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annotate src/share/vm/runtime/objectMonitor.hpp @ 3202:9352a9c26095
revert outer framesate scheduling change
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Fri, 08 Jul 2011 18:00:39 +0200 |
parents | c760f78e0a53 |
children | f9be75d21404 |
rev | line source |
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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 * | |
1552
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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" | |
1983
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29 #include "runtime/park.hpp" |
1972 | 30 #include "runtime/perfData.hpp" |
31 | |
1878 | 32 |
33 // ObjectWaiter serves as a "proxy" or surrogate thread. | |
34 // TODO-FIXME: Eliminate ObjectWaiter and use the thread-specific | |
35 // ParkEvent instead. Beware, however, that the JVMTI code | |
36 // knows about ObjectWaiters, so we'll have to reconcile that code. | |
37 // See next_waiter(), first_waiter(), etc. | |
38 | |
39 class ObjectWaiter : public StackObj { | |
40 public: | |
41 enum TStates { TS_UNDEF, TS_READY, TS_RUN, TS_WAIT, TS_ENTER, TS_CXQ } ; | |
42 enum Sorted { PREPEND, APPEND, SORTED } ; | |
43 ObjectWaiter * volatile _next; | |
44 ObjectWaiter * volatile _prev; | |
45 Thread* _thread; | |
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 | |
0 | 58 // WARNING: |
59 // This is a very sensitive and fragile class. DO NOT make any | |
60 // change unless you are fully aware of the underlying semantics. | |
61 | |
62 // This class can not inherit from any other class, because I have | |
63 // to let the displaced header be the very first word. Otherwise I | |
64 // have to let markOop include this file, which would export the | |
65 // monitor data structure to everywhere. | |
66 // | |
67 // The ObjectMonitor class is used to implement JavaMonitors which have | |
68 // transformed from the lightweight structure of the thread stack to a | |
69 // heavy weight lock due to contention | |
70 | |
71 // It is also used as RawMonitor by the JVMTI | |
72 | |
73 | |
74 class ObjectMonitor { | |
75 public: | |
76 enum { | |
77 OM_OK, // no error | |
78 OM_SYSTEM_ERROR, // operating system error | |
79 OM_ILLEGAL_MONITOR_STATE, // IllegalMonitorStateException | |
80 OM_INTERRUPTED, // Thread.interrupt() | |
81 OM_TIMED_OUT // Object.wait() timed out | |
82 }; | |
83 | |
84 public: | |
85 // TODO-FIXME: the "offset" routines should return a type of off_t instead of int ... | |
86 // ByteSize would also be an appropriate type. | |
87 static int header_offset_in_bytes() { return offset_of(ObjectMonitor, _header); } | |
88 static int object_offset_in_bytes() { return offset_of(ObjectMonitor, _object); } | |
89 static int owner_offset_in_bytes() { return offset_of(ObjectMonitor, _owner); } | |
90 static int count_offset_in_bytes() { return offset_of(ObjectMonitor, _count); } | |
91 static int recursions_offset_in_bytes() { return offset_of(ObjectMonitor, _recursions); } | |
92 static int cxq_offset_in_bytes() { return offset_of(ObjectMonitor, _cxq) ; } | |
93 static int succ_offset_in_bytes() { return offset_of(ObjectMonitor, _succ) ; } | |
94 static int EntryList_offset_in_bytes() { return offset_of(ObjectMonitor, _EntryList); } | |
95 static int FreeNext_offset_in_bytes() { return offset_of(ObjectMonitor, FreeNext); } | |
96 static int WaitSet_offset_in_bytes() { return offset_of(ObjectMonitor, _WaitSet) ; } | |
97 static int Responsible_offset_in_bytes() { return offset_of(ObjectMonitor, _Responsible);} | |
98 static int Spinner_offset_in_bytes() { return offset_of(ObjectMonitor, _Spinner); } | |
99 | |
100 public: | |
101 // Eventaully we'll make provisions for multiple callbacks, but | |
102 // now one will suffice. | |
103 static int (*SpinCallbackFunction)(intptr_t, int) ; | |
104 static intptr_t SpinCallbackArgument ; | |
105 | |
106 | |
107 public: | |
108 markOop header() const; | |
109 void set_header(markOop hdr); | |
110 | |
1878 | 111 intptr_t is_busy() const { |
112 // TODO-FIXME: merge _count and _waiters. | |
113 // TODO-FIXME: assert _owner == null implies _recursions = 0 | |
114 // TODO-FIXME: assert _WaitSet != null implies _count > 0 | |
115 return _count|_waiters|intptr_t(_owner)|intptr_t(_cxq)|intptr_t(_EntryList ) ; | |
116 } | |
117 | |
0 | 118 intptr_t is_entered(Thread* current) const; |
119 | |
120 void* owner() const; | |
121 void set_owner(void* owner); | |
122 | |
123 intptr_t waiters() const; | |
124 | |
125 intptr_t count() const; | |
126 void set_count(intptr_t count); | |
127 intptr_t contentions() const ; | |
1878 | 128 intptr_t recursions() const { return _recursions; } |
0 | 129 |
130 // JVM/DI GetMonitorInfo() needs this | |
1878 | 131 ObjectWaiter* first_waiter() { return _WaitSet; } |
132 ObjectWaiter* next_waiter(ObjectWaiter* o) { return o->_next; } | |
133 Thread* thread_of_waiter(ObjectWaiter* o) { return o->_thread; } | |
134 | |
135 // initialize the monitor, exception the semaphore, all other fields | |
136 // are simple integers or pointers | |
137 ObjectMonitor() { | |
138 _header = NULL; | |
139 _count = 0; | |
140 _waiters = 0, | |
141 _recursions = 0; | |
142 _object = NULL; | |
143 _owner = NULL; | |
144 _WaitSet = NULL; | |
145 _WaitSetLock = 0 ; | |
146 _Responsible = NULL ; | |
147 _succ = NULL ; | |
148 _cxq = NULL ; | |
149 FreeNext = NULL ; | |
150 _EntryList = NULL ; | |
151 _SpinFreq = 0 ; | |
152 _SpinClock = 0 ; | |
153 OwnerIsThread = 0 ; | |
154 } | |
0 | 155 |
1878 | 156 ~ObjectMonitor() { |
157 // TODO: Add asserts ... | |
158 // _cxq == 0 _succ == NULL _owner == NULL _waiters == 0 | |
159 // _count == 0 _EntryList == NULL etc | |
160 } | |
161 | |
162 private: | |
163 void Recycle () { | |
164 // TODO: add stronger asserts ... | |
165 // _cxq == 0 _succ == NULL _owner == NULL _waiters == 0 | |
166 // _count == 0 EntryList == NULL | |
167 // _recursions == 0 _WaitSet == NULL | |
168 // TODO: assert (is_busy()|_recursions) == 0 | |
169 _succ = NULL ; | |
170 _EntryList = NULL ; | |
171 _cxq = NULL ; | |
172 _WaitSet = NULL ; | |
173 _recursions = 0 ; | |
174 _SpinFreq = 0 ; | |
175 _SpinClock = 0 ; | |
176 OwnerIsThread = 0 ; | |
177 } | |
178 | |
179 public: | |
0 | 180 |
181 void* object() const; | |
182 void* object_addr(); | |
183 void set_object(void* obj); | |
184 | |
185 bool check(TRAPS); // true if the thread owns the monitor. | |
186 void check_slow(TRAPS); | |
187 void clear(); | |
188 #ifndef PRODUCT | |
189 void verify(); | |
190 void print(); | |
191 #endif | |
192 | |
193 bool try_enter (TRAPS) ; | |
194 void enter(TRAPS); | |
195 void exit(TRAPS); | |
196 void wait(jlong millis, bool interruptable, TRAPS); | |
197 void notify(TRAPS); | |
198 void notifyAll(TRAPS); | |
199 | |
200 // Use the following at your own risk | |
201 intptr_t complete_exit(TRAPS); | |
202 void reenter(intptr_t recursions, TRAPS); | |
203 | |
204 private: | |
205 void AddWaiter (ObjectWaiter * waiter) ; | |
1878 | 206 static void DeferredInitialize(); |
0 | 207 |
208 ObjectWaiter * DequeueWaiter () ; | |
209 void DequeueSpecificWaiter (ObjectWaiter * waiter) ; | |
210 void EnterI (TRAPS) ; | |
211 void ReenterI (Thread * Self, ObjectWaiter * SelfNode) ; | |
212 void UnlinkAfterAcquire (Thread * Self, ObjectWaiter * SelfNode) ; | |
213 int TryLock (Thread * Self) ; | |
214 int NotRunnable (Thread * Self, Thread * Owner) ; | |
215 int TrySpin_Fixed (Thread * Self) ; | |
216 int TrySpin_VaryFrequency (Thread * Self) ; | |
217 int TrySpin_VaryDuration (Thread * Self) ; | |
218 void ctAsserts () ; | |
219 void ExitEpilog (Thread * Self, ObjectWaiter * Wakee) ; | |
220 bool ExitSuspendEquivalent (JavaThread * Self) ; | |
221 | |
222 private: | |
223 friend class ObjectSynchronizer; | |
224 friend class ObjectWaiter; | |
225 friend class VMStructs; | |
226 | |
227 // WARNING: this must be the very first word of ObjectMonitor | |
228 // This means this class can't use any virtual member functions. | |
229 // TODO-FIXME: assert that offsetof(_header) is 0 or get rid of the | |
230 // implicit 0 offset in emitted code. | |
231 | |
232 volatile markOop _header; // displaced object header word - mark | |
233 void* volatile _object; // backward object pointer - strong root | |
234 | |
235 double SharingPad [1] ; // temp to reduce false sharing | |
236 | |
237 // All the following fields must be machine word aligned | |
238 // The VM assumes write ordering wrt these fields, which can be | |
239 // read from other threads. | |
240 | |
1878 | 241 protected: // protected for jvmtiRawMonitor |
0 | 242 void * volatile _owner; // pointer to owning thread OR BasicLock |
243 volatile intptr_t _recursions; // recursion count, 0 for first entry | |
1878 | 244 private: |
0 | 245 int OwnerIsThread ; // _owner is (Thread *) vs SP/BasicLock |
246 ObjectWaiter * volatile _cxq ; // LL of recently-arrived threads blocked on entry. | |
247 // The list is actually composed of WaitNodes, acting | |
248 // as proxies for Threads. | |
1878 | 249 protected: |
0 | 250 ObjectWaiter * volatile _EntryList ; // Threads blocked on entry or reentry. |
1878 | 251 private: |
0 | 252 Thread * volatile _succ ; // Heir presumptive thread - used for futile wakeup throttling |
253 Thread * volatile _Responsible ; | |
254 int _PromptDrain ; // rqst to drain cxq into EntryList ASAP | |
255 | |
256 volatile int _Spinner ; // for exit->spinner handoff optimization | |
257 volatile int _SpinFreq ; // Spin 1-out-of-N attempts: success rate | |
258 volatile int _SpinClock ; | |
259 volatile int _SpinDuration ; | |
260 volatile intptr_t _SpinState ; // MCS/CLH list of spinners | |
261 | |
262 // TODO-FIXME: _count, _waiters and _recursions should be of | |
263 // type int, or int32_t but not intptr_t. There's no reason | |
264 // to use 64-bit fields for these variables on a 64-bit JVM. | |
265 | |
266 volatile intptr_t _count; // reference count to prevent reclaimation/deflation | |
267 // at stop-the-world time. See deflate_idle_monitors(). | |
268 // _count is approximately |_WaitSet| + |_EntryList| | |
1878 | 269 protected: |
0 | 270 volatile intptr_t _waiters; // number of waiting threads |
1878 | 271 private: |
272 protected: | |
0 | 273 ObjectWaiter * volatile _WaitSet; // LL of threads wait()ing on the monitor |
1878 | 274 private: |
0 | 275 volatile int _WaitSetLock; // protects Wait Queue - simple spinlock |
276 | |
277 public: | |
278 int _QMix ; // Mixed prepend queue discipline | |
279 ObjectMonitor * FreeNext ; // Free list linkage | |
280 intptr_t StatA, StatsB ; | |
281 | |
1878 | 282 public: |
283 static void Initialize () ; | |
284 static PerfCounter * _sync_ContendedLockAttempts ; | |
285 static PerfCounter * _sync_FutileWakeups ; | |
286 static PerfCounter * _sync_Parks ; | |
287 static PerfCounter * _sync_EmptyNotifications ; | |
288 static PerfCounter * _sync_Notifications ; | |
289 static PerfCounter * _sync_SlowEnter ; | |
290 static PerfCounter * _sync_SlowExit ; | |
291 static PerfCounter * _sync_SlowNotify ; | |
292 static PerfCounter * _sync_SlowNotifyAll ; | |
293 static PerfCounter * _sync_FailedSpins ; | |
294 static PerfCounter * _sync_SuccessfulSpins ; | |
295 static PerfCounter * _sync_PrivateA ; | |
296 static PerfCounter * _sync_PrivateB ; | |
297 static PerfCounter * _sync_MonInCirculation ; | |
298 static PerfCounter * _sync_MonScavenged ; | |
299 static PerfCounter * _sync_Inflations ; | |
300 static PerfCounter * _sync_Deflations ; | |
301 static PerfLongVariable * _sync_MonExtant ; | |
302 | |
303 public: | |
304 static int Knob_Verbose; | |
305 static int Knob_SpinLimit; | |
0 | 306 }; |
1878 | 307 |
308 #undef TEVENT | |
309 #define TEVENT(nom) {if (SyncVerbose) FEVENT(nom); } | |
310 | |
311 #define FEVENT(nom) { static volatile int ctr = 0 ; int v = ++ctr ; if ((v & (v-1)) == 0) { ::printf (#nom " : %d \n", v); ::fflush(stdout); }} | |
312 | |
313 #undef TEVENT | |
314 #define TEVENT(nom) {;} | |
315 | |
1972 | 316 |
317 #endif // SHARE_VM_RUNTIME_OBJECTMONITOR_HPP |