Mercurial > hg > truffle
annotate src/share/vm/runtime/objectMonitor.hpp @ 12146:9758d9f36299
8021954: VM SIGSEGV during classloading on MacOS; hs_err_pid file produced
Summary: declare all user-defined operator new()s within Hotspot code with the empty throw() exception specification
Reviewed-by: coleenp, twisti, dholmes, hseigel, dcubed, kvn, ccheung
Contributed-by: lois.foltan@oracle.com
| author | coleenp |
|---|---|
| date | Thu, 29 Aug 2013 18:56:29 -0400 |
| parents | f2110083203d |
| children | 63a4eb8bcd23 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 10405 | 2 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_RUNTIME_OBJECTMONITOR_HPP |
| 26 #define SHARE_VM_RUNTIME_OBJECTMONITOR_HPP | |
| 27 | |
| 28 #include "runtime/os.hpp" | |
|
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29 #include "runtime/park.hpp" |
| 1972 | 30 #include "runtime/perfData.hpp" |
| 31 | |
| 1878 | 32 // ObjectWaiter serves as a "proxy" or surrogate thread. |
| 33 // TODO-FIXME: Eliminate ObjectWaiter and use the thread-specific | |
| 34 // ParkEvent instead. Beware, however, that the JVMTI code | |
| 35 // knows about ObjectWaiters, so we'll have to reconcile that code. | |
| 36 // See next_waiter(), first_waiter(), etc. | |
| 37 | |
| 38 class ObjectWaiter : public StackObj { | |
| 39 public: | |
| 40 enum TStates { TS_UNDEF, TS_READY, TS_RUN, TS_WAIT, TS_ENTER, TS_CXQ } ; | |
| 41 enum Sorted { PREPEND, APPEND, SORTED } ; | |
| 42 ObjectWaiter * volatile _next; | |
| 43 ObjectWaiter * volatile _prev; | |
| 44 Thread* _thread; | |
| 10405 | 45 jlong _notifier_tid; |
| 1878 | 46 ParkEvent * _event; |
| 47 volatile int _notified ; | |
| 48 volatile TStates TState ; | |
| 49 Sorted _Sorted ; // List placement disposition | |
| 50 bool _active ; // Contention monitoring is enabled | |
| 51 public: | |
| 52 ObjectWaiter(Thread* thread); | |
| 53 | |
| 54 void wait_reenter_begin(ObjectMonitor *mon); | |
| 55 void wait_reenter_end(ObjectMonitor *mon); | |
| 56 }; | |
| 57 | |
| 10405 | 58 // forward declaration to avoid include tracing.hpp |
| 59 class EventJavaMonitorWait; | |
| 60 | |
| 0 | 61 // WARNING: |
| 62 // This is a very sensitive and fragile class. DO NOT make any | |
| 63 // change unless you are fully aware of the underlying semantics. | |
| 64 | |
| 65 // This class can not inherit from any other class, because I have | |
| 66 // to let the displaced header be the very first word. Otherwise I | |
| 67 // have to let markOop include this file, which would export the | |
| 68 // monitor data structure to everywhere. | |
| 69 // | |
| 70 // The ObjectMonitor class is used to implement JavaMonitors which have | |
| 71 // transformed from the lightweight structure of the thread stack to a | |
| 72 // heavy weight lock due to contention | |
| 73 | |
| 74 // It is also used as RawMonitor by the JVMTI | |
| 75 | |
| 76 | |
| 77 class ObjectMonitor { | |
| 78 public: | |
| 79 enum { | |
| 80 OM_OK, // no error | |
| 81 OM_SYSTEM_ERROR, // operating system error | |
| 82 OM_ILLEGAL_MONITOR_STATE, // IllegalMonitorStateException | |
| 83 OM_INTERRUPTED, // Thread.interrupt() | |
| 84 OM_TIMED_OUT // Object.wait() timed out | |
| 85 }; | |
| 86 | |
| 87 public: | |
| 88 // TODO-FIXME: the "offset" routines should return a type of off_t instead of int ... | |
| 89 // ByteSize would also be an appropriate type. | |
| 90 static int header_offset_in_bytes() { return offset_of(ObjectMonitor, _header); } | |
| 91 static int object_offset_in_bytes() { return offset_of(ObjectMonitor, _object); } | |
| 92 static int owner_offset_in_bytes() { return offset_of(ObjectMonitor, _owner); } | |
| 93 static int count_offset_in_bytes() { return offset_of(ObjectMonitor, _count); } | |
| 94 static int recursions_offset_in_bytes() { return offset_of(ObjectMonitor, _recursions); } | |
| 95 static int cxq_offset_in_bytes() { return offset_of(ObjectMonitor, _cxq) ; } | |
| 96 static int succ_offset_in_bytes() { return offset_of(ObjectMonitor, _succ) ; } | |
| 97 static int EntryList_offset_in_bytes() { return offset_of(ObjectMonitor, _EntryList); } | |
| 98 static int FreeNext_offset_in_bytes() { return offset_of(ObjectMonitor, FreeNext); } | |
| 99 static int WaitSet_offset_in_bytes() { return offset_of(ObjectMonitor, _WaitSet) ; } | |
| 100 static int Responsible_offset_in_bytes() { return offset_of(ObjectMonitor, _Responsible);} | |
| 101 static int Spinner_offset_in_bytes() { return offset_of(ObjectMonitor, _Spinner); } | |
| 102 | |
| 103 public: | |
| 104 // Eventaully we'll make provisions for multiple callbacks, but | |
| 105 // now one will suffice. | |
| 106 static int (*SpinCallbackFunction)(intptr_t, int) ; | |
| 107 static intptr_t SpinCallbackArgument ; | |
| 108 | |
| 109 | |
| 110 public: | |
| 111 markOop header() const; | |
| 112 void set_header(markOop hdr); | |
| 113 | |
| 1878 | 114 intptr_t is_busy() const { |
| 115 // TODO-FIXME: merge _count and _waiters. | |
| 116 // TODO-FIXME: assert _owner == null implies _recursions = 0 | |
| 117 // TODO-FIXME: assert _WaitSet != null implies _count > 0 | |
| 118 return _count|_waiters|intptr_t(_owner)|intptr_t(_cxq)|intptr_t(_EntryList ) ; | |
| 119 } | |
| 120 | |
| 0 | 121 intptr_t is_entered(Thread* current) const; |
| 122 | |
| 123 void* owner() const; | |
| 124 void set_owner(void* owner); | |
| 125 | |
| 126 intptr_t waiters() const; | |
| 127 | |
| 128 intptr_t count() const; | |
| 129 void set_count(intptr_t count); | |
| 130 intptr_t contentions() const ; | |
| 1878 | 131 intptr_t recursions() const { return _recursions; } |
| 0 | 132 |
| 133 // JVM/DI GetMonitorInfo() needs this | |
| 1878 | 134 ObjectWaiter* first_waiter() { return _WaitSet; } |
| 135 ObjectWaiter* next_waiter(ObjectWaiter* o) { return o->_next; } | |
| 136 Thread* thread_of_waiter(ObjectWaiter* o) { return o->_thread; } | |
| 137 | |
| 138 // initialize the monitor, exception the semaphore, all other fields | |
| 139 // are simple integers or pointers | |
| 140 ObjectMonitor() { | |
| 141 _header = NULL; | |
| 142 _count = 0; | |
| 143 _waiters = 0, | |
| 144 _recursions = 0; | |
| 145 _object = NULL; | |
| 146 _owner = NULL; | |
| 147 _WaitSet = NULL; | |
| 148 _WaitSetLock = 0 ; | |
| 149 _Responsible = NULL ; | |
| 150 _succ = NULL ; | |
| 151 _cxq = NULL ; | |
| 152 FreeNext = NULL ; | |
| 153 _EntryList = NULL ; | |
| 154 _SpinFreq = 0 ; | |
| 155 _SpinClock = 0 ; | |
| 156 OwnerIsThread = 0 ; | |
| 10405 | 157 _previous_owner_tid = 0; |
| 1878 | 158 } |
| 0 | 159 |
| 1878 | 160 ~ObjectMonitor() { |
| 161 // TODO: Add asserts ... | |
| 162 // _cxq == 0 _succ == NULL _owner == NULL _waiters == 0 | |
| 163 // _count == 0 _EntryList == NULL etc | |
| 164 } | |
| 165 | |
| 166 private: | |
| 167 void Recycle () { | |
| 168 // TODO: add stronger asserts ... | |
| 169 // _cxq == 0 _succ == NULL _owner == NULL _waiters == 0 | |
| 170 // _count == 0 EntryList == NULL | |
| 171 // _recursions == 0 _WaitSet == NULL | |
| 172 // TODO: assert (is_busy()|_recursions) == 0 | |
| 173 _succ = NULL ; | |
| 174 _EntryList = NULL ; | |
| 175 _cxq = NULL ; | |
| 176 _WaitSet = NULL ; | |
| 177 _recursions = 0 ; | |
| 178 _SpinFreq = 0 ; | |
| 179 _SpinClock = 0 ; | |
| 180 OwnerIsThread = 0 ; | |
| 181 } | |
| 182 | |
| 183 public: | |
| 0 | 184 |
| 185 void* object() const; | |
| 186 void* object_addr(); | |
| 187 void set_object(void* obj); | |
| 188 | |
| 189 bool check(TRAPS); // true if the thread owns the monitor. | |
| 190 void check_slow(TRAPS); | |
| 191 void clear(); | |
| 192 #ifndef PRODUCT | |
| 193 void verify(); | |
| 194 void print(); | |
| 195 #endif | |
| 196 | |
| 197 bool try_enter (TRAPS) ; | |
| 198 void enter(TRAPS); | |
| 10405 | 199 void exit(bool not_suspended, TRAPS); |
| 0 | 200 void wait(jlong millis, bool interruptable, TRAPS); |
| 201 void notify(TRAPS); | |
| 202 void notifyAll(TRAPS); | |
| 203 | |
| 204 // Use the following at your own risk | |
| 205 intptr_t complete_exit(TRAPS); | |
| 206 void reenter(intptr_t recursions, TRAPS); | |
| 207 | |
| 208 private: | |
| 209 void AddWaiter (ObjectWaiter * waiter) ; | |
| 1878 | 210 static void DeferredInitialize(); |
| 0 | 211 |
| 212 ObjectWaiter * DequeueWaiter () ; | |
| 213 void DequeueSpecificWaiter (ObjectWaiter * waiter) ; | |
| 214 void EnterI (TRAPS) ; | |
| 215 void ReenterI (Thread * Self, ObjectWaiter * SelfNode) ; | |
| 216 void UnlinkAfterAcquire (Thread * Self, ObjectWaiter * SelfNode) ; | |
| 217 int TryLock (Thread * Self) ; | |
| 218 int NotRunnable (Thread * Self, Thread * Owner) ; | |
| 219 int TrySpin_Fixed (Thread * Self) ; | |
| 220 int TrySpin_VaryFrequency (Thread * Self) ; | |
| 221 int TrySpin_VaryDuration (Thread * Self) ; | |
| 222 void ctAsserts () ; | |
| 223 void ExitEpilog (Thread * Self, ObjectWaiter * Wakee) ; | |
| 224 bool ExitSuspendEquivalent (JavaThread * Self) ; | |
| 10405 | 225 void post_monitor_wait_event(EventJavaMonitorWait * event, |
| 226 jlong notifier_tid, | |
| 227 jlong timeout, | |
| 228 bool timedout); | |
| 0 | 229 |
| 230 private: | |
| 231 friend class ObjectSynchronizer; | |
| 232 friend class ObjectWaiter; | |
| 233 friend class VMStructs; | |
| 234 | |
| 235 // WARNING: this must be the very first word of ObjectMonitor | |
| 236 // This means this class can't use any virtual member functions. | |
| 237 // TODO-FIXME: assert that offsetof(_header) is 0 or get rid of the | |
| 238 // implicit 0 offset in emitted code. | |
| 239 | |
| 240 volatile markOop _header; // displaced object header word - mark | |
| 241 void* volatile _object; // backward object pointer - strong root | |
| 242 | |
| 243 double SharingPad [1] ; // temp to reduce false sharing | |
| 244 | |
| 245 // All the following fields must be machine word aligned | |
| 246 // The VM assumes write ordering wrt these fields, which can be | |
| 247 // read from other threads. | |
| 248 | |
| 1878 | 249 protected: // protected for jvmtiRawMonitor |
| 0 | 250 void * volatile _owner; // pointer to owning thread OR BasicLock |
| 10405 | 251 volatile jlong _previous_owner_tid; // thread id of the previous owner of the monitor |
| 0 | 252 volatile intptr_t _recursions; // recursion count, 0 for first entry |
| 1878 | 253 private: |
| 0 | 254 int OwnerIsThread ; // _owner is (Thread *) vs SP/BasicLock |
| 255 ObjectWaiter * volatile _cxq ; // LL of recently-arrived threads blocked on entry. | |
| 256 // The list is actually composed of WaitNodes, acting | |
| 257 // as proxies for Threads. | |
| 1878 | 258 protected: |
| 0 | 259 ObjectWaiter * volatile _EntryList ; // Threads blocked on entry or reentry. |
| 1878 | 260 private: |
| 0 | 261 Thread * volatile _succ ; // Heir presumptive thread - used for futile wakeup throttling |
| 262 Thread * volatile _Responsible ; | |
| 263 int _PromptDrain ; // rqst to drain cxq into EntryList ASAP | |
| 264 | |
| 265 volatile int _Spinner ; // for exit->spinner handoff optimization | |
| 266 volatile int _SpinFreq ; // Spin 1-out-of-N attempts: success rate | |
| 267 volatile int _SpinClock ; | |
| 268 volatile int _SpinDuration ; | |
| 269 volatile intptr_t _SpinState ; // MCS/CLH list of spinners | |
| 270 | |
| 271 // TODO-FIXME: _count, _waiters and _recursions should be of | |
| 272 // type int, or int32_t but not intptr_t. There's no reason | |
| 273 // to use 64-bit fields for these variables on a 64-bit JVM. | |
| 274 | |
| 275 volatile intptr_t _count; // reference count to prevent reclaimation/deflation | |
| 276 // at stop-the-world time. See deflate_idle_monitors(). | |
| 277 // _count is approximately |_WaitSet| + |_EntryList| | |
| 1878 | 278 protected: |
| 0 | 279 volatile intptr_t _waiters; // number of waiting threads |
| 1878 | 280 private: |
| 281 protected: | |
| 0 | 282 ObjectWaiter * volatile _WaitSet; // LL of threads wait()ing on the monitor |
| 1878 | 283 private: |
| 0 | 284 volatile int _WaitSetLock; // protects Wait Queue - simple spinlock |
| 285 | |
| 286 public: | |
| 287 int _QMix ; // Mixed prepend queue discipline | |
| 288 ObjectMonitor * FreeNext ; // Free list linkage | |
| 289 intptr_t StatA, StatsB ; | |
| 290 | |
| 1878 | 291 public: |
| 292 static void Initialize () ; | |
| 293 static PerfCounter * _sync_ContendedLockAttempts ; | |
| 294 static PerfCounter * _sync_FutileWakeups ; | |
| 295 static PerfCounter * _sync_Parks ; | |
| 296 static PerfCounter * _sync_EmptyNotifications ; | |
| 297 static PerfCounter * _sync_Notifications ; | |
| 298 static PerfCounter * _sync_SlowEnter ; | |
| 299 static PerfCounter * _sync_SlowExit ; | |
| 300 static PerfCounter * _sync_SlowNotify ; | |
| 301 static PerfCounter * _sync_SlowNotifyAll ; | |
| 302 static PerfCounter * _sync_FailedSpins ; | |
| 303 static PerfCounter * _sync_SuccessfulSpins ; | |
| 304 static PerfCounter * _sync_PrivateA ; | |
| 305 static PerfCounter * _sync_PrivateB ; | |
| 306 static PerfCounter * _sync_MonInCirculation ; | |
| 307 static PerfCounter * _sync_MonScavenged ; | |
| 308 static PerfCounter * _sync_Inflations ; | |
| 309 static PerfCounter * _sync_Deflations ; | |
| 310 static PerfLongVariable * _sync_MonExtant ; | |
| 311 | |
| 312 public: | |
| 313 static int Knob_Verbose; | |
| 314 static int Knob_SpinLimit; | |
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315 void* operator new (size_t size) throw() { |
| 10271 | 316 return AllocateHeap(size, mtInternal); |
| 317 } | |
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318 void* operator new[] (size_t size) throw() { |
| 10271 | 319 return operator new (size); |
| 320 } | |
| 321 void operator delete(void* p) { | |
| 322 FreeHeap(p, mtInternal); | |
| 323 } | |
| 324 void operator delete[] (void *p) { | |
| 325 operator delete(p); | |
| 326 } | |
| 0 | 327 }; |
| 1878 | 328 |
| 329 #undef TEVENT | |
| 330 #define TEVENT(nom) {if (SyncVerbose) FEVENT(nom); } | |
| 331 | |
| 332 #define FEVENT(nom) { static volatile int ctr = 0 ; int v = ++ctr ; if ((v & (v-1)) == 0) { ::printf (#nom " : %d \n", v); ::fflush(stdout); }} | |
| 333 | |
| 334 #undef TEVENT | |
| 335 #define TEVENT(nom) {;} | |
| 336 | |
| 1972 | 337 |
| 338 #endif // SHARE_VM_RUNTIME_OBJECTMONITOR_HPP |