/*
* Copyright (c) 1997, 2012, 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/safepoint.hpp"
#include "runtime/threadLocalStorage.hpp"
#include "runtime/vmThread.hpp"
#ifdef TARGET_OS_FAMILY_linux
# include "thread_linux.inline.hpp"
#endif
#ifdef TARGET_OS_FAMILY_solaris
# include "thread_solaris.inline.hpp"
#endif
#ifdef TARGET_OS_FAMILY_windows
# include "thread_windows.inline.hpp"
#endif
#ifdef TARGET_OS_FAMILY_bsd
# include "thread_bsd.inline.hpp"
#endif
// 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* JNICachedItableIndex_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;
Mutex* 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;
Mutex* STS_init_lock = NULL;
Monitor* SLT_lock = NULL;
Monitor* iCMS_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;
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;
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;
Mutex* HotCardCache_lock = NULL;
Monitor* GCTaskManager_lock = NULL;
Mutex* Management_lock = NULL;
Monitor* Service_lock = NULL;
Mutex* Stacktrace_lock = NULL;
Monitor* JfrQuery_lock = NULL;
Monitor* JfrMsg_lock = NULL;
Mutex* JfrBuffer_lock = NULL;
Mutex* JfrStream_lock = NULL;
Monitor* PeriodicTask_lock = NULL;
#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) { \
var = new type(Mutex::pri, #var, vm_block); \
assert(_num_mutex < MAX_NUM_MUTEX, \
"increase MAX_NUM_MUTEX"); \
_mutex_array[_num_mutex++] = var; \
}
void mutex_init() {
def(tty_lock , Mutex , event, true ); // allow to lock in VM
def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC
def(STS_init_lock , Mutex, leaf, true );
if (UseConcMarkSweepGC) {
def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification
}
if (UseConcMarkSweepGC || UseG1GC) {
def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent
}
if (UseG1GC) {
def(CMark_lock , Monitor, nonleaf, true ); // coordinate concurrent mark thread
def(CMRegionStack_lock , Mutex, leaf, true );
def(SATB_Q_FL_lock , Mutex , special, true );
def(SATB_Q_CBL_mon , Monitor, nonleaf, true );
def(Shared_SATB_Q_lock , Mutex, nonleaf, true );
def(DirtyCardQ_FL_lock , Mutex , special, true );
def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true );
def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true );
def(FreeList_lock , Mutex, leaf , true );
def(SecondaryFreeList_lock , Monitor, leaf , true );
def(OldSets_lock , Mutex , leaf , true );
def(RootRegionScan_lock , Monitor, leaf , true );
def(MMUTracker_lock , Mutex , leaf , true );
def(HotCardCache_lock , Mutex , special , true );
def(EvacFailureStack_lock , Mutex , nonleaf , true );
}
def(ParGCRareEvent_lock , Mutex , leaf , true );
def(DerivedPointerTableGC_lock , Mutex, leaf, true );
def(CodeCache_lock , Mutex , special, true );
def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing
def(RawMonitor_lock , Mutex, special, true );
def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation.
def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching.
def(ObjAllocPost_lock , Monitor, special, false);
def(Service_lock , Monitor, special, true ); // used for service thread operations
def(Stacktrace_lock , Mutex, special, true ); // used for JFR stacktrace database
def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs.
def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread
def(PackageTable_lock , Mutex , leaf, false);
def(InlineCacheBuffer_lock , Mutex , leaf, true );
def(VMStatistic_lock , Mutex , leaf, false);
def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread
def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread
def(SignatureHandlerLibrary_lock , Mutex , leaf, false);
def(SymbolTable_lock , Mutex , leaf, true );
def(StringTable_lock , Mutex , leaf, true );
def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing
def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing
def(OsrList_lock , Mutex , leaf, true );
def(Debug1_lock , Mutex , leaf, true );
#ifndef PRODUCT
def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe
#endif
def(BeforeExit_lock , Monitor, leaf, true );
def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data
def(PerfDataManager_lock , Mutex , leaf, true ); // 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 ); // locks SnippetCache_lock/Threads_lock
def(Threads_lock , Monitor, barrier, true );
def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these
def(VMOperationRequest_lock , Monitor, nonleaf, true );
def(RetData_lock , Mutex , nonleaf, false);
def(Terminator_lock , Monitor, nonleaf, true );
def(VtableStubs_lock , Mutex , nonleaf, true );
def(Notify_lock , Monitor, nonleaf, true );
def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock
def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions
def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true);
if (UseConcMarkSweepGC) {
def(SLT_lock , Monitor, nonleaf, false );
// used in CMS GC for locking PLL lock
}
def(Heap_lock , Monitor, nonleaf+1, false);
def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation
def(JNICachedItableIndex_lock , Mutex , nonleaf+1, false); // Used to cache an itable index during JNI invoke
def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock
def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true );
def(CompileStatistics_lock , Mutex , nonleaf+2, false);
def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock
def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController
def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents
def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management
def(Compile_lock , Mutex , nonleaf+3, true );
def(MethodData_lock , Mutex , nonleaf+3, false);
def(MethodCompileQueue_lock , Monitor, nonleaf+4, true );
def(Debug2_lock , Mutex , nonleaf+4, true );
def(Debug3_lock , Mutex , nonleaf+4, true );
def(CompileThread_lock , Monitor, nonleaf+5, false );
def(JfrMsg_lock , Monitor, leaf, true);
def(JfrBuffer_lock , Mutex, nonleaf+1, true);
def(JfrStream_lock , Mutex, nonleaf+2, true);
def(PeriodicTask_lock , Monitor, nonleaf+5, true);
}
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");
}