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annotate src/share/vm/runtime/objectMonitor.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | fa83ab460c54 |
| children | c760f78e0a53 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1998, 2010, 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" | |
| 29 #include "runtime/perfData.hpp" | |
| 30 | |
| 1878 | 31 |
| 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; | |
| 45 ParkEvent * _event; | |
| 46 volatile int _notified ; | |
| 47 volatile TStates TState ; | |
| 48 Sorted _Sorted ; // List placement disposition | |
| 49 bool _active ; // Contention monitoring is enabled | |
| 50 public: | |
| 51 ObjectWaiter(Thread* thread); | |
| 52 | |
| 53 void wait_reenter_begin(ObjectMonitor *mon); | |
| 54 void wait_reenter_end(ObjectMonitor *mon); | |
| 55 }; | |
| 56 | |
| 0 | 57 // WARNING: |
| 58 // This is a very sensitive and fragile class. DO NOT make any | |
| 59 // change unless you are fully aware of the underlying semantics. | |
| 60 | |
| 61 // This class can not inherit from any other class, because I have | |
| 62 // to let the displaced header be the very first word. Otherwise I | |
| 63 // have to let markOop include this file, which would export the | |
| 64 // monitor data structure to everywhere. | |
| 65 // | |
| 66 // The ObjectMonitor class is used to implement JavaMonitors which have | |
| 67 // transformed from the lightweight structure of the thread stack to a | |
| 68 // heavy weight lock due to contention | |
| 69 | |
| 70 // It is also used as RawMonitor by the JVMTI | |
| 71 | |
| 72 | |
| 73 class ObjectMonitor { | |
| 74 public: | |
| 75 enum { | |
| 76 OM_OK, // no error | |
| 77 OM_SYSTEM_ERROR, // operating system error | |
| 78 OM_ILLEGAL_MONITOR_STATE, // IllegalMonitorStateException | |
| 79 OM_INTERRUPTED, // Thread.interrupt() | |
| 80 OM_TIMED_OUT // Object.wait() timed out | |
| 81 }; | |
| 82 | |
| 83 public: | |
| 84 // TODO-FIXME: the "offset" routines should return a type of off_t instead of int ... | |
| 85 // ByteSize would also be an appropriate type. | |
| 86 static int header_offset_in_bytes() { return offset_of(ObjectMonitor, _header); } | |
| 87 static int object_offset_in_bytes() { return offset_of(ObjectMonitor, _object); } | |
| 88 static int owner_offset_in_bytes() { return offset_of(ObjectMonitor, _owner); } | |
| 89 static int count_offset_in_bytes() { return offset_of(ObjectMonitor, _count); } | |
| 90 static int recursions_offset_in_bytes() { return offset_of(ObjectMonitor, _recursions); } | |
| 91 static int cxq_offset_in_bytes() { return offset_of(ObjectMonitor, _cxq) ; } | |
| 92 static int succ_offset_in_bytes() { return offset_of(ObjectMonitor, _succ) ; } | |
| 93 static int EntryList_offset_in_bytes() { return offset_of(ObjectMonitor, _EntryList); } | |
| 94 static int FreeNext_offset_in_bytes() { return offset_of(ObjectMonitor, FreeNext); } | |
| 95 static int WaitSet_offset_in_bytes() { return offset_of(ObjectMonitor, _WaitSet) ; } | |
| 96 static int Responsible_offset_in_bytes() { return offset_of(ObjectMonitor, _Responsible);} | |
| 97 static int Spinner_offset_in_bytes() { return offset_of(ObjectMonitor, _Spinner); } | |
| 98 | |
| 99 public: | |
| 100 // Eventaully we'll make provisions for multiple callbacks, but | |
| 101 // now one will suffice. | |
| 102 static int (*SpinCallbackFunction)(intptr_t, int) ; | |
| 103 static intptr_t SpinCallbackArgument ; | |
| 104 | |
| 105 | |
| 106 public: | |
| 107 markOop header() const; | |
| 108 void set_header(markOop hdr); | |
| 109 | |
| 1878 | 110 intptr_t is_busy() const { |
| 111 // TODO-FIXME: merge _count and _waiters. | |
| 112 // TODO-FIXME: assert _owner == null implies _recursions = 0 | |
| 113 // TODO-FIXME: assert _WaitSet != null implies _count > 0 | |
| 114 return _count|_waiters|intptr_t(_owner)|intptr_t(_cxq)|intptr_t(_EntryList ) ; | |
| 115 } | |
| 116 | |
| 0 | 117 intptr_t is_entered(Thread* current) const; |
| 118 | |
| 119 void* owner() const; | |
| 120 void set_owner(void* owner); | |
| 121 | |
| 122 intptr_t waiters() const; | |
| 123 | |
| 124 intptr_t count() const; | |
| 125 void set_count(intptr_t count); | |
| 126 intptr_t contentions() const ; | |
| 1878 | 127 intptr_t recursions() const { return _recursions; } |
| 0 | 128 |
| 129 // JVM/DI GetMonitorInfo() needs this | |
| 1878 | 130 ObjectWaiter* first_waiter() { return _WaitSet; } |
| 131 ObjectWaiter* next_waiter(ObjectWaiter* o) { return o->_next; } | |
| 132 Thread* thread_of_waiter(ObjectWaiter* o) { return o->_thread; } | |
| 133 | |
| 134 // initialize the monitor, exception the semaphore, all other fields | |
| 135 // are simple integers or pointers | |
| 136 ObjectMonitor() { | |
| 137 _header = NULL; | |
| 138 _count = 0; | |
| 139 _waiters = 0, | |
| 140 _recursions = 0; | |
| 141 _object = NULL; | |
| 142 _owner = NULL; | |
| 143 _WaitSet = NULL; | |
| 144 _WaitSetLock = 0 ; | |
| 145 _Responsible = NULL ; | |
| 146 _succ = NULL ; | |
| 147 _cxq = NULL ; | |
| 148 FreeNext = NULL ; | |
| 149 _EntryList = NULL ; | |
| 150 _SpinFreq = 0 ; | |
| 151 _SpinClock = 0 ; | |
| 152 OwnerIsThread = 0 ; | |
| 153 } | |
| 0 | 154 |
| 1878 | 155 ~ObjectMonitor() { |
| 156 // TODO: Add asserts ... | |
| 157 // _cxq == 0 _succ == NULL _owner == NULL _waiters == 0 | |
| 158 // _count == 0 _EntryList == NULL etc | |
| 159 } | |
| 160 | |
| 161 private: | |
| 162 void Recycle () { | |
| 163 // TODO: add stronger asserts ... | |
| 164 // _cxq == 0 _succ == NULL _owner == NULL _waiters == 0 | |
| 165 // _count == 0 EntryList == NULL | |
| 166 // _recursions == 0 _WaitSet == NULL | |
| 167 // TODO: assert (is_busy()|_recursions) == 0 | |
| 168 _succ = NULL ; | |
| 169 _EntryList = NULL ; | |
| 170 _cxq = NULL ; | |
| 171 _WaitSet = NULL ; | |
| 172 _recursions = 0 ; | |
| 173 _SpinFreq = 0 ; | |
| 174 _SpinClock = 0 ; | |
| 175 OwnerIsThread = 0 ; | |
| 176 } | |
| 177 | |
| 178 public: | |
| 0 | 179 |
| 180 void* object() const; | |
| 181 void* object_addr(); | |
| 182 void set_object(void* obj); | |
| 183 | |
| 184 bool check(TRAPS); // true if the thread owns the monitor. | |
| 185 void check_slow(TRAPS); | |
| 186 void clear(); | |
| 187 #ifndef PRODUCT | |
| 188 void verify(); | |
| 189 void print(); | |
| 190 #endif | |
| 191 | |
| 192 bool try_enter (TRAPS) ; | |
| 193 void enter(TRAPS); | |
| 194 void exit(TRAPS); | |
| 195 void wait(jlong millis, bool interruptable, TRAPS); | |
| 196 void notify(TRAPS); | |
| 197 void notifyAll(TRAPS); | |
| 198 | |
| 199 // Use the following at your own risk | |
| 200 intptr_t complete_exit(TRAPS); | |
| 201 void reenter(intptr_t recursions, TRAPS); | |
| 202 | |
| 203 private: | |
| 204 void AddWaiter (ObjectWaiter * waiter) ; | |
| 1878 | 205 static void DeferredInitialize(); |
| 0 | 206 |
| 207 ObjectWaiter * DequeueWaiter () ; | |
| 208 void DequeueSpecificWaiter (ObjectWaiter * waiter) ; | |
| 209 void EnterI (TRAPS) ; | |
| 210 void ReenterI (Thread * Self, ObjectWaiter * SelfNode) ; | |
| 211 void UnlinkAfterAcquire (Thread * Self, ObjectWaiter * SelfNode) ; | |
| 212 int TryLock (Thread * Self) ; | |
| 213 int NotRunnable (Thread * Self, Thread * Owner) ; | |
| 214 int TrySpin_Fixed (Thread * Self) ; | |
| 215 int TrySpin_VaryFrequency (Thread * Self) ; | |
| 216 int TrySpin_VaryDuration (Thread * Self) ; | |
| 217 void ctAsserts () ; | |
| 218 void ExitEpilog (Thread * Self, ObjectWaiter * Wakee) ; | |
| 219 bool ExitSuspendEquivalent (JavaThread * Self) ; | |
| 220 | |
| 221 private: | |
| 222 friend class ObjectSynchronizer; | |
| 223 friend class ObjectWaiter; | |
| 224 friend class VMStructs; | |
| 225 | |
| 226 // WARNING: this must be the very first word of ObjectMonitor | |
| 227 // This means this class can't use any virtual member functions. | |
| 228 // TODO-FIXME: assert that offsetof(_header) is 0 or get rid of the | |
| 229 // implicit 0 offset in emitted code. | |
| 230 | |
| 231 volatile markOop _header; // displaced object header word - mark | |
| 232 void* volatile _object; // backward object pointer - strong root | |
| 233 | |
| 234 double SharingPad [1] ; // temp to reduce false sharing | |
| 235 | |
| 236 // All the following fields must be machine word aligned | |
| 237 // The VM assumes write ordering wrt these fields, which can be | |
| 238 // read from other threads. | |
| 239 | |
| 1878 | 240 protected: // protected for jvmtiRawMonitor |
| 0 | 241 void * volatile _owner; // pointer to owning thread OR BasicLock |
| 242 volatile intptr_t _recursions; // recursion count, 0 for first entry | |
| 1878 | 243 private: |
| 0 | 244 int OwnerIsThread ; // _owner is (Thread *) vs SP/BasicLock |
| 245 ObjectWaiter * volatile _cxq ; // LL of recently-arrived threads blocked on entry. | |
| 246 // The list is actually composed of WaitNodes, acting | |
| 247 // as proxies for Threads. | |
| 1878 | 248 protected: |
| 0 | 249 ObjectWaiter * volatile _EntryList ; // Threads blocked on entry or reentry. |
| 1878 | 250 private: |
| 0 | 251 Thread * volatile _succ ; // Heir presumptive thread - used for futile wakeup throttling |
| 252 Thread * volatile _Responsible ; | |
| 253 int _PromptDrain ; // rqst to drain cxq into EntryList ASAP | |
| 254 | |
| 255 volatile int _Spinner ; // for exit->spinner handoff optimization | |
| 256 volatile int _SpinFreq ; // Spin 1-out-of-N attempts: success rate | |
| 257 volatile int _SpinClock ; | |
| 258 volatile int _SpinDuration ; | |
| 259 volatile intptr_t _SpinState ; // MCS/CLH list of spinners | |
| 260 | |
| 261 // TODO-FIXME: _count, _waiters and _recursions should be of | |
| 262 // type int, or int32_t but not intptr_t. There's no reason | |
| 263 // to use 64-bit fields for these variables on a 64-bit JVM. | |
| 264 | |
| 265 volatile intptr_t _count; // reference count to prevent reclaimation/deflation | |
| 266 // at stop-the-world time. See deflate_idle_monitors(). | |
| 267 // _count is approximately |_WaitSet| + |_EntryList| | |
| 1878 | 268 protected: |
| 0 | 269 volatile intptr_t _waiters; // number of waiting threads |
| 1878 | 270 private: |
| 271 protected: | |
| 0 | 272 ObjectWaiter * volatile _WaitSet; // LL of threads wait()ing on the monitor |
| 1878 | 273 private: |
| 0 | 274 volatile int _WaitSetLock; // protects Wait Queue - simple spinlock |
| 275 | |
| 276 public: | |
| 277 int _QMix ; // Mixed prepend queue discipline | |
| 278 ObjectMonitor * FreeNext ; // Free list linkage | |
| 279 intptr_t StatA, StatsB ; | |
| 280 | |
| 1878 | 281 public: |
| 282 static void Initialize () ; | |
| 283 static PerfCounter * _sync_ContendedLockAttempts ; | |
| 284 static PerfCounter * _sync_FutileWakeups ; | |
| 285 static PerfCounter * _sync_Parks ; | |
| 286 static PerfCounter * _sync_EmptyNotifications ; | |
| 287 static PerfCounter * _sync_Notifications ; | |
| 288 static PerfCounter * _sync_SlowEnter ; | |
| 289 static PerfCounter * _sync_SlowExit ; | |
| 290 static PerfCounter * _sync_SlowNotify ; | |
| 291 static PerfCounter * _sync_SlowNotifyAll ; | |
| 292 static PerfCounter * _sync_FailedSpins ; | |
| 293 static PerfCounter * _sync_SuccessfulSpins ; | |
| 294 static PerfCounter * _sync_PrivateA ; | |
| 295 static PerfCounter * _sync_PrivateB ; | |
| 296 static PerfCounter * _sync_MonInCirculation ; | |
| 297 static PerfCounter * _sync_MonScavenged ; | |
| 298 static PerfCounter * _sync_Inflations ; | |
| 299 static PerfCounter * _sync_Deflations ; | |
| 300 static PerfLongVariable * _sync_MonExtant ; | |
| 301 | |
| 302 public: | |
| 303 static int Knob_Verbose; | |
| 304 static int Knob_SpinLimit; | |
| 0 | 305 }; |
| 1878 | 306 |
| 307 #undef TEVENT | |
| 308 #define TEVENT(nom) {if (SyncVerbose) FEVENT(nom); } | |
| 309 | |
| 310 #define FEVENT(nom) { static volatile int ctr = 0 ; int v = ++ctr ; if ((v & (v-1)) == 0) { ::printf (#nom " : %d \n", v); ::fflush(stdout); }} | |
| 311 | |
| 312 #undef TEVENT | |
| 313 #define TEVENT(nom) {;} | |
| 314 | |
| 1972 | 315 |
| 316 #endif // SHARE_VM_RUNTIME_OBJECTMONITOR_HPP |