1 /* 2 * Copyright (c) 1997, 2014, 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 "precompiled.hpp" 26 #include "runtime/mutexLocker.hpp" 27 #include "runtime/safepoint.hpp" 28 #include "runtime/thread.inline.hpp" 29 #include "runtime/threadLocalStorage.hpp" 30 #include "runtime/vmThread.hpp" 31 32 // Mutexes used in the VM (see comment in mutexLocker.hpp): 33 // 34 // Note that the following pointers are effectively final -- after having been 35 // set at JVM startup-time, they should never be subsequently mutated. 36 // Instead of using pointers to malloc()ed monitors and mutexes we should consider 37 // eliminating the indirection and using instances instead. 38 // Consider using GCC's __read_mostly. 39 40 Mutex* Patching_lock = NULL; 41 Monitor* SystemDictionary_lock = NULL; 42 Mutex* PackageTable_lock = NULL; 43 Mutex* CompiledIC_lock = NULL; 44 Mutex* InlineCacheBuffer_lock = NULL; 45 Mutex* VMStatistic_lock = NULL; 46 Mutex* JNIGlobalHandle_lock = NULL; 47 Mutex* JNIHandleBlockFreeList_lock = NULL; 48 Mutex* MemberNameTable_lock = NULL; 49 Mutex* JmethodIdCreation_lock = NULL; 50 Mutex* JfieldIdCreation_lock = NULL; 51 Monitor* JNICritical_lock = NULL; 52 Mutex* JvmtiThreadState_lock = NULL; 53 Monitor* JvmtiPendingEvent_lock = NULL; 54 Monitor* Heap_lock = NULL; 55 Mutex* ExpandHeap_lock = NULL; 56 Mutex* AdapterHandlerLibrary_lock = NULL; 57 Mutex* SignatureHandlerLibrary_lock = NULL; 58 Mutex* VtableStubs_lock = NULL; 59 Mutex* SymbolTable_lock = NULL; 60 Mutex* StringTable_lock = NULL; 61 Monitor* StringDedupQueue_lock = NULL; 62 Mutex* StringDedupTable_lock = NULL; 63 Mutex* CodeCache_lock = NULL; 64 Mutex* MethodData_lock = NULL; 65 Mutex* RetData_lock = NULL; 66 Monitor* VMOperationQueue_lock = NULL; 67 Monitor* VMOperationRequest_lock = NULL; 68 Monitor* Safepoint_lock = NULL; 69 Monitor* SerializePage_lock = NULL; 70 Monitor* Threads_lock = NULL; 71 Monitor* CGC_lock = NULL; 72 Monitor* STS_lock = NULL; 73 Monitor* SLT_lock = NULL; 74 Monitor* iCMS_lock = NULL; 75 Monitor* FullGCCount_lock = NULL; 76 Monitor* CMark_lock = NULL; 77 Mutex* CMRegionStack_lock = NULL; 78 Mutex* SATB_Q_FL_lock = NULL; 79 Monitor* SATB_Q_CBL_mon = NULL; 80 Mutex* Shared_SATB_Q_lock = NULL; 81 Mutex* DirtyCardQ_FL_lock = NULL; 82 Monitor* DirtyCardQ_CBL_mon = NULL; 83 Mutex* Shared_DirtyCardQ_lock = NULL; 84 Mutex* ParGCRareEvent_lock = NULL; 85 Mutex* EvacFailureStack_lock = NULL; 86 Mutex* DerivedPointerTableGC_lock = NULL; 87 Mutex* Compile_lock = NULL; 88 Monitor* MethodCompileQueue_lock = NULL; 89 Monitor* CompileThread_lock = NULL; 90 Mutex* CompileTaskAlloc_lock = NULL; 91 Mutex* CompileStatistics_lock = NULL; 92 Mutex* MultiArray_lock = NULL; 93 Monitor* Terminator_lock = NULL; 94 Monitor* BeforeExit_lock = NULL; 95 Monitor* Notify_lock = NULL; 96 Monitor* Interrupt_lock = NULL; 97 Monitor* ProfileVM_lock = NULL; 98 Mutex* ProfilePrint_lock = NULL; 99 Mutex* ExceptionCache_lock = NULL; 100 Monitor* ObjAllocPost_lock = NULL; 101 Mutex* OsrList_lock = NULL; 102 #ifndef PRODUCT 103 Mutex* FullGCALot_lock = NULL; 104 #endif 105 106 Mutex* Debug1_lock = NULL; 107 Mutex* Debug2_lock = NULL; 108 Mutex* Debug3_lock = NULL; 109 110 Mutex* tty_lock = NULL; 111 112 Mutex* RawMonitor_lock = NULL; 113 Mutex* PerfDataMemAlloc_lock = NULL; 114 Mutex* PerfDataManager_lock = NULL; 115 Mutex* OopMapCacheAlloc_lock = NULL; 116 117 Mutex* FreeList_lock = NULL; 118 Monitor* SecondaryFreeList_lock = NULL; 119 Mutex* OldSets_lock = NULL; 120 Monitor* RootRegionScan_lock = NULL; 121 Mutex* MMUTracker_lock = NULL; 122 Mutex* HotCardCache_lock = NULL; 123 124 Monitor* GCTaskManager_lock = NULL; 125 126 Mutex* Management_lock = NULL; 127 Monitor* Service_lock = NULL; 128 Monitor* PeriodicTask_lock = NULL; 129 130 #ifdef INCLUDE_TRACE 131 Mutex* JfrStacktrace_lock = NULL; 132 Monitor* JfrMsg_lock = NULL; 133 Mutex* JfrBuffer_lock = NULL; 134 Mutex* JfrStream_lock = NULL; 135 Mutex* JfrThreadGroups_lock = NULL; 136 #endif 137 138 #ifndef SUPPORTS_NATIVE_CX8 139 Mutex* UnsafeJlong_lock = NULL; 140 #endif 141 142 #define MAX_NUM_MUTEX 128 143 static Monitor * _mutex_array[MAX_NUM_MUTEX]; 144 static int _num_mutex; 145 146 #ifdef ASSERT 147 void assert_locked_or_safepoint(const Monitor * lock) { 148 // check if this thread owns the lock (common case) 149 if (IgnoreLockingAssertions) return; 150 assert(lock != NULL, "Need non-NULL lock"); 151 if (lock->owned_by_self()) return; 152 if (SafepointSynchronize::is_at_safepoint()) return; 153 if (!Universe::is_fully_initialized()) return; 154 // see if invoker of VM operation owns it 155 VM_Operation* op = VMThread::vm_operation(); 156 if (op != NULL && op->calling_thread() == lock->owner()) return; 157 fatal(err_msg("must own lock %s", lock->name())); 158 } 159 160 // a stronger assertion than the above 161 void assert_lock_strong(const Monitor * lock) { 162 if (IgnoreLockingAssertions) return; 163 assert(lock != NULL, "Need non-NULL lock"); 164 if (lock->owned_by_self()) return; 165 fatal(err_msg("must own lock %s", lock->name())); 166 } 167 #endif 168 169 #define def(var, type, pri, vm_block) { \ 170 var = new type(Mutex::pri, #var, vm_block); \ 171 assert(_num_mutex < MAX_NUM_MUTEX, \ 172 "increase MAX_NUM_MUTEX"); \ 173 _mutex_array[_num_mutex++] = var; \ 174 } 175 176 void mutex_init() { 177 def(tty_lock , Mutex , event, true ); // allow to lock in VM 178 179 def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC 180 def(STS_lock , Monitor, leaf, true ); 181 if (UseConcMarkSweepGC) { 182 def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification 183 } 184 if (UseConcMarkSweepGC || UseG1GC) { 185 def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent 186 } 187 if (UseG1GC) { 188 def(CMark_lock , Monitor, nonleaf, true ); // coordinate concurrent mark thread 189 def(CMRegionStack_lock , Mutex, leaf, true ); 190 def(SATB_Q_FL_lock , Mutex , special, true ); 191 def(SATB_Q_CBL_mon , Monitor, nonleaf, true ); 192 def(Shared_SATB_Q_lock , Mutex, nonleaf, true ); 193 194 def(DirtyCardQ_FL_lock , Mutex , special, true ); 195 def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true ); 196 def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true ); 197 198 def(FreeList_lock , Mutex, leaf , true ); 199 def(SecondaryFreeList_lock , Monitor, leaf , true ); 200 def(OldSets_lock , Mutex , leaf , true ); 201 def(RootRegionScan_lock , Monitor, leaf , true ); 202 def(MMUTracker_lock , Mutex , leaf , true ); 203 def(HotCardCache_lock , Mutex , special , true ); 204 def(EvacFailureStack_lock , Mutex , nonleaf , true ); 205 206 def(StringDedupQueue_lock , Monitor, leaf, true ); 207 def(StringDedupTable_lock , Mutex , leaf, true ); 208 } 209 def(ParGCRareEvent_lock , Mutex , leaf , true ); 210 def(DerivedPointerTableGC_lock , Mutex, leaf, true ); 211 def(CodeCache_lock , Mutex , special, true ); 212 def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing 213 def(RawMonitor_lock , Mutex, special, true ); 214 def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation. 215 216 def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching. 217 def(ObjAllocPost_lock , Monitor, special, false); 218 def(Service_lock , Monitor, special, true ); // used for service thread operations 219 def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs. 220 221 def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread 222 def(PackageTable_lock , Mutex , leaf, false); 223 def(InlineCacheBuffer_lock , Mutex , leaf, true ); 224 def(VMStatistic_lock , Mutex , leaf, false); 225 def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread 226 def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread 227 def(SignatureHandlerLibrary_lock , Mutex , leaf, false); 228 def(SymbolTable_lock , Mutex , leaf+2, true ); 229 def(StringTable_lock , Mutex , leaf, true ); 230 def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing 231 def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing 232 def(OsrList_lock , Mutex , leaf, true ); 233 def(Debug1_lock , Mutex , leaf, true ); 234 #ifndef PRODUCT 235 def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe 236 #endif 237 def(BeforeExit_lock , Monitor, leaf, true ); 238 def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data 239 def(PerfDataManager_lock , Mutex , leaf, true ); // used for synchronized access to PerfDataManager resources 240 241 // CMS_modUnionTable_lock leaf 242 // CMS_bitMap_lock leaf + 1 243 // CMS_freeList_lock leaf + 2 244 245 def(Safepoint_lock , Monitor, safepoint, true ); // locks SnippetCache_lock/Threads_lock 246 247 def(Threads_lock , Monitor, barrier, true ); 248 249 def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these 250 def(VMOperationRequest_lock , Monitor, nonleaf, true ); 251 def(RetData_lock , Mutex , nonleaf, false); 252 def(Terminator_lock , Monitor, nonleaf, true ); 253 def(VtableStubs_lock , Mutex , nonleaf, true ); 254 def(Notify_lock , Monitor, nonleaf, true ); 255 def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock 256 def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions 257 def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true); 258 if (UseConcMarkSweepGC) { 259 def(SLT_lock , Monitor, nonleaf, false ); 260 // used in CMS GC for locking PLL lock 261 } 262 def(Heap_lock , Monitor, nonleaf+1, false); 263 def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation 264 def(MemberNameTable_lock , Mutex , nonleaf+1, false); // Used to protect MemberNameTable 265 266 def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock 267 def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true ); 268 def(CompileStatistics_lock , Mutex , nonleaf+2, false); 269 def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock 270 271 def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController 272 def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents 273 def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management 274 275 def(Compile_lock , Mutex , nonleaf+3, true ); 276 def(MethodData_lock , Mutex , nonleaf+3, false); 277 278 def(MethodCompileQueue_lock , Monitor, nonleaf+4, true ); 279 def(Debug2_lock , Mutex , nonleaf+4, true ); 280 def(Debug3_lock , Mutex , nonleaf+4, true ); 281 def(ProfileVM_lock , Monitor, special, false); // used for profiling of the VMThread 282 def(CompileThread_lock , Monitor, nonleaf+5, false ); 283 def(PeriodicTask_lock , Monitor, nonleaf+5, true); 284 285 #ifdef INCLUDE_TRACE 286 def(JfrMsg_lock , Monitor, leaf, true); 287 def(JfrBuffer_lock , Mutex, nonleaf+1, true); 288 def(JfrThreadGroups_lock , Mutex, nonleaf+1, true); 289 def(JfrStream_lock , Mutex, nonleaf+2, true); 290 def(JfrStacktrace_lock , Mutex, special, true ); 291 #endif 292 293 #ifndef SUPPORTS_NATIVE_CX8 294 def(UnsafeJlong_lock , Mutex, special, false); 295 #endif 296 } 297 298 GCMutexLocker::GCMutexLocker(Monitor * mutex) { 299 if (SafepointSynchronize::is_at_safepoint()) { 300 _locked = false; 301 } else { 302 _mutex = mutex; 303 _locked = true; 304 _mutex->lock(); 305 } 306 } 307 308 // Print all mutexes/monitors that are currently owned by a thread; called 309 // by fatal error handler. 310 void print_owned_locks_on_error(outputStream* st) { 311 st->print("VM Mutex/Monitor currently owned by a thread: "); 312 bool none = true; 313 for (int i = 0; i < _num_mutex; i++) { 314 // see if it has an owner 315 if (_mutex_array[i]->owner() != NULL) { 316 if (none) { 317 // print format used by Mutex::print_on_error() 318 st->print_cr(" ([mutex/lock_event])"); 319 none = false; 320 } 321 _mutex_array[i]->print_on_error(st); 322 st->cr(); 323 } 324 } 325 if (none) st->print_cr("None"); 326 }