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