1 /* 2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "incls/_precompiled.incl" 26 #include "incls/_mutexLocker.cpp.incl" 27 28 // Mutexes used in the VM (see comment in mutexLocker.hpp): 29 // 30 // Note that the following pointers are effectively final -- after having been 31 // set at JVM startup-time, they should never be subsequently mutated. 32 // Instead of using pointers to malloc()ed monitors and mutexes we should consider 33 // eliminating the indirection and using instances instead. 34 // Consider using GCC's __read_mostly. 35 36 Mutex* Patching_lock = NULL; 37 Monitor* SystemDictionary_lock = NULL; 38 Mutex* PackageTable_lock = NULL; 39 Mutex* CompiledIC_lock = NULL; 40 Mutex* InlineCacheBuffer_lock = NULL; 41 Mutex* VMStatistic_lock = NULL; 42 Mutex* JNIGlobalHandle_lock = NULL; 43 Mutex* JNIHandleBlockFreeList_lock = NULL; 44 Mutex* JNICachedItableIndex_lock = NULL; 45 Mutex* JmethodIdCreation_lock = NULL; 46 Mutex* JfieldIdCreation_lock = NULL; 47 Monitor* JNICritical_lock = NULL; 48 Mutex* JvmtiThreadState_lock = NULL; 49 Monitor* JvmtiPendingEvent_lock = NULL; 50 Monitor* Heap_lock = NULL; 51 Mutex* ExpandHeap_lock = NULL; 52 Mutex* AdapterHandlerLibrary_lock = NULL; 53 Mutex* SignatureHandlerLibrary_lock = NULL; 54 Mutex* VtableStubs_lock = NULL; 55 Mutex* SymbolTable_lock = NULL; 56 Mutex* StringTable_lock = NULL; 57 Mutex* CodeCache_lock = NULL; 58 Mutex* MethodData_lock = NULL; 59 Mutex* RetData_lock = NULL; 60 Monitor* VMOperationQueue_lock = NULL; 61 Monitor* VMOperationRequest_lock = NULL; 62 Monitor* Safepoint_lock = NULL; 63 Monitor* SerializePage_lock = NULL; 64 Monitor* Threads_lock = NULL; 65 Monitor* CGC_lock = NULL; 66 Mutex* STS_init_lock = NULL; 67 Monitor* SLT_lock = NULL; 68 Monitor* iCMS_lock = NULL; 69 Monitor* FullGCCount_lock = NULL; 70 Monitor* CMark_lock = NULL; 71 Monitor* ZF_mon = NULL; 72 Monitor* Cleanup_mon = NULL; 73 Mutex* CMRegionStack_lock = NULL; 74 Mutex* SATB_Q_FL_lock = NULL; 75 Monitor* SATB_Q_CBL_mon = NULL; 76 Mutex* Shared_SATB_Q_lock = NULL; 77 Mutex* DirtyCardQ_FL_lock = NULL; 78 Monitor* DirtyCardQ_CBL_mon = NULL; 79 Mutex* Shared_DirtyCardQ_lock = NULL; 80 Mutex* ParGCRareEvent_lock = NULL; 81 Mutex* EvacFailureStack_lock = NULL; 82 Mutex* DerivedPointerTableGC_lock = NULL; 83 Mutex* Compile_lock = NULL; 84 Monitor* MethodCompileQueue_lock = NULL; 85 Monitor* CompileThread_lock = NULL; 86 Mutex* CompileTaskAlloc_lock = NULL; 87 Mutex* CompileStatistics_lock = NULL; 88 Mutex* MultiArray_lock = NULL; 89 Monitor* Terminator_lock = NULL; 90 Monitor* BeforeExit_lock = NULL; 91 Monitor* Notify_lock = NULL; 92 Monitor* Interrupt_lock = NULL; 93 Monitor* ProfileVM_lock = NULL; 94 Mutex* ProfilePrint_lock = NULL; 95 Mutex* ExceptionCache_lock = NULL; 96 Monitor* ObjAllocPost_lock = NULL; 97 Mutex* OsrList_lock = NULL; 98 #ifndef PRODUCT 99 Mutex* FullGCALot_lock = NULL; 100 #endif 101 102 Mutex* Debug1_lock = NULL; 103 Mutex* Debug2_lock = NULL; 104 Mutex* Debug3_lock = NULL; 105 106 Mutex* tty_lock = NULL; 107 108 Mutex* RawMonitor_lock = NULL; 109 Mutex* PerfDataMemAlloc_lock = NULL; 110 Mutex* PerfDataManager_lock = NULL; 111 Mutex* OopMapCacheAlloc_lock = NULL; 112 113 Mutex* MMUTracker_lock = NULL; 114 Mutex* HotCardCache_lock = NULL; 115 116 Monitor* GCTaskManager_lock = NULL; 117 118 Mutex* Management_lock = NULL; 119 Monitor* LowMemory_lock = NULL; 120 121 #define MAX_NUM_MUTEX 128 122 static Monitor * _mutex_array[MAX_NUM_MUTEX]; 123 static int _num_mutex; 124 125 #ifdef ASSERT 126 void assert_locked_or_safepoint(const Monitor * lock) { 127 // check if this thread owns the lock (common case) 128 if (IgnoreLockingAssertions) return; 129 assert(lock != NULL, "Need non-NULL lock"); 130 if (lock->owned_by_self()) return; 131 if (SafepointSynchronize::is_at_safepoint()) return; 132 if (!Universe::is_fully_initialized()) return; 133 // see if invoker of VM operation owns it 134 VM_Operation* op = VMThread::vm_operation(); 135 if (op != NULL && op->calling_thread() == lock->owner()) return; 136 fatal(err_msg("must own lock %s", lock->name())); 137 } 138 139 // a stronger assertion than the above 140 void assert_lock_strong(const Monitor * lock) { 141 if (IgnoreLockingAssertions) return; 142 assert(lock != NULL, "Need non-NULL lock"); 143 if (lock->owned_by_self()) return; 144 fatal(err_msg("must own lock %s", lock->name())); 145 } 146 #endif 147 148 #define def(var, type, pri, vm_block) { \ 149 var = new type(Mutex::pri, #var, vm_block); \ 150 assert(_num_mutex < MAX_NUM_MUTEX, \ 151 "increase MAX_NUM_MUTEX"); \ 152 _mutex_array[_num_mutex++] = var; \ 153 } 154 155 void mutex_init() { 156 def(tty_lock , Mutex , event, true ); // allow to lock in VM 157 158 def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC 159 def(STS_init_lock , Mutex, leaf, true ); 160 if (UseConcMarkSweepGC) { 161 def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification 162 } 163 if (UseConcMarkSweepGC || UseG1GC) { 164 def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent 165 } 166 if (UseG1GC) { 167 def(CMark_lock , Monitor, nonleaf, true ); // coordinate concurrent mark thread 168 def(ZF_mon , Monitor, leaf, true ); 169 def(Cleanup_mon , Monitor, nonleaf, true ); 170 def(CMRegionStack_lock , Mutex, leaf, true ); 171 def(SATB_Q_FL_lock , Mutex , special, true ); 172 def(SATB_Q_CBL_mon , Monitor, nonleaf, true ); 173 def(Shared_SATB_Q_lock , Mutex, nonleaf, true ); 174 175 def(DirtyCardQ_FL_lock , Mutex , special, true ); 176 def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true ); 177 def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true ); 178 179 def(MMUTracker_lock , Mutex , leaf , true ); 180 def(HotCardCache_lock , Mutex , special , true ); 181 def(EvacFailureStack_lock , Mutex , nonleaf , true ); 182 } 183 def(ParGCRareEvent_lock , Mutex , leaf , true ); 184 def(DerivedPointerTableGC_lock , Mutex, leaf, true ); 185 def(CodeCache_lock , Mutex , special, true ); 186 def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing 187 def(RawMonitor_lock , Mutex, special, true ); 188 def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation. 189 190 def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching. 191 def(ObjAllocPost_lock , Monitor, special, false); 192 def(LowMemory_lock , Monitor, special, true ); // used for low memory detection 193 def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs. 194 195 def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread 196 def(PackageTable_lock , Mutex , leaf, false); 197 def(InlineCacheBuffer_lock , Mutex , leaf, true ); 198 def(VMStatistic_lock , Mutex , leaf, false); 199 def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread 200 def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread 201 def(SignatureHandlerLibrary_lock , Mutex , leaf, false); 202 def(SymbolTable_lock , Mutex , leaf, true ); 203 def(StringTable_lock , Mutex , leaf, true ); 204 def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing 205 def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing 206 def(OsrList_lock , Mutex , leaf, true ); 207 def(Debug1_lock , Mutex , leaf, true ); 208 #ifndef PRODUCT 209 def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe 210 #endif 211 def(BeforeExit_lock , Monitor, leaf, true ); 212 def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data 213 def(PerfDataManager_lock , Mutex , leaf, true ); // used for synchronized access to PerfDataManager resources 214 215 // CMS_modUnionTable_lock leaf 216 // CMS_bitMap_lock leaf + 1 217 // CMS_freeList_lock leaf + 2 218 219 def(Safepoint_lock , Monitor, safepoint, true ); // locks SnippetCache_lock/Threads_lock 220 221 def(Threads_lock , Monitor, barrier, true ); 222 223 def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these 224 def(VMOperationRequest_lock , Monitor, nonleaf, true ); 225 def(RetData_lock , Mutex , nonleaf, false); 226 def(Terminator_lock , Monitor, nonleaf, true ); 227 def(VtableStubs_lock , Mutex , nonleaf, true ); 228 def(Notify_lock , Monitor, nonleaf, true ); 229 def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock 230 def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions 231 def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true); 232 if (UseConcMarkSweepGC) { 233 def(SLT_lock , Monitor, nonleaf, false ); 234 // used in CMS GC for locking PLL lock 235 } 236 def(Heap_lock , Monitor, nonleaf+1, false); 237 def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation 238 def(JNICachedItableIndex_lock , Mutex , nonleaf+1, false); // Used to cache an itable index during JNI invoke 239 240 def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock 241 def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true ); 242 def(CompileStatistics_lock , Mutex , nonleaf+2, false); 243 def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock 244 245 def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController 246 def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents 247 def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management 248 249 def(Compile_lock , Mutex , nonleaf+3, true ); 250 def(MethodData_lock , Mutex , nonleaf+3, false); 251 252 def(MethodCompileQueue_lock , Monitor, nonleaf+4, true ); 253 def(Debug2_lock , Mutex , nonleaf+4, true ); 254 def(Debug3_lock , Mutex , nonleaf+4, true ); 255 def(ProfileVM_lock , Monitor, nonleaf+4, false); // used for profiling of the VMThread 256 def(CompileThread_lock , Monitor, nonleaf+5, false ); 257 } 258 259 GCMutexLocker::GCMutexLocker(Monitor * mutex) { 260 if (SafepointSynchronize::is_at_safepoint()) { 261 _locked = false; 262 } else { 263 _mutex = mutex; 264 _locked = true; 265 _mutex->lock(); 266 } 267 } 268 269 // Print all mutexes/monitors that are currently owned by a thread; called 270 // by fatal error handler. 271 void print_owned_locks_on_error(outputStream* st) { 272 st->print("VM Mutex/Monitor currently owned by a thread: "); 273 bool none = true; 274 for (int i = 0; i < _num_mutex; i++) { 275 // see if it has an owner 276 if (_mutex_array[i]->owner() != NULL) { 277 if (none) { 278 // print format used by Mutex::print_on_error() 279 st->print_cr(" ([mutex/lock_event])"); 280 none = false; 281 } 282 _mutex_array[i]->print_on_error(st); 283 st->cr(); 284 } 285 } 286 if (none) st->print_cr("None"); 287 }