1 /*
2 * Copyright (c) 1997, 2015, 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* TouchedMethodLog_lock = NULL;
67 Mutex* RetData_lock = NULL;
68 Monitor* VMOperationQueue_lock = NULL;
69 Monitor* VMOperationRequest_lock = NULL;
70 Monitor* Safepoint_lock = NULL;
71 Monitor* SerializePage_lock = NULL;
72 Monitor* Threads_lock = NULL;
73 Monitor* CGC_lock = NULL;
74 Monitor* STS_lock = NULL;
75 Monitor* SLT_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* DerivedPointerTableGC_lock = NULL;
87 Mutex* Compile_lock = NULL;
88 Monitor* MethodCompileQueue_lock = NULL;
89 Monitor* CompileThread_lock = NULL;
90 Monitor* Compilation_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
104 #ifndef PRODUCT
105 Mutex* FullGCALot_lock = NULL;
106 #endif
107
108 Mutex* Debug1_lock = NULL;
109 Mutex* Debug2_lock = NULL;
110 Mutex* Debug3_lock = NULL;
111
112 Mutex* tty_lock = NULL;
113
114 Mutex* RawMonitor_lock = NULL;
115 Mutex* PerfDataMemAlloc_lock = NULL;
116 Mutex* PerfDataManager_lock = NULL;
117 Mutex* OopMapCacheAlloc_lock = NULL;
118
119 Mutex* FreeList_lock = NULL;
120 Monitor* SecondaryFreeList_lock = NULL;
121 Mutex* OldSets_lock = NULL;
122 Monitor* RootRegionScan_lock = NULL;
123 Mutex* MMUTracker_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 #ifndef SUPPORTS_NATIVE_CX8
140 Mutex* UnsafeJlong_lock = NULL;
141 #endif
142
143 #define MAX_NUM_MUTEX 128
144 static Monitor * _mutex_array[MAX_NUM_MUTEX];
145 static int _num_mutex;
146
147 #ifdef ASSERT
148 void assert_locked_or_safepoint(const Monitor * lock) {
149 // check if this thread owns the lock (common case)
150 if (IgnoreLockingAssertions) return;
151 assert(lock != NULL, "Need non-NULL lock");
152 if (lock->owned_by_self()) return;
153 if (SafepointSynchronize::is_at_safepoint()) return;
154 if (!Universe::is_fully_initialized()) return;
155 // see if invoker of VM operation owns it
156 VM_Operation* op = VMThread::vm_operation();
157 if (op != NULL && op->calling_thread() == lock->owner()) return;
158 fatal(err_msg("must own lock %s", lock->name()));
159 }
160
161 // a stronger assertion than the above
162 void assert_lock_strong(const Monitor * lock) {
163 if (IgnoreLockingAssertions) return;
164 assert(lock != NULL, "Need non-NULL lock");
165 if (lock->owned_by_self()) return;
166 fatal(err_msg("must own lock %s", lock->name()));
167 }
168 #endif
169
170 #define def(var, type, pri, vm_block, safepoint_check_allowed ) { \
171 var = new type(Mutex::pri, #var, vm_block, safepoint_check_allowed); \
172 assert(_num_mutex < MAX_NUM_MUTEX, "increase MAX_NUM_MUTEX"); \
173 _mutex_array[_num_mutex++] = var; \
174 }
175
176 void mutex_init() {
177 def(tty_lock , Mutex , event, true, Monitor::_safepoint_check_never); // allow to lock in VM
178
179 def(CGC_lock , Monitor, special, true, Monitor::_safepoint_check_never); // coordinate between fore- and background GC
180 def(STS_lock , Monitor, leaf, true, Monitor::_safepoint_check_never);
181
182 if (UseConcMarkSweepGC || UseG1GC) {
183 def(FullGCCount_lock , Monitor, leaf, true, Monitor::_safepoint_check_never); // in support of ExplicitGCInvokesConcurrent
184 }
185 if (UseG1GC) {
186
187 def(CMark_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_never); // coordinate concurrent mark thread
188 def(CMRegionStack_lock , Mutex, leaf, true, Monitor::_safepoint_check_never);
189 def(SATB_Q_FL_lock , Mutex , special, true, Monitor::_safepoint_check_never);
190 def(SATB_Q_CBL_mon , Monitor, nonleaf, true, Monitor::_safepoint_check_never);
191 def(Shared_SATB_Q_lock , Mutex, nonleaf, true, Monitor::_safepoint_check_never);
192
193 def(DirtyCardQ_FL_lock , Mutex , special, true, Monitor::_safepoint_check_never);
194 def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true, Monitor::_safepoint_check_never);
195 def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true, Monitor::_safepoint_check_never);
196
197 def(FreeList_lock , Mutex, leaf , true, Monitor::_safepoint_check_never);
198 def(SecondaryFreeList_lock , Monitor, leaf , true, Monitor::_safepoint_check_never);
199 def(OldSets_lock , Mutex , leaf , true, Monitor::_safepoint_check_never);
200 def(RootRegionScan_lock , Monitor, leaf , true, Monitor::_safepoint_check_never);
201 def(MMUTracker_lock , Mutex , leaf , true, Monitor::_safepoint_check_never);
202
203 def(StringDedupQueue_lock , Monitor, leaf, true, Monitor::_safepoint_check_never);
204 def(StringDedupTable_lock , Mutex , leaf, true, Monitor::_safepoint_check_never);
205 }
206 def(ParGCRareEvent_lock , Mutex , leaf , true, Monitor::_safepoint_check_sometimes);
207 def(DerivedPointerTableGC_lock , Mutex, leaf, true, Monitor::_safepoint_check_never);
208 def(CodeCache_lock , Mutex , special, true, Monitor::_safepoint_check_never);
209 def(Interrupt_lock , Monitor, special, true, Monitor::_safepoint_check_never); // used for interrupt processing
210 def(RawMonitor_lock , Mutex, special, true, Monitor::_safepoint_check_never);
211 def(OopMapCacheAlloc_lock , Mutex, leaf, true, Monitor::_safepoint_check_always); // used for oop_map_cache allocation.
212
213 def(Patching_lock , Mutex , special, true, Monitor::_safepoint_check_never); // used for safepointing and code patching.
214 def(ObjAllocPost_lock , Monitor, special, false, Monitor::_safepoint_check_never);
215 def(Service_lock , Monitor, special, true, Monitor::_safepoint_check_never); // used for service thread operations
216 def(JmethodIdCreation_lock , Mutex , leaf, true, Monitor::_safepoint_check_always); // used for creating jmethodIDs.
217
218 def(SystemDictionary_lock , Monitor, leaf, true, Monitor::_safepoint_check_always); // lookups done by VM thread
219 def(PackageTable_lock , Mutex , leaf, false, Monitor::_safepoint_check_always);
220 def(InlineCacheBuffer_lock , Mutex , leaf, true, Monitor::_safepoint_check_always);
221 def(VMStatistic_lock , Mutex , leaf, false, Monitor::_safepoint_check_always);
222 def(ExpandHeap_lock , Mutex , leaf, true, Monitor::_safepoint_check_always); // Used during compilation by VM thread
223 def(JNIHandleBlockFreeList_lock , Mutex , leaf, true, Monitor::_safepoint_check_never); // handles are used by VM thread
224 def(SignatureHandlerLibrary_lock , Mutex , leaf, false, Monitor::_safepoint_check_always);
225 def(SymbolTable_lock , Mutex , leaf+2, true, Monitor::_safepoint_check_always);
226 def(StringTable_lock , Mutex , leaf, true, Monitor::_safepoint_check_always);
227 def(ProfilePrint_lock , Mutex , leaf, false, Monitor::_safepoint_check_always); // serial profile printing
228 def(ExceptionCache_lock , Mutex , leaf, false, Monitor::_safepoint_check_always); // serial profile printing
229 def(OsrList_lock , Mutex , leaf, true, Monitor::_safepoint_check_never);
230 def(Debug1_lock , Mutex , leaf, true, Monitor::_safepoint_check_never);
231 #ifndef PRODUCT
232 def(FullGCALot_lock , Mutex , leaf, false, Monitor::_safepoint_check_always); // a lock to make FullGCALot MT safe
233 #endif
234 def(BeforeExit_lock , Monitor, leaf, true, Monitor::_safepoint_check_always);
235 def(PerfDataMemAlloc_lock , Mutex , leaf, true, Monitor::_safepoint_check_always); // used for allocating PerfData memory for performance data
236 def(PerfDataManager_lock , Mutex , leaf, true, Monitor::_safepoint_check_always); // 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, Monitor::_safepoint_check_sometimes); // locks SnippetCache_lock/Threads_lock
243
244 def(Threads_lock , Monitor, barrier, true, Monitor::_safepoint_check_sometimes);
245
246 def(VMOperationQueue_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_sometimes); // VM_thread allowed to block on these
247 def(VMOperationRequest_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_sometimes);
248 def(RetData_lock , Mutex , nonleaf, false, Monitor::_safepoint_check_always);
249 def(Terminator_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_sometimes);
250 def(VtableStubs_lock , Mutex , nonleaf, true, Monitor::_safepoint_check_always);
251 def(Notify_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_always);
252 def(JNIGlobalHandle_lock , Mutex , nonleaf, true, Monitor::_safepoint_check_always); // locks JNIHandleBlockFreeList_lock
253 def(JNICritical_lock , Monitor, nonleaf, true, Monitor::_safepoint_check_always); // used for JNI critical regions
254 def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true, Monitor::_safepoint_check_always);
255 if (UseConcMarkSweepGC) {
256 def(SLT_lock , Monitor, nonleaf, false, Monitor::_safepoint_check_never); // used in CMS GC for locking PLL lock
257 }
258
259 def(Heap_lock , Monitor, nonleaf+1, false, Monitor::_safepoint_check_sometimes);
260 def(JfieldIdCreation_lock , Mutex , nonleaf+1, true, Monitor::_safepoint_check_always); // jfieldID, Used in VM_Operation
261 def(MemberNameTable_lock , Mutex , nonleaf+1, false, Monitor::_safepoint_check_always); // Used to protect MemberNameTable
262
263 def(CompiledIC_lock , Mutex , nonleaf+2, false, Monitor::_safepoint_check_always); // locks VtableStubs_lock, InlineCacheBuffer_lock
264 def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true, Monitor::_safepoint_check_always);
265 def(CompileStatistics_lock , Mutex , nonleaf+2, false, Monitor::_safepoint_check_always);
266 def(MultiArray_lock , Mutex , nonleaf+2, false, Monitor::_safepoint_check_always); // locks SymbolTable_lock
267
268 def(JvmtiThreadState_lock , Mutex , nonleaf+2, false, Monitor::_safepoint_check_always); // Used by JvmtiThreadState/JvmtiEventController
269 def(JvmtiPendingEvent_lock , Monitor, nonleaf, false, Monitor::_safepoint_check_never); // Used by JvmtiCodeBlobEvents
270 def(Management_lock , Mutex , nonleaf+2, false, Monitor::_safepoint_check_always); // used for JVM management
271
272 def(Compile_lock , Mutex , nonleaf+3, true, Monitor::_safepoint_check_sometimes);
273 def(MethodData_lock , Mutex , nonleaf+3, false, Monitor::_safepoint_check_always);
274 def(TouchedMethodLog_lock , Mutex , nonleaf+3, false, Monitor::_safepoint_check_always);
275
276 def(MethodCompileQueue_lock , Monitor, nonleaf+4, true, Monitor::_safepoint_check_always);
277 def(Debug2_lock , Mutex , nonleaf+4, true, Monitor::_safepoint_check_never);
278 def(Debug3_lock , Mutex , nonleaf+4, true, Monitor::_safepoint_check_never);
279 def(ProfileVM_lock , Monitor, special, false, Monitor::_safepoint_check_never); // used for profiling of the VMThread
280 def(CompileThread_lock , Monitor, nonleaf+5, false, Monitor::_safepoint_check_always);
281 def(PeriodicTask_lock , Monitor, nonleaf+5, true, Monitor::_safepoint_check_sometimes);
282 if (WhiteBoxAPI) {
283 def(Compilation_lock , Monitor, leaf, false, Monitor::_safepoint_check_never);
284 }
285
286 #ifdef INCLUDE_TRACE
287 def(JfrMsg_lock , Monitor, leaf, true, Monitor::_safepoint_check_always);
288 def(JfrBuffer_lock , Mutex, leaf, true, Monitor::_safepoint_check_never);
289 def(JfrThreadGroups_lock , Mutex, leaf, true, Monitor::_safepoint_check_always);
290 def(JfrStream_lock , Mutex, nonleaf, true, Monitor::_safepoint_check_never);
291 def(JfrStacktrace_lock , Mutex, special, true, Monitor::_safepoint_check_sometimes);
292 #endif
293
294 #ifndef SUPPORTS_NATIVE_CX8
295 def(UnsafeJlong_lock , Mutex, special, false, Monitor::_safepoint_check_never);
296 #endif
297 }
298
299 GCMutexLocker::GCMutexLocker(Monitor * mutex) {
300 if (SafepointSynchronize::is_at_safepoint()) {
301 _locked = false;
302 } else {
303 _mutex = mutex;
304 _locked = true;
305 _mutex->lock();
306 }
307 }
308
309 // Print all mutexes/monitors that are currently owned by a thread; called
310 // by fatal error handler.
311 void print_owned_locks_on_error(outputStream* st) {
312 st->print("VM Mutex/Monitor currently owned by a thread: ");
313 bool none = true;
314 for (int i = 0; i < _num_mutex; i++) {
315 // see if it has an owner
316 if (_mutex_array[i]->owner() != NULL) {
317 if (none) {
318 // print format used by Mutex::print_on_error()
319 st->print_cr(" ([mutex/lock_event])");
320 none = false;
321 }
322 _mutex_array[i]->print_on_error(st);
323 st->cr();
324 }
325 }
326 if (none) st->print_cr("None");
327 }