1 /* 2 * Copyright (c) 1997, 2011, 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/threadLocalStorage.hpp" 29 #include "runtime/vmThread.hpp" 30 #ifdef TARGET_OS_FAMILY_linux 31 # include "thread_linux.inline.hpp" 32 #endif 33 #ifdef TARGET_OS_FAMILY_solaris 34 # include "thread_solaris.inline.hpp" 35 #endif 36 #ifdef TARGET_OS_FAMILY_windows 37 # include "thread_windows.inline.hpp" 38 #endif 39 40 // Mutexes used in the VM (see comment in mutexLocker.hpp): 41 // 42 // Note that the following pointers are effectively final -- after having been 43 // set at JVM startup-time, they should never be subsequently mutated. 44 // Instead of using pointers to malloc()ed monitors and mutexes we should consider 45 // eliminating the indirection and using instances instead. 46 // Consider using GCC's __read_mostly. 47 48 Mutex* Patching_lock = NULL; 49 Monitor* SystemDictionary_lock = NULL; 50 Mutex* PackageTable_lock = NULL; 51 Mutex* CompiledIC_lock = NULL; 52 Mutex* InlineCacheBuffer_lock = NULL; 53 Mutex* VMStatistic_lock = NULL; 54 Mutex* JNIGlobalHandle_lock = NULL; 55 Mutex* JNIHandleBlockFreeList_lock = NULL; 56 Mutex* JNICachedItableIndex_lock = NULL; 57 Mutex* JmethodIdCreation_lock = NULL; 58 Mutex* JfieldIdCreation_lock = NULL; 59 Monitor* JNICritical_lock = NULL; 60 Mutex* JvmtiThreadState_lock = NULL; 61 Monitor* JvmtiPendingEvent_lock = NULL; 62 Monitor* Heap_lock = NULL; 63 Mutex* ExpandHeap_lock = NULL; 64 Mutex* AdapterHandlerLibrary_lock = NULL; 65 Mutex* SignatureHandlerLibrary_lock = NULL; 66 Mutex* VtableStubs_lock = NULL; 67 Mutex* SymbolTable_lock = NULL; 68 Mutex* StringTable_lock = NULL; 69 Mutex* CodeCache_lock = NULL; 70 Mutex* MethodData_lock = NULL; 71 Mutex* RetData_lock = NULL; 72 Monitor* VMOperationQueue_lock = NULL; 73 Monitor* VMOperationRequest_lock = NULL; 74 Monitor* Safepoint_lock = NULL; 75 Monitor* SerializePage_lock = NULL; 76 Monitor* Threads_lock = NULL; 77 Monitor* CGC_lock = NULL; 78 Mutex* STS_init_lock = NULL; 79 Monitor* SLT_lock = NULL; 80 Monitor* iCMS_lock = NULL; 81 Monitor* FullGCCount_lock = NULL; 82 Monitor* CMark_lock = NULL; 83 Monitor* ZF_mon = NULL; 84 Monitor* Cleanup_mon = NULL; 85 Mutex* CMRegionStack_lock = NULL; 86 Mutex* SATB_Q_FL_lock = NULL; 87 Monitor* SATB_Q_CBL_mon = NULL; 88 Mutex* Shared_SATB_Q_lock = NULL; 89 Mutex* DirtyCardQ_FL_lock = NULL; 90 Monitor* DirtyCardQ_CBL_mon = NULL; 91 Mutex* Shared_DirtyCardQ_lock = NULL; 92 Mutex* ParGCRareEvent_lock = NULL; 93 Mutex* EvacFailureStack_lock = NULL; 94 Mutex* DerivedPointerTableGC_lock = NULL; 95 Mutex* Compile_lock = NULL; 96 Monitor* MethodCompileQueue_lock = NULL; 97 Monitor* CompileThread_lock = NULL; 98 Mutex* CompileTaskAlloc_lock = NULL; 99 Mutex* CompileStatistics_lock = NULL; 100 Mutex* MultiArray_lock = NULL; 101 Monitor* Terminator_lock = NULL; 102 Monitor* BeforeExit_lock = NULL; 103 Monitor* Notify_lock = NULL; 104 Monitor* Interrupt_lock = NULL; 105 Monitor* ProfileVM_lock = NULL; 106 Mutex* ProfilePrint_lock = NULL; 107 Mutex* ExceptionCache_lock = NULL; 108 Monitor* ObjAllocPost_lock = NULL; 109 Mutex* OsrList_lock = NULL; 110 #ifndef PRODUCT 111 Mutex* FullGCALot_lock = NULL; 112 #endif 113 114 Mutex* Debug1_lock = NULL; 115 Mutex* Debug2_lock = NULL; 116 Mutex* Debug3_lock = NULL; 117 118 Mutex* tty_lock = NULL; 119 120 Mutex* RawMonitor_lock = NULL; 121 Mutex* PerfDataMemAlloc_lock = NULL; 122 Mutex* PerfDataManager_lock = NULL; 123 Mutex* OopMapCacheAlloc_lock = NULL; 124 125 Mutex* MMUTracker_lock = NULL; 126 Mutex* HotCardCache_lock = NULL; 127 128 Monitor* GCTaskManager_lock = NULL; 129 130 Mutex* Management_lock = NULL; 131 Monitor* Service_lock = NULL; 132 133 #define MAX_NUM_MUTEX 128 134 static Monitor * _mutex_array[MAX_NUM_MUTEX]; 135 static int _num_mutex; 136 137 #ifdef ASSERT 138 void assert_locked_or_safepoint(const Monitor * lock) { 139 // check if this thread owns the lock (common case) 140 if (IgnoreLockingAssertions) return; 141 assert(lock != NULL, "Need non-NULL lock"); 142 if (lock->owned_by_self()) return; 143 if (SafepointSynchronize::is_at_safepoint()) return; 144 if (!Universe::is_fully_initialized()) return; 145 // see if invoker of VM operation owns it 146 VM_Operation* op = VMThread::vm_operation(); 147 if (op != NULL && op->calling_thread() == lock->owner()) return; 148 fatal(err_msg("must own lock %s", lock->name())); 149 } 150 151 // a stronger assertion than the above 152 void assert_lock_strong(const Monitor * lock) { 153 if (IgnoreLockingAssertions) return; 154 assert(lock != NULL, "Need non-NULL lock"); 155 if (lock->owned_by_self()) return; 156 fatal(err_msg("must own lock %s", lock->name())); 157 } 158 #endif 159 160 #define def(var, type, pri, vm_block) { \ 161 var = new type(Mutex::pri, #var, vm_block); \ 162 assert(_num_mutex < MAX_NUM_MUTEX, \ 163 "increase MAX_NUM_MUTEX"); \ 164 _mutex_array[_num_mutex++] = var; \ 165 } 166 167 void mutex_init() { 168 def(tty_lock , Mutex , event, true ); // allow to lock in VM 169 170 def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC 171 def(STS_init_lock , Mutex, leaf, true ); 172 if (UseConcMarkSweepGC) { 173 def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification 174 } 175 if (UseConcMarkSweepGC || UseG1GC) { 176 def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent 177 } 178 if (UseG1GC) { 179 def(CMark_lock , Monitor, nonleaf, true ); // coordinate concurrent mark thread 180 def(ZF_mon , Monitor, leaf, true ); 181 def(Cleanup_mon , Monitor, nonleaf, true ); 182 def(CMRegionStack_lock , Mutex, leaf, true ); 183 def(SATB_Q_FL_lock , Mutex , special, true ); 184 def(SATB_Q_CBL_mon , Monitor, nonleaf, true ); 185 def(Shared_SATB_Q_lock , Mutex, nonleaf, true ); 186 187 def(DirtyCardQ_FL_lock , Mutex , special, true ); 188 def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true ); 189 def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true ); 190 191 def(MMUTracker_lock , Mutex , leaf , true ); 192 def(HotCardCache_lock , Mutex , special , true ); 193 def(EvacFailureStack_lock , Mutex , nonleaf , true ); 194 } 195 def(ParGCRareEvent_lock , Mutex , leaf , true ); 196 def(DerivedPointerTableGC_lock , Mutex, leaf, true ); 197 def(CodeCache_lock , Mutex , special, true ); 198 def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing 199 def(RawMonitor_lock , Mutex, special, true ); 200 def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation. 201 202 def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching. 203 def(ObjAllocPost_lock , Monitor, special, false); 204 def(Service_lock , Monitor, special, true ); // used for service thread operations 205 def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs. 206 207 def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread 208 def(PackageTable_lock , Mutex , leaf, false); 209 def(InlineCacheBuffer_lock , Mutex , leaf, true ); 210 def(VMStatistic_lock , Mutex , leaf, false); 211 def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread 212 def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread 213 def(SignatureHandlerLibrary_lock , Mutex , leaf, false); 214 def(SymbolTable_lock , Mutex , leaf, true ); 215 def(StringTable_lock , Mutex , leaf, true ); 216 def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing 217 def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing 218 def(OsrList_lock , Mutex , leaf, true ); 219 def(Debug1_lock , Mutex , leaf, true ); 220 #ifndef PRODUCT 221 def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe 222 #endif 223 def(BeforeExit_lock , Monitor, leaf, true ); 224 def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data 225 def(PerfDataManager_lock , Mutex , leaf, true ); // used for synchronized access to PerfDataManager resources 226 227 // CMS_modUnionTable_lock leaf 228 // CMS_bitMap_lock leaf + 1 229 // CMS_freeList_lock leaf + 2 230 231 def(Safepoint_lock , Monitor, safepoint, true ); // locks SnippetCache_lock/Threads_lock 232 233 def(Threads_lock , Monitor, barrier, true ); 234 235 def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these 236 def(VMOperationRequest_lock , Monitor, nonleaf, true ); 237 def(RetData_lock , Mutex , nonleaf, false); 238 def(Terminator_lock , Monitor, nonleaf, true ); 239 def(VtableStubs_lock , Mutex , nonleaf, true ); 240 def(Notify_lock , Monitor, nonleaf, true ); 241 def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock 242 def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions 243 def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true); 244 if (UseConcMarkSweepGC) { 245 def(SLT_lock , Monitor, nonleaf, false ); 246 // used in CMS GC for locking PLL lock 247 } 248 def(Heap_lock , Monitor, nonleaf+1, false); 249 def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation 250 def(JNICachedItableIndex_lock , Mutex , nonleaf+1, false); // Used to cache an itable index during JNI invoke 251 252 def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock 253 def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true ); 254 def(CompileStatistics_lock , Mutex , nonleaf+2, false); 255 def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock 256 257 def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController 258 def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents 259 def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management 260 261 def(Compile_lock , Mutex , nonleaf+3, true ); 262 def(MethodData_lock , Mutex , nonleaf+3, false); 263 264 def(MethodCompileQueue_lock , Monitor, nonleaf+4, true ); 265 def(Debug2_lock , Mutex , nonleaf+4, true ); 266 def(Debug3_lock , Mutex , nonleaf+4, true ); 267 def(ProfileVM_lock , Monitor, nonleaf+4, false); // used for profiling of the VMThread 268 def(CompileThread_lock , Monitor, nonleaf+5, false ); 269 } 270 271 GCMutexLocker::GCMutexLocker(Monitor * mutex) { 272 if (SafepointSynchronize::is_at_safepoint()) { 273 _locked = false; 274 } else { 275 _mutex = mutex; 276 _locked = true; 277 _mutex->lock(); 278 } 279 } 280 281 // Print all mutexes/monitors that are currently owned by a thread; called 282 // by fatal error handler. 283 void print_owned_locks_on_error(outputStream* st) { 284 st->print("VM Mutex/Monitor currently owned by a thread: "); 285 bool none = true; 286 for (int i = 0; i < _num_mutex; i++) { 287 // see if it has an owner 288 if (_mutex_array[i]->owner() != NULL) { 289 if (none) { 290 // print format used by Mutex::print_on_error() 291 st->print_cr(" ([mutex/lock_event])"); 292 none = false; 293 } 294 _mutex_array[i]->print_on_error(st); 295 st->cr(); 296 } 297 } 298 if (none) st->print_cr("None"); 299 }