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/safepoint.hpp"
28 #include "runtime/thread.inline.hpp"
29 #include "runtime/threadLocalStorage.hpp"
30 #include "runtime/vmThread.hpp"
31
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.
39
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 Monitor* STS_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
105
106 Mutex* Debug1_lock = NULL;
107 Mutex* Debug2_lock = NULL;
108 Mutex* Debug3_lock = NULL;
109
110 Mutex* tty_lock = NULL;
111
112 Mutex* RawMonitor_lock = NULL;
113 Mutex* PerfDataMemAlloc_lock = NULL;
114 Mutex* PerfDataManager_lock = NULL;
115 Mutex* OopMapCacheAlloc_lock = NULL;
116
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
123 Monitor* GCTaskManager_lock = NULL;
124
125 Mutex* Management_lock = NULL;
126 Monitor* Service_lock = NULL;
127 Monitor* PeriodicTask_lock = NULL;
128 Monitor* RedefineClasses_lock = NULL;
129
130 #ifdef INCLUDE_JFR
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
137 #ifndef SUPPORTS_NATIVE_CX8
138 Mutex* JfrCounters_lock = NULL;
139 #endif
140 #endif
141
142 #ifndef SUPPORTS_NATIVE_CX8
143 Mutex* UnsafeJlong_lock = NULL;
144 #endif
145
146 #define MAX_NUM_MUTEX 128
147 static Monitor * _mutex_array[MAX_NUM_MUTEX];
148 static int _num_mutex;
149
150 #ifdef ASSERT
assert_locked_or_safepoint(const Monitor * lock)151 void assert_locked_or_safepoint(const Monitor * lock) {
152 // check if this thread owns the lock (common case)
153 if (IgnoreLockingAssertions) return;
154 assert(lock != NULL, "Need non-NULL lock");
155 if (lock->owned_by_self()) return;
156 if (SafepointSynchronize::is_at_safepoint()) return;
157 if (!Universe::is_fully_initialized()) return;
158 // see if invoker of VM operation owns it
159 VM_Operation* op = VMThread::vm_operation();
160 if (op != NULL && op->calling_thread() == lock->owner()) return;
161 fatal(err_msg("must own lock %s", lock->name()));
162 }
163
164 // a stronger assertion than the above
assert_lock_strong(const Monitor * lock)165 void assert_lock_strong(const Monitor * lock) {
166 if (IgnoreLockingAssertions) return;
167 assert(lock != NULL, "Need non-NULL lock");
168 if (lock->owned_by_self()) return;
169 fatal(err_msg("must own lock %s", lock->name()));
170 }
171 #endif
172
173 #define def(var, type, pri, vm_block) { \
174 var = new type(Mutex::pri, #var, vm_block); \
175 assert(_num_mutex < MAX_NUM_MUTEX, \
176 "increase MAX_NUM_MUTEX"); \
177 _mutex_array[_num_mutex++] = var; \
178 }
179
mutex_init()180 void mutex_init() {
181 def(tty_lock , Mutex , event, true ); // allow to lock in VM
182
183 def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC
184 def(STS_lock , Monitor, leaf, true );
185 if (UseConcMarkSweepGC) {
186 def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification
187 }
188 if (UseConcMarkSweepGC || UseG1GC) {
189 def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent
190 }
191 if (UseG1GC) {
192 def(CMark_lock , Monitor, nonleaf, true ); // coordinate concurrent mark thread
193 def(CMRegionStack_lock , Mutex, leaf, true );
194 def(SATB_Q_FL_lock , Mutex , special, true );
195 def(SATB_Q_CBL_mon , Monitor, nonleaf, true );
196 def(Shared_SATB_Q_lock , Mutex, nonleaf, true );
197
198 def(DirtyCardQ_FL_lock , Mutex , special, true );
199 def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true );
200 def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true );
201
202 def(FreeList_lock , Mutex, leaf , true );
203 def(SecondaryFreeList_lock , Monitor, leaf , true );
204 def(OldSets_lock , Mutex , leaf , true );
205 def(RootRegionScan_lock , Monitor, leaf , true );
206 def(MMUTracker_lock , Mutex , leaf , true );
207 def(EvacFailureStack_lock , Mutex , nonleaf , true );
208
209 def(StringDedupQueue_lock , Monitor, leaf, true );
210 def(StringDedupTable_lock , Mutex , leaf, true );
211 }
212 def(ParGCRareEvent_lock , Mutex , leaf , true );
213 def(DerivedPointerTableGC_lock , Mutex, leaf, true );
214 def(CodeCache_lock , Mutex , special, true );
215 def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing
216 def(RawMonitor_lock , Mutex, special, true );
217 def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation.
218
219 def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching.
220 def(ObjAllocPost_lock , Monitor, special, false);
221 def(Service_lock , Monitor, special, true ); // used for service thread operations
222 def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs.
223
224 def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread
225 def(PackageTable_lock , Mutex , leaf, false);
226 def(InlineCacheBuffer_lock , Mutex , leaf, true );
227 def(VMStatistic_lock , Mutex , leaf, false);
228 def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread
229 def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread
230 def(SignatureHandlerLibrary_lock , Mutex , leaf, false);
231 def(SymbolTable_lock , Mutex , leaf+2, true );
232 def(StringTable_lock , Mutex , leaf, true );
233 def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing
234 def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing
235 def(OsrList_lock , Mutex , leaf, true );
236 def(Debug1_lock , Mutex , leaf, true );
237 #ifndef PRODUCT
238 def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe
239 #endif
240 def(BeforeExit_lock , Monitor, leaf, true );
241 def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data
242 def(PerfDataManager_lock , Mutex , leaf, true ); // used for synchronized access to PerfDataManager resources
243
244 // CMS_modUnionTable_lock leaf
245 // CMS_bitMap_lock leaf + 1
246 // CMS_freeList_lock leaf + 2
247
248 def(Safepoint_lock , Monitor, safepoint, true ); // locks SnippetCache_lock/Threads_lock
249
250 def(Threads_lock , Monitor, barrier, true );
251
252 def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these
253 def(VMOperationRequest_lock , Monitor, nonleaf, true );
254 def(RetData_lock , Mutex , nonleaf, false);
255 def(Terminator_lock , Monitor, nonleaf, true );
256 def(VtableStubs_lock , Mutex , nonleaf, true );
257 def(Notify_lock , Monitor, nonleaf, true );
258 def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock
259 def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions
260 def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true);
261 if (UseConcMarkSweepGC) {
262 def(SLT_lock , Monitor, nonleaf, false );
263 // used in CMS GC for locking PLL lock
264 }
265 def(Heap_lock , Monitor, nonleaf+1, false);
266 def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation
267 def(MemberNameTable_lock , Mutex , nonleaf+1, false); // Used to protect MemberNameTable
268
269 def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock
270 def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true );
271 def(CompileStatistics_lock , Mutex , nonleaf+2, false);
272 def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock
273
274 def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController
275 def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents
276 def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management
277
278 def(Compile_lock , Mutex , nonleaf+3, true );
279 def(MethodData_lock , Mutex , nonleaf+3, false);
280
281 def(MethodCompileQueue_lock , Monitor, nonleaf+4, true );
282 def(Debug2_lock , Mutex , nonleaf+4, true );
283 def(Debug3_lock , Mutex , nonleaf+4, true );
284 def(ProfileVM_lock , Monitor, special, false); // used for profiling of the VMThread
285 def(CompileThread_lock , Monitor, nonleaf+5, false );
286 def(PeriodicTask_lock , Monitor, nonleaf+5, true);
287 def(RedefineClasses_lock , Monitor, nonleaf+5, true);
288
289 #if INCLUDE_JFR
290 def(JfrMsg_lock , Monitor, leaf, true);
291 def(JfrBuffer_lock , Mutex, leaf, true);
292 def(JfrThreadGroups_lock , Mutex, leaf, true);
293 def(JfrStream_lock , Mutex, nonleaf, true);
294 def(JfrStacktrace_lock , Mutex, special, true);
295
296 #ifndef SUPPORTS_NATIVE_CX8
297 def(JfrCounters_lock , Mutex, special, false);
298 #endif
299 #endif
300
301 #ifndef SUPPORTS_NATIVE_CX8
302 def(UnsafeJlong_lock , Mutex, special, false);
303 #endif
304 }
305
GCMutexLocker(Monitor * mutex)306 GCMutexLocker::GCMutexLocker(Monitor * mutex) {
307 if (SafepointSynchronize::is_at_safepoint()) {
308 _locked = false;
309 } else {
310 _mutex = mutex;
311 _locked = true;
312 _mutex->lock();
313 }
314 }
315
316 // Print all mutexes/monitors that are currently owned by a thread; called
317 // by fatal error handler.
print_owned_locks_on_error(outputStream * st)318 void print_owned_locks_on_error(outputStream* st) {
319 st->print("VM Mutex/Monitor currently owned by a thread: ");
320 bool none = true;
321 for (int i = 0; i < _num_mutex; i++) {
322 // see if it has an owner
323 if (_mutex_array[i]->owner() != NULL) {
324 if (none) {
325 // print format used by Mutex::print_on_error()
326 st->print_cr(" ([mutex/lock_event])");
327 none = false;
328 }
329 _mutex_array[i]->print_on_error(st);
330 st->cr();
331 }
332 }
333 if (none) st->print_cr("None");
334 }
335