::_safepoint_check_never);
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def(OopMapCacheAlloc_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always); // used for oop_map_cache allocation.
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def(MetaspaceExpand_lock , PaddedMutex , leaf-1, true, Monitor::_safepoint_check_never);
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def(Patching_lock , PaddedMutex , special, true, Monitor::_safepoint_check_never); // used for safepointing and code patching.
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def(Service_lock , PaddedMonitor, special, true, Monitor::_safepoint_check_never); // used for service thread operations
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def(JmethodIdCreation_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always); // used for creating jmethodIDs.
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def(SystemDictionary_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_always); // lookups done by VM thread
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def(Module_lock , PaddedMutex , leaf+2, true, Monitor::_safepoint_check_always);
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def(InlineCacheBuffer_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always);
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def(VMStatistic_lock , PaddedMutex , leaf, false, Monitor::_safepoint_check_always);
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def(ExpandHeap_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always); // Used during compilation by VM thread
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def(JNIHandleBlockFreeList_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never); // handles are used by VM thread
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def(SignatureHandlerLibrary_lock , PaddedMutex , leaf, false, Monitor::_safepoint_check_always);
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def(SymbolTable_lock , PaddedMutex , leaf+2, true, Monitor::_safepoint_check_always);
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def(StringTable_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always);
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def(ProfilePrint_lock , PaddedMutex , leaf, false, Monitor::_safepoint_check_always); // serial profile printing
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def(ExceptionCache_lock , PaddedMutex , leaf, false, Monitor::_safepoint_check_always); // serial profile printing
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def(OsrList_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never);
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def(Debug1_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never);
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#ifndef PRODUCT
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def(FullGCALot_lock , PaddedMutex , leaf, false, Monitor::_safepoint_check_always); // a lock to make FullGCALot MT safe
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#endif
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def(BeforeExit_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_always);
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def(PerfDataMemAlloc_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always); // used for allocating PerfData memory for performance data
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def(PerfDataManager_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always); // used for synchronized access to PerfDataManager resources
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// CMS_modUnionTable_lock leaf
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// CMS_bitMap_lock leaf 1
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// CMS_freeList_lock leaf 2
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def(Safepoint_lock , PaddedMonitor, safepoint, true, Monitor::_safepoint_check_sometimes); // locks SnippetCache_lock/Threads_lock
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def(Threads_lock , PaddedMonitor, barrier, true, Monitor::_safepoint_check_sometimes);
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def(VMOperationQueue_lock , PaddedMonitor, nonleaf, true, Monitor::_safepoint_check_sometimes); // VM_thread allowed to block on these
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def(VMOperationRequest_lock , PaddedMonitor, nonleaf, true, Monitor::_safepoint_check_sometimes);
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def(RetData_lock , PaddedMutex , nonleaf, false, Monitor::_safepoint_check_always);
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def(Terminator_lock , PaddedMonitor, nonleaf, true, Monitor::_safepoint_check_sometimes);
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def(VtableStubs_lock , PaddedMutex , nonleaf, true, Monitor::_safepoint_check_always);
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def(Notify_lock , PaddedMonitor, nonleaf, true, Monitor::_safepoint_check_always);
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// OopStorage-based JNI may lock the alloc_locks while releasing a handle,
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// while previous JNI didn't need a lock for handle release. This runs afoul
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// of some places which hold other locks while releasing a handle, including
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// the Patching_lock, which is of "special" rank. As a temporary workaround,
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// lower the JNI oopstorage lock ranks to make them super-special.
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def(JNIGlobalAlloc_lock , PaddedMutex , nonleaf, true, Monitor::_safepoint_check_never);
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def(JNIGlobalActive_lock , PaddedMutex , nonleaf-1, true, Monitor::_safepoint_check_never);
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def(JNIWeakAlloc_lock , PaddedMutex , nonleaf, true, Monitor::_safepoint_check_never);
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def(JNIWeakActive_lock , PaddedMutex , nonleaf-1, true, Monitor::_safepoint_check_never);
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def(JNICritical_lock , PaddedMonitor, nonleaf, true, Monitor::_safepoint_check_always); // used for JNI critical regions
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def(AdapterHandlerLibrary_lock , PaddedMutex , nonleaf, true, Monitor::_safepoint_check_always);
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def(Heap_lock , PaddedMonitor, nonleaf+1, false, Monitor::_safepoint_check_sometimes);
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def(JfieldIdCreation_lock , PaddedMutex , nonleaf+1, true, Monitor::_safepoint_check_always); // jfieldID, Used in VM_Operation
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def(ResolvedMethodTable_lock , PaddedMutex , nonleaf+1, false, Monitor::_safepoint_check_always); // Used to protect ResolvedMethodTable
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def(CompiledIC_lock , PaddedMutex , nonleaf+2, false, Monitor::_safepoint_check_always); // locks VtableStubs_lock, InlineCacheBuffer_lock
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def(CompileTaskAlloc_lock , PaddedMutex , nonleaf+2, true, Monitor::_safepoint_check_always);
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def(CompileStatistics_lock , PaddedMutex , nonleaf+2, false, Monitor::_safepoint_check_always);
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def(DirectivesStack_lock , PaddedMutex , special, true, Monitor::_safepoint_check_never);
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def(MultiArray_lock , PaddedMutex , nonleaf+2, false, Monitor::_safepoint_check_always); // locks SymbolTable_lock
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def(JvmtiThreadState_lock , PaddedMutex , nonleaf+2, false, Monitor::_safepoint_check_always); // Used by JvmtiThreadState/JvmtiEventController
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def(Management_lock , PaddedMutex , nonleaf+2, false, Monitor::_safepoint_check_always); // used for JVM management
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def(Compile_lock , PaddedMutex , nonleaf+3, true, Monitor::_safepoint_check_sometimes);
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def(MethodData_lock , PaddedMutex , nonleaf+3, false, Monitor::_safepoint_check_always);
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def(TouchedMethodLog_lock , PaddedMutex , nonleaf+3, false, Monitor::_safepoint_check_always);
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def(MethodCompileQueue_lock , PaddedMonitor, nonleaf+4, true, Monitor::_safepoint_check_always);
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def(Debug2_lock , PaddedMutex , nonleaf+4, true, Monitor::_safepoint_check_never);
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def(Debug3_lock , PaddedMutex , nonleaf+4, true, Monitor::_safepoint_check_never);
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def(CompileThread_lock , PaddedMonitor, nonleaf+5, false, Monitor::_safepoint_check_always);
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def(PeriodicTask_lock , PaddedMonitor, nonleaf+5, true, Monitor::_safepoint_check_sometimes);
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def(RedefineClasses_lock , PaddedMonitor, nonleaf+5, true, Monitor::_safepoint_check_always);
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if (WhiteBoxAPI) {
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def(Compilation_lock , PaddedMonitor, leaf, false, Monitor::_safepoint_check_never);
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}
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#if INCLUDE_TRACE
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def(JfrMsg_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_always);
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def(JfrBuffer_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never);
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def(JfrStream_lock , PaddedMutex , leaf+1, true, Monitor::_safepoint_check_never); // ensure to rank lower than 'safepoint'
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def(JfrStacktrace_lock , PaddedMutex , special, true, Monitor::_safepoint_check_sometimes);
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#endif
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#ifndef SUPPORTS_NATIVE_CX8
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def(UnsafeJlong_lock , PaddedMutex , special, false, Monitor::_safepoint_check_never);
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#endif
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def(CodeHeapStateAnalytics_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never);
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}
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GCMutexLocker::GCMutexLocker(Monitor * mutex) {
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if (SafepointSynchronize::is_at_safepoint()) {
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_locked = false;
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} else {
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_mutex = mutex;
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_locked = true;
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_mutex->lock();
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}
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}
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// Print all mutexes/monitors that are currently owned by a thread; called
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// by fatal error handler.
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void print_owned_locks_on_error(outputStream* st) {
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st->print("VM Mutex/Monitor currently owned by a thread: ");
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bool none = true;
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for (int i = 0; i < _num_mutex; i++) {
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// see if it has an owner
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if (_mutex_array[i]->owner() != NULL) {
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if (none) {
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// print format used by Mutex::print_on_error()
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st->print_cr(" ([mutex/lock_event])");
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none = false;
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}
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_mutex_array[i]->print_on_error(st);
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st->cr();
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}
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}
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if (none) st->print_cr("None");
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}
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