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 }