/* * Copyright (c) 1997, 2014, 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 "runtime/mutexLocker.hpp" #include "runtime/os.inline.hpp" #include "runtime/safepoint.hpp" #include "runtime/thread.inline.hpp" #include "runtime/threadLocalStorage.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; Monitor* SystemDictionary_lock = NULL; Mutex* PackageTable_lock = NULL; Mutex* CompiledIC_lock = NULL; Mutex* InlineCacheBuffer_lock = NULL; Mutex* VMStatistic_lock = NULL; Mutex* JNIGlobalHandle_lock = NULL; Mutex* JNIHandleBlockFreeList_lock = NULL; Mutex* MemberNameTable_lock = NULL; Mutex* JmethodIdCreation_lock = NULL; Mutex* JfieldIdCreation_lock = NULL; Monitor* JNICritical_lock = NULL; Mutex* JvmtiThreadState_lock = NULL; Monitor* JvmtiPendingEvent_lock = NULL; Monitor* Heap_lock = NULL; Mutex* ExpandHeap_lock = NULL; Mutex* AdapterHandlerLibrary_lock = NULL; Mutex* SignatureHandlerLibrary_lock = NULL; Mutex* VtableStubs_lock = NULL; Mutex* SymbolTable_lock = NULL; Mutex* StringTable_lock = NULL; Monitor* StringDedupQueue_lock = NULL; Mutex* StringDedupTable_lock = NULL; Monitor* CodeCache_lock = NULL; Mutex* MethodData_lock = NULL; Mutex* RetData_lock = NULL; Monitor* VMOperationQueue_lock = NULL; Monitor* VMOperationRequest_lock = NULL; Monitor* Safepoint_lock = NULL; Monitor* SerializePage_lock = NULL; Monitor* Threads_lock = NULL; Monitor* CGC_lock = NULL; Monitor* STS_lock = NULL; Monitor* SLT_lock = NULL; Monitor* FullGCCount_lock = NULL; Monitor* CMark_lock = NULL; Mutex* CMRegionStack_lock = NULL; Mutex* SATB_Q_FL_lock = NULL; Monitor* SATB_Q_CBL_mon = NULL; Mutex* Shared_SATB_Q_lock = NULL; Mutex* DirtyCardQ_FL_lock = NULL; Monitor* DirtyCardQ_CBL_mon = NULL; Mutex* Shared_DirtyCardQ_lock = NULL; Mutex* ParGCRareEvent_lock = NULL; Mutex* EvacFailureStack_lock = NULL; Mutex* DerivedPointerTableGC_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* MultiArray_lock = NULL; Monitor* Terminator_lock = NULL; Monitor* BeforeExit_lock = NULL; Monitor* Notify_lock = NULL; Monitor* Interrupt_lock = NULL; Monitor* ProfileVM_lock = NULL; Mutex* ProfilePrint_lock = NULL; Mutex* ExceptionCache_lock = NULL; Monitor* ObjAllocPost_lock = NULL; Mutex* OsrList_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; Monitor* SecondaryFreeList_lock = NULL; Mutex* OldSets_lock = NULL; Monitor* RootRegionScan_lock = NULL; Mutex* MMUTracker_lock = NULL; Monitor* GCTaskManager_lock = NULL; Mutex* Management_lock = NULL; Monitor* Service_lock = NULL; Monitor* PeriodicTask_lock = NULL; #ifdef INCLUDE_TRACE Mutex* JfrStacktrace_lock = NULL; Monitor* JfrMsg_lock = NULL; Mutex* JfrBuffer_lock = NULL; Mutex* JfrStream_lock = NULL; Mutex* JfrThreadGroups_lock = NULL; #endif #ifndef SUPPORTS_NATIVE_CX8 Mutex* UnsafeJlong_lock = NULL; #endif #define MAX_NUM_MUTEX 128 static Monitor * _mutex_array[MAX_NUM_MUTEX]; static int _num_mutex; #ifdef ASSERT void assert_locked_or_safepoint(const Monitor * lock) { // check if this thread owns the lock (common case) if (IgnoreLockingAssertions) return; 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(err_msg("must own lock %s", lock->name())); } // a stronger assertion than the above void assert_lock_strong(const Monitor * lock) { if (IgnoreLockingAssertions) return; assert(lock != NULL, "Need non-NULL lock"); if (lock->owned_by_self()) return; fatal(err_msg("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, safepoint_check_allowed); \ assert(_num_mutex < MAX_NUM_MUTEX, "increase MAX_NUM_MUTEX"); \ _mutex_array[_num_mutex] = var; \ } void mutex_init() { def(tty_lock , Mutex , event, true, Monitor::_safepoint_check_never); // allow to lock in VM def(CGC_lock , Monitor, special, true, Monitor::_safepoint_check_never); // coordinate between fore- and background GC def(STS_lock , Monitor, leaf, true, Monitor::_safepoint_check_never); if (UseConcMarkSweepGC || UseG1GC) { def(FullGCCount_lock , Monitor, leaf, true, Monitor::_safepoint_check_never); // in support of ExplicitGCInvokesConcurrent } if (UseG1GC) { def(CMark_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_never); // coordinate concurrent mark thread def(CMRegionStack_lock , Mutex, leaf, true, Monitor::_safepoint_check_never); def(SATB_Q_FL_lock , Mutex , special, true, Monitor::_safepoint_check_never); def(SATB_Q_CBL_mon , Monitor, nonleaf, true, Monitor::_safepoint_check_never); def(Shared_SATB_Q_lock , Mutex, nonleaf, true, Monitor::_safepoint_check_never); def(DirtyCardQ_FL_lock , Mutex , special, true, Monitor::_safepoint_check_never); def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true, Monitor::_safepoint_check_never); def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true, Monitor::_safepoint_check_never); def(FreeList_lock , Mutex, leaf , true, Monitor::_safepoint_check_never); def(SecondaryFreeList_lock , Monitor, leaf , true, Monitor::_safepoint_check_never); def(OldSets_lock , Mutex , leaf , true, Monitor::_safepoint_check_never); def(RootRegionScan_lock , Monitor, leaf , true, Monitor::_safepoint_check_never); def(MMUTracker_lock , Mutex , leaf , true, Monitor::_safepoint_check_never); def(EvacFailureStack_lock , Mutex , nonleaf , true, Monitor::_safepoint_check_never); def(StringDedupQueue_lock , Monitor, leaf, true, Monitor::_safepoint_check_never); def(StringDedupTable_lock , Mutex , leaf, true, Monitor::_safepoint_check_never); } def(ParGCRareEvent_lock , Mutex , leaf , true, Monitor::_safepoint_check_sometimes); def(DerivedPointerTableGC_lock , Mutex, leaf, true, Monitor::_safepoint_check_never); def(CodeCache_lock , Mutex , special, true, Monitor::_safepoint_check_never); def(Interrupt_lock , Monitor, special, true, Monitor::_safepoint_check_never); // used for interrupt processing def(RawMonitor_lock , Mutex, special, true, Monitor::_safepoint_check_never); def(OopMapCacheAlloc_lock , Mutex, leaf, true, Monitor::_safepoint_check_always); // used for oop_map_cache allocation. def(Patching_lock , Mutex , special, true, Monitor::_safepoint_check_never); // used for safepointing and code patching. def(ObjAllocPost_lock , Monitor, special, false, Monitor::_safepoint_check_never); def(Service_lock , Monitor, special, true, Monitor::_safepoint_check_never); // used for service thread operations def(JmethodIdCreation_lock , Mutex , leaf, true, Monitor::_safepoint_check_always); // used for creating jmethodIDs. def(SystemDictionary_lock , Monitor, leaf, true, Monitor::_safepoint_check_always); // lookups done by VM thread def(PackageTable_lock , Mutex , leaf, false, Monitor::_safepoint_check_always); def(InlineCacheBuffer_lock , Mutex , leaf, true, Monitor::_safepoint_check_always); def(VMStatistic_lock , Mutex , leaf, false, Monitor::_safepoint_check_always); def(ExpandHeap_lock , Mutex , leaf, true, Monitor::_safepoint_check_always); // Used during compilation by VM thread def(JNIHandleBlockFreeList_lock , Mutex , leaf, true, Monitor::_safepoint_check_never); // handles are used by VM thread def(SignatureHandlerLibrary_lock , Mutex , leaf, false, Monitor::_safepoint_check_always); def(SymbolTable_lock , Mutex , leaf+2, true, Monitor::_safepoint_check_always); def(StringTable_lock , Mutex , leaf, true, Monitor::_safepoint_check_always); def(ProfilePrint_lock , Mutex , leaf, false, Monitor::_safepoint_check_always); // serial profile printing def(ExceptionCache_lock , Mutex , leaf, false, Monitor::_safepoint_check_always); // serial profile printing def(OsrList_lock , Mutex , leaf, true, Monitor::_safepoint_check_never); def(Debug1_lock , Mutex , leaf, true, Monitor::_safepoint_check_never); #ifndef PRODUCT def(FullGCALot_lock , Mutex , leaf, false, Monitor::_safepoint_check_always); // a lock to make FullGCALot MT safe #endif def(BeforeExit_lock , Monitor, leaf, true, Monitor::_safepoint_check_always); def(PerfDataMemAlloc_lock , Mutex , leaf, true, Monitor::_safepoint_check_always); // used for allocating PerfData memory for performance data def(PerfDataManager_lock , Mutex , leaf, true, Monitor::_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(Safepoint_lock , Monitor, safepoint, true, Monitor::_safepoint_check_sometimes); // locks SnippetCache_lock/Threads_lock def(Threads_lock , Monitor, barrier, true, Monitor::_safepoint_check_sometimes); def(VMOperationQueue_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_sometimes); // VM_thread allowed to block on these def(VMOperationRequest_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_sometimes); def(RetData_lock , Mutex , nonleaf, false, Monitor::_safepoint_check_always); def(Terminator_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_sometimes); def(VtableStubs_lock , Mutex , nonleaf, true, Monitor::_safepoint_check_always); def(Notify_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_always); def(JNIGlobalHandle_lock , Mutex , nonleaf, true, Monitor::_safepoint_check_always); // locks JNIHandleBlockFreeList_lock def(JNICritical_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_always); // used for JNI critical regions def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true, Monitor::_safepoint_check_always); if (UseConcMarkSweepGC) { def(SLT_lock , Monitor, nonleaf, false, Monitor::_safepoint_check_never); // used in CMS GC for locking PLL lock } def(Heap_lock , Monitor, nonleaf+1, false, Monitor::_safepoint_check_sometimes); def(JfieldIdCreation_lock , Mutex , nonleaf+1, true, Monitor::_safepoint_check_always); // jfieldID, Used in VM_Operation def(MemberNameTable_lock , Mutex , nonleaf+1, false, Monitor::_safepoint_check_always); // Used to protect MemberNameTable def(CompiledIC_lock , Mutex , nonleaf+2, false, Monitor::_safepoint_check_always); // locks VtableStubs_lock, InlineCacheBuffer_lock def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true, Monitor::_safepoint_check_always); def(CompileStatistics_lock , Mutex , nonleaf+2, false, Monitor::_safepoint_check_always); def(MultiArray_lock , Mutex , nonleaf+2, false, Monitor::_safepoint_check_always); // locks SymbolTable_lock def(JvmtiThreadState_lock , Mutex , nonleaf+2, false, Monitor::_safepoint_check_always); // Used by JvmtiThreadState/JvmtiEventController def(JvmtiPendingEvent_lock , Monitor, nonleaf, false, Monitor::_safepoint_check_never); // Used by JvmtiCodeBlobEvents def(Management_lock , Mutex , nonleaf+2, false, Monitor::_safepoint_check_always); // used for JVM management def(Compile_lock , Mutex , nonleaf+3, true, Monitor::_safepoint_check_sometimes); def(MethodData_lock , Mutex , nonleaf+3, false, Monitor::_safepoint_check_always); def(MethodCompileQueue_lock , Monitor, nonleaf+4, true, Monitor::_safepoint_check_always); def(Debug2_lock , Mutex , nonleaf+4, true, Monitor::_safepoint_check_never); def(Debug3_lock , Mutex , nonleaf+4, true, Monitor::_safepoint_check_never); def(ProfileVM_lock , Monitor, special, false, Monitor::_safepoint_check_never); // used for profiling of the VMThread def(CompileThread_lock , Monitor, nonleaf+5, false, Monitor::_safepoint_check_always); def(PeriodicTask_lock , Monitor, nonleaf+5, true, Monitor::_safepoint_check_sometimes); if (WhiteBoxAPI) { def(Compilation_lock , Monitor, leaf, false, Monitor::_safepoint_check_never); } #ifdef INCLUDE_TRACE def(JfrMsg_lock , Monitor, leaf, true, Monitor::_safepoint_check_always); def(JfrBuffer_lock , Mutex, leaf, true, Monitor::_safepoint_check_never); def(JfrThreadGroups_lock , Mutex, leaf, true, Monitor::_safepoint_check_always); def(JfrStream_lock , Mutex, nonleaf, true, Monitor::_safepoint_check_never); def(JfrStacktrace_lock , Mutex, special, true, Monitor::_safepoint_check_sometimes); #endif #ifndef SUPPORTS_NATIVE_CX8 def(UnsafeJlong_lock , Mutex, special, false, Monitor::_safepoint_check_never); #endif } GCMutexLocker::GCMutexLocker(Monitor * 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"); }