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 Mutex* CMRegionStack_lock = NULL;
84 Mutex* SATB_Q_FL_lock = NULL;
85 Monitor* SATB_Q_CBL_mon = NULL;
86 Mutex* Shared_SATB_Q_lock = NULL;
87 Mutex* DirtyCardQ_FL_lock = NULL;
88 Monitor* DirtyCardQ_CBL_mon = NULL;
89 Mutex* Shared_DirtyCardQ_lock = NULL;
90 Mutex* ParGCRareEvent_lock = NULL;
91 Mutex* EvacFailureStack_lock = NULL;
92 Mutex* DerivedPointerTableGC_lock = NULL;
93 Mutex* Compile_lock = NULL;
94 Monitor* MethodCompileQueue_lock = NULL;
95 Monitor* CompileThread_lock = NULL;
96 Mutex* CompileTaskAlloc_lock = NULL;
97 Mutex* CompileStatistics_lock = NULL;
98 Mutex* MultiArray_lock = NULL;
99 Monitor* Terminator_lock = NULL;
100 Monitor* BeforeExit_lock = NULL;
101 Monitor* Notify_lock = NULL;
102 Monitor* Interrupt_lock = NULL;
103 Monitor* ProfileVM_lock = NULL;
104 Mutex* ProfilePrint_lock = NULL;
105 Mutex* ExceptionCache_lock = NULL;
106 Monitor* ObjAllocPost_lock = NULL;
107 Mutex* OsrList_lock = NULL;
108 #ifndef PRODUCT
109 Mutex* FullGCALot_lock = NULL;
110 #endif
111
112 Mutex* Debug1_lock = NULL;
113 Mutex* Debug2_lock = NULL;
114 Mutex* Debug3_lock = NULL;
115
116 Mutex* tty_lock = NULL;
117
118 Mutex* RawMonitor_lock = NULL;
119 Mutex* PerfDataMemAlloc_lock = NULL;
120 Mutex* PerfDataManager_lock = NULL;
121 Mutex* OopMapCacheAlloc_lock = NULL;
122
123 Mutex* FreeList_lock = NULL;
124 Monitor* SecondaryFreeList_lock = NULL;
125 Mutex* OldSets_lock = NULL;
126 Mutex* MMUTracker_lock = NULL;
127 Mutex* HotCardCache_lock = NULL;
128
129 Monitor* GCTaskManager_lock = NULL;
130
131 Mutex* Management_lock = NULL;
132 Monitor* Service_lock = NULL;
133
134 #define MAX_NUM_MUTEX 128
135 static Monitor * _mutex_array[MAX_NUM_MUTEX];
136 static int _num_mutex;
137
138 #ifdef ASSERT
139 void assert_locked_or_safepoint(const Monitor * lock) {
140 // check if this thread owns the lock (common case)
141 if (IgnoreLockingAssertions) return;
142 assert(lock != NULL, "Need non-NULL lock");
143 if (lock->owned_by_self()) return;
144 if (SafepointSynchronize::is_at_safepoint()) return;
145 if (!Universe::is_fully_initialized()) return;
146 // see if invoker of VM operation owns it
147 VM_Operation* op = VMThread::vm_operation();
148 if (op != NULL && op->calling_thread() == lock->owner()) return;
149 fatal(err_msg("must own lock %s", lock->name()));
150 }
151
152 // a stronger assertion than the above
153 void assert_lock_strong(const Monitor * lock) {
154 if (IgnoreLockingAssertions) return;
155 assert(lock != NULL, "Need non-NULL lock");
156 if (lock->owned_by_self()) return;
157 fatal(err_msg("must own lock %s", lock->name()));
158 }
159 #endif
160
161 #define def(var, type, pri, vm_block) { \
162 var = new type(Mutex::pri, #var, vm_block); \
163 assert(_num_mutex < MAX_NUM_MUTEX, \
164 "increase MAX_NUM_MUTEX"); \
165 _mutex_array[_num_mutex++] = var; \
166 }
167
168 void mutex_init() {
169 def(tty_lock , Mutex , event, true ); // allow to lock in VM
170
171 def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC
172 def(STS_init_lock , Mutex, leaf, true );
173 if (UseConcMarkSweepGC) {
174 def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification
175 }
176 if (UseConcMarkSweepGC || UseG1GC) {
177 def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent
178 }
179 if (UseG1GC) {
180 def(CMark_lock , Monitor, nonleaf, true ); // coordinate concurrent mark thread
181 def(CMRegionStack_lock , Mutex, leaf, true );
182 def(SATB_Q_FL_lock , Mutex , special, true );
183 def(SATB_Q_CBL_mon , Monitor, nonleaf, true );
184 def(Shared_SATB_Q_lock , Mutex, nonleaf, true );
185
186 def(DirtyCardQ_FL_lock , Mutex , special, true );
187 def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true );
188 def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true );
189
190 def(FreeList_lock , Mutex, leaf , true );
191 def(SecondaryFreeList_lock , Monitor, leaf , true );
192 def(OldSets_lock , Mutex , leaf , true );
193 def(MMUTracker_lock , Mutex , leaf , true );
194 def(HotCardCache_lock , Mutex , special , true );
195 def(EvacFailureStack_lock , Mutex , nonleaf , true );
196 }
197 def(ParGCRareEvent_lock , Mutex , leaf , true );
198 def(DerivedPointerTableGC_lock , Mutex, leaf, true );
199 def(CodeCache_lock , Mutex , special, true );
200 def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing
201 def(RawMonitor_lock , Mutex, special, true );
202 def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation.
203
204 def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching.
205 def(ObjAllocPost_lock , Monitor, special, false);
206 def(Service_lock , Monitor, special, true ); // used for service thread operations
207 def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs.
208
209 def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread
210 def(PackageTable_lock , Mutex , leaf, false);
211 def(InlineCacheBuffer_lock , Mutex , leaf, true );
212 def(VMStatistic_lock , Mutex , leaf, false);
213 def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread
214 def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread
215 def(SignatureHandlerLibrary_lock , Mutex , leaf, false);
216 def(SymbolTable_lock , Mutex , leaf, true );
217 def(StringTable_lock , Mutex , leaf, true );
218 def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing
219 def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing
220 def(OsrList_lock , Mutex , leaf, true );
221 def(Debug1_lock , Mutex , leaf, true );
222 #ifndef PRODUCT
223 def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe
224 #endif
225 def(BeforeExit_lock , Monitor, leaf, true );
226 def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data
227 def(PerfDataManager_lock , Mutex , leaf, true ); // used for synchronized access to PerfDataManager resources
228
229 // CMS_modUnionTable_lock leaf
230 // CMS_bitMap_lock leaf + 1
231 // CMS_freeList_lock leaf + 2
232
233 def(Safepoint_lock , Monitor, safepoint, true ); // locks SnippetCache_lock/Threads_lock
234
235 def(Threads_lock , Monitor, barrier, true );
236
237 def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these
238 def(VMOperationRequest_lock , Monitor, nonleaf, true );
239 def(RetData_lock , Mutex , nonleaf, false);
240 def(Terminator_lock , Monitor, nonleaf, true );
241 def(VtableStubs_lock , Mutex , nonleaf, true );
242 def(Notify_lock , Monitor, nonleaf, true );
243 def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock
244 def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions
245 def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true);
246 if (UseConcMarkSweepGC) {
247 def(SLT_lock , Monitor, nonleaf, false );
248 // used in CMS GC for locking PLL lock
249 }
250 def(Heap_lock , Monitor, nonleaf+1, false);
251 def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation
252 def(JNICachedItableIndex_lock , Mutex , nonleaf+1, false); // Used to cache an itable index during JNI invoke
253
254 def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock
255 def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true );
256 def(CompileStatistics_lock , Mutex , nonleaf+2, false);
257 def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock
258
259 def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController
260 def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents
261 def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management
262
263 def(Compile_lock , Mutex , nonleaf+3, true );
264 def(MethodData_lock , Mutex , nonleaf+3, false);
265
266 def(MethodCompileQueue_lock , Monitor, nonleaf+4, true );
267 def(Debug2_lock , Mutex , nonleaf+4, true );
268 def(Debug3_lock , Mutex , nonleaf+4, true );
269 def(ProfileVM_lock , Monitor, nonleaf+4, false); // used for profiling of the VMThread
270 def(CompileThread_lock , Monitor, nonleaf+5, false );
271 }
272
273 GCMutexLocker::GCMutexLocker(Monitor * mutex) {
274 if (SafepointSynchronize::is_at_safepoint()) {
275 _locked = false;
276 } else {
277 _mutex = mutex;
278 _locked = true;
279 _mutex->lock();
280 }
281 }
282
283 // Print all mutexes/monitors that are currently owned by a thread; called
284 // by fatal error handler.
285 void print_owned_locks_on_error(outputStream* st) {
286 st->print("VM Mutex/Monitor currently owned by a thread: ");
287 bool none = true;
288 for (int i = 0; i < _num_mutex; i++) {
289 // see if it has an owner
290 if (_mutex_array[i]->owner() != NULL) {
291 if (none) {
292 // print format used by Mutex::print_on_error()
293 st->print_cr(" ([mutex/lock_event])");
294 none = false;
295 }
296 _mutex_array[i]->print_on_error(st);
297 st->cr();
298 }
299 }
300 if (none) st->print_cr("None");
301 }