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src/share/vm/runtime/mutexLocker.cpp@595c0f60d50d
src/share/vm/runtime/mutexLocker.cpp
Tue, 18 Mar 2014 19:07:22 +0100
- author
- pliden
- date
- Tue, 18 Mar 2014 19:07:22 +0100
- changeset 6413
- 595c0f60d50d
- parent 5732
- b2e698d2276c
- child 6876
- 710a3c8b516e
- child 6906
- 581e70386ec9
- permissions
- -rw-r--r--
8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp
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 */
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"
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.
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 Mutex* STS_init_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
106 Mutex* Debug1_lock = NULL;
107 Mutex* Debug2_lock = NULL;
108 Mutex* Debug3_lock = NULL;
110 Mutex* tty_lock = NULL;
112 Mutex* RawMonitor_lock = NULL;
113 Mutex* PerfDataMemAlloc_lock = NULL;
114 Mutex* PerfDataManager_lock = NULL;
115 Mutex* OopMapCacheAlloc_lock = NULL;
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;
124 Monitor* GCTaskManager_lock = NULL;
126 Mutex* Management_lock = NULL;
127 Monitor* Service_lock = NULL;
128 Monitor* PeriodicTask_lock = NULL;
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
138 #define MAX_NUM_MUTEX 128
139 static Monitor * _mutex_array[MAX_NUM_MUTEX];
140 static int _num_mutex;
142 #ifdef ASSERT
143 void assert_locked_or_safepoint(const Monitor * lock) {
144 // check if this thread owns the lock (common case)
145 if (IgnoreLockingAssertions) return;
146 assert(lock != NULL, "Need non-NULL lock");
147 if (lock->owned_by_self()) return;
148 if (SafepointSynchronize::is_at_safepoint()) return;
149 if (!Universe::is_fully_initialized()) return;
150 // see if invoker of VM operation owns it
151 VM_Operation* op = VMThread::vm_operation();
152 if (op != NULL && op->calling_thread() == lock->owner()) return;
153 fatal(err_msg("must own lock %s", lock->name()));
154 }
156 // a stronger assertion than the above
157 void assert_lock_strong(const Monitor * lock) {
158 if (IgnoreLockingAssertions) return;
159 assert(lock != NULL, "Need non-NULL lock");
160 if (lock->owned_by_self()) return;
161 fatal(err_msg("must own lock %s", lock->name()));
162 }
163 #endif
165 #define def(var, type, pri, vm_block) { \
166 var = new type(Mutex::pri, #var, vm_block); \
167 assert(_num_mutex < MAX_NUM_MUTEX, \
168 "increase MAX_NUM_MUTEX"); \
169 _mutex_array[_num_mutex++] = var; \
170 }
172 void mutex_init() {
173 def(tty_lock , Mutex , event, true ); // allow to lock in VM
175 def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC
176 def(STS_init_lock , Mutex, leaf, true );
177 if (UseConcMarkSweepGC) {
178 def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification
179 }
180 if (UseConcMarkSweepGC || UseG1GC) {
181 def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent
182 }
183 if (UseG1GC) {
184 def(CMark_lock , Monitor, nonleaf, true ); // coordinate concurrent mark thread
185 def(CMRegionStack_lock , Mutex, leaf, true );
186 def(SATB_Q_FL_lock , Mutex , special, true );
187 def(SATB_Q_CBL_mon , Monitor, nonleaf, true );
188 def(Shared_SATB_Q_lock , Mutex, nonleaf, true );
190 def(DirtyCardQ_FL_lock , Mutex , special, true );
191 def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true );
192 def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true );
194 def(FreeList_lock , Mutex, leaf , true );
195 def(SecondaryFreeList_lock , Monitor, leaf , true );
196 def(OldSets_lock , Mutex , leaf , true );
197 def(RootRegionScan_lock , Monitor, leaf , true );
198 def(MMUTracker_lock , Mutex , leaf , true );
199 def(HotCardCache_lock , Mutex , special , true );
200 def(EvacFailureStack_lock , Mutex , nonleaf , true );
202 def(StringDedupQueue_lock , Monitor, leaf, true );
203 def(StringDedupTable_lock , Mutex , leaf, true );
204 }
205 def(ParGCRareEvent_lock , Mutex , leaf , true );
206 def(DerivedPointerTableGC_lock , Mutex, leaf, true );
207 def(CodeCache_lock , Mutex , special, true );
208 def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing
209 def(RawMonitor_lock , Mutex, special, true );
210 def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation.
212 def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching.
213 def(ObjAllocPost_lock , Monitor, special, false);
214 def(Service_lock , Monitor, special, true ); // used for service thread operations
215 def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs.
217 def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread
218 def(PackageTable_lock , Mutex , leaf, false);
219 def(InlineCacheBuffer_lock , Mutex , leaf, true );
220 def(VMStatistic_lock , Mutex , leaf, false);
221 def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread
222 def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread
223 def(SignatureHandlerLibrary_lock , Mutex , leaf, false);
224 def(SymbolTable_lock , Mutex , leaf+2, true );
225 def(StringTable_lock , Mutex , leaf, true );
226 def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing
227 def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing
228 def(OsrList_lock , Mutex , leaf, true );
229 def(Debug1_lock , Mutex , leaf, true );
230 #ifndef PRODUCT
231 def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe
232 #endif
233 def(BeforeExit_lock , Monitor, leaf, true );
234 def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data
235 def(PerfDataManager_lock , Mutex , leaf, true ); // used for synchronized access to PerfDataManager resources
237 // CMS_modUnionTable_lock leaf
238 // CMS_bitMap_lock leaf + 1
239 // CMS_freeList_lock leaf + 2
241 def(Safepoint_lock , Monitor, safepoint, true ); // locks SnippetCache_lock/Threads_lock
243 def(Threads_lock , Monitor, barrier, true );
245 def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these
246 def(VMOperationRequest_lock , Monitor, nonleaf, true );
247 def(RetData_lock , Mutex , nonleaf, false);
248 def(Terminator_lock , Monitor, nonleaf, true );
249 def(VtableStubs_lock , Mutex , nonleaf, true );
250 def(Notify_lock , Monitor, nonleaf, true );
251 def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock
252 def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions
253 def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true);
254 if (UseConcMarkSweepGC) {
255 def(SLT_lock , Monitor, nonleaf, false );
256 // used in CMS GC for locking PLL lock
257 }
258 def(Heap_lock , Monitor, nonleaf+1, false);
259 def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation
260 def(MemberNameTable_lock , Mutex , nonleaf+1, false); // Used to protect MemberNameTable
262 def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock
263 def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true );
264 def(CompileStatistics_lock , Mutex , nonleaf+2, false);
265 def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock
267 def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController
268 def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents
269 def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management
271 def(Compile_lock , Mutex , nonleaf+3, true );
272 def(MethodData_lock , Mutex , nonleaf+3, false);
274 def(MethodCompileQueue_lock , Monitor, nonleaf+4, true );
275 def(Debug2_lock , Mutex , nonleaf+4, true );
276 def(Debug3_lock , Mutex , nonleaf+4, true );
277 def(ProfileVM_lock , Monitor, special, false); // used for profiling of the VMThread
278 def(CompileThread_lock , Monitor, nonleaf+5, false );
279 def(PeriodicTask_lock , Monitor, nonleaf+5, true);
281 #ifdef INCLUDE_TRACE
282 def(JfrMsg_lock , Monitor, leaf, true);
283 def(JfrBuffer_lock , Mutex, nonleaf+1, true);
284 def(JfrThreadGroups_lock , Mutex, nonleaf+1, true);
285 def(JfrStream_lock , Mutex, nonleaf+2, true);
286 def(JfrStacktrace_lock , Mutex, special, true );
287 #endif
289 }
291 GCMutexLocker::GCMutexLocker(Monitor * mutex) {
292 if (SafepointSynchronize::is_at_safepoint()) {
293 _locked = false;
294 } else {
295 _mutex = mutex;
296 _locked = true;
297 _mutex->lock();
298 }
299 }
301 // Print all mutexes/monitors that are currently owned by a thread; called
302 // by fatal error handler.
303 void print_owned_locks_on_error(outputStream* st) {
304 st->print("VM Mutex/Monitor currently owned by a thread: ");
305 bool none = true;
306 for (int i = 0; i < _num_mutex; i++) {
307 // see if it has an owner
308 if (_mutex_array[i]->owner() != NULL) {
309 if (none) {
310 // print format used by Mutex::print_on_error()
311 st->print_cr(" ([mutex/lock_event])");
312 none = false;
313 }
314 _mutex_array[i]->print_on_error(st);
315 st->cr();
316 }
317 }
318 if (none) st->print_cr("None");
319 }
