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annotate src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.hpp @ 21598:05ecef0a6a24
LinearScanLifetimeAnalysisPhase: special case StackStoreOp.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 28 May 2015 13:07:25 +0200 |
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0 | 1 /* |
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2 * Copyright (c) 2002, 2012, 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_GC_IMPLEMENTATION_PARALLELSCAVENGE_GCTASKMANAGER_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GCTASKMANAGER_HPP | |
27 | |
28 #include "runtime/mutex.hpp" | |
29 #include "utilities/growableArray.hpp" | |
30 | |
0 | 31 // |
32 // The GCTaskManager is a queue of GCTasks, and accessors | |
33 // to allow the queue to be accessed from many threads. | |
34 // | |
35 | |
36 // Forward declarations of types defined in this file. | |
37 class GCTask; | |
38 class GCTaskQueue; | |
39 class SynchronizedGCTaskQueue; | |
40 class GCTaskManager; | |
41 class NotifyDoneClosure; | |
42 // Some useful subclasses of GCTask. You can also make up your own. | |
43 class NoopGCTask; | |
44 class BarrierGCTask; | |
45 class ReleasingBarrierGCTask; | |
46 class NotifyingBarrierGCTask; | |
47 class WaitForBarrierGCTask; | |
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48 class IdleGCTask; |
0 | 49 // A free list of Monitor*'s. |
50 class MonitorSupply; | |
51 | |
52 // Forward declarations of classes referenced in this file via pointer. | |
53 class GCTaskThread; | |
54 class Mutex; | |
55 class Monitor; | |
56 class ThreadClosure; | |
57 | |
58 // The abstract base GCTask. | |
59 class GCTask : public ResourceObj { | |
60 public: | |
61 // Known kinds of GCTasks, for predicates. | |
62 class Kind : AllStatic { | |
63 public: | |
64 enum kind { | |
65 unknown_task, | |
66 ordinary_task, | |
67 barrier_task, | |
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68 noop_task, |
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69 idle_task |
0 | 70 }; |
71 static const char* to_string(kind value); | |
72 }; | |
73 private: | |
74 // Instance state. | |
75 const Kind::kind _kind; // For runtime type checking. | |
76 const uint _affinity; // Which worker should run task. | |
77 GCTask* _newer; // Tasks are on doubly-linked ... | |
78 GCTask* _older; // ... lists. | |
79 public: | |
80 virtual char* name() { return (char *)"task"; } | |
81 | |
82 // Abstract do_it method | |
83 virtual void do_it(GCTaskManager* manager, uint which) = 0; | |
84 // Accessors | |
85 Kind::kind kind() const { | |
86 return _kind; | |
87 } | |
88 uint affinity() const { | |
89 return _affinity; | |
90 } | |
91 GCTask* newer() const { | |
92 return _newer; | |
93 } | |
94 void set_newer(GCTask* n) { | |
95 _newer = n; | |
96 } | |
97 GCTask* older() const { | |
98 return _older; | |
99 } | |
100 void set_older(GCTask* p) { | |
101 _older = p; | |
102 } | |
103 // Predicates. | |
104 bool is_ordinary_task() const { | |
105 return kind()==Kind::ordinary_task; | |
106 } | |
107 bool is_barrier_task() const { | |
108 return kind()==Kind::barrier_task; | |
109 } | |
110 bool is_noop_task() const { | |
111 return kind()==Kind::noop_task; | |
112 } | |
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113 bool is_idle_task() const { |
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114 return kind()==Kind::idle_task; |
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115 } |
0 | 116 void print(const char* message) const PRODUCT_RETURN; |
117 protected: | |
118 // Constructors: Only create subclasses. | |
119 // An ordinary GCTask. | |
120 GCTask(); | |
121 // A GCTask of a particular kind, usually barrier or noop. | |
122 GCTask(Kind::kind kind); | |
123 // An ordinary GCTask with an affinity. | |
124 GCTask(uint affinity); | |
125 // A GCTask of a particular kind, with and affinity. | |
126 GCTask(Kind::kind kind, uint affinity); | |
127 // We want a virtual destructor because virtual methods, | |
128 // but since ResourceObj's don't have their destructors | |
129 // called, we don't have one at all. Instead we have | |
130 // this method, which gets called by subclasses to clean up. | |
131 virtual void destruct(); | |
132 // Methods. | |
133 void initialize(); | |
134 }; | |
135 | |
136 // A doubly-linked list of GCTasks. | |
137 // The list is not synchronized, because sometimes we want to | |
138 // build up a list and then make it available to other threads. | |
139 // See also: SynchronizedGCTaskQueue. | |
140 class GCTaskQueue : public ResourceObj { | |
141 private: | |
142 // Instance state. | |
143 GCTask* _insert_end; // Tasks are enqueued at this end. | |
144 GCTask* _remove_end; // Tasks are dequeued from this end. | |
145 uint _length; // The current length of the queue. | |
146 const bool _is_c_heap_obj; // Is this a CHeapObj? | |
147 public: | |
148 // Factory create and destroy methods. | |
149 // Create as ResourceObj. | |
150 static GCTaskQueue* create(); | |
151 // Create as CHeapObj. | |
152 static GCTaskQueue* create_on_c_heap(); | |
153 // Destroyer. | |
154 static void destroy(GCTaskQueue* that); | |
155 // Accessors. | |
156 // These just examine the state of the queue. | |
157 bool is_empty() const { | |
158 assert(((insert_end() == NULL && remove_end() == NULL) || | |
159 (insert_end() != NULL && remove_end() != NULL)), | |
160 "insert_end and remove_end don't match"); | |
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161 assert((insert_end() != NULL) || (_length == 0), "Not empty"); |
0 | 162 return insert_end() == NULL; |
163 } | |
164 uint length() const { | |
165 return _length; | |
166 } | |
167 // Methods. | |
168 // Enqueue one task. | |
169 void enqueue(GCTask* task); | |
170 // Enqueue a list of tasks. Empties the argument list. | |
171 void enqueue(GCTaskQueue* list); | |
172 // Dequeue one task. | |
173 GCTask* dequeue(); | |
174 // Dequeue one task, preferring one with affinity. | |
175 GCTask* dequeue(uint affinity); | |
176 protected: | |
177 // Constructor. Clients use factory, but there might be subclasses. | |
178 GCTaskQueue(bool on_c_heap); | |
179 // Destructor-like method. | |
180 // Because ResourceMark doesn't call destructors. | |
181 // This method cleans up like one. | |
182 virtual void destruct(); | |
183 // Accessors. | |
184 GCTask* insert_end() const { | |
185 return _insert_end; | |
186 } | |
187 void set_insert_end(GCTask* value) { | |
188 _insert_end = value; | |
189 } | |
190 GCTask* remove_end() const { | |
191 return _remove_end; | |
192 } | |
193 void set_remove_end(GCTask* value) { | |
194 _remove_end = value; | |
195 } | |
196 void increment_length() { | |
197 _length += 1; | |
198 } | |
199 void decrement_length() { | |
200 _length -= 1; | |
201 } | |
202 void set_length(uint value) { | |
203 _length = value; | |
204 } | |
205 bool is_c_heap_obj() const { | |
206 return _is_c_heap_obj; | |
207 } | |
208 // Methods. | |
209 void initialize(); | |
210 GCTask* remove(); // Remove from remove end. | |
211 GCTask* remove(GCTask* task); // Remove from the middle. | |
212 void print(const char* message) const PRODUCT_RETURN; | |
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213 // Debug support |
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214 void verify_length() const PRODUCT_RETURN; |
0 | 215 }; |
216 | |
217 // A GCTaskQueue that can be synchronized. | |
218 // This "has-a" GCTaskQueue and a mutex to do the exclusion. | |
6197 | 219 class SynchronizedGCTaskQueue : public CHeapObj<mtGC> { |
0 | 220 private: |
221 // Instance state. | |
222 GCTaskQueue* _unsynchronized_queue; // Has-a unsynchronized queue. | |
223 Monitor * _lock; // Lock to control access. | |
224 public: | |
225 // Factory create and destroy methods. | |
226 static SynchronizedGCTaskQueue* create(GCTaskQueue* queue, Monitor * lock) { | |
227 return new SynchronizedGCTaskQueue(queue, lock); | |
228 } | |
229 static void destroy(SynchronizedGCTaskQueue* that) { | |
230 if (that != NULL) { | |
231 delete that; | |
232 } | |
233 } | |
234 // Accessors | |
235 GCTaskQueue* unsynchronized_queue() const { | |
236 return _unsynchronized_queue; | |
237 } | |
238 Monitor * lock() const { | |
239 return _lock; | |
240 } | |
241 // GCTaskQueue wrapper methods. | |
242 // These check that you hold the lock | |
243 // and then call the method on the queue. | |
244 bool is_empty() const { | |
245 guarantee(own_lock(), "don't own the lock"); | |
246 return unsynchronized_queue()->is_empty(); | |
247 } | |
248 void enqueue(GCTask* task) { | |
249 guarantee(own_lock(), "don't own the lock"); | |
250 unsynchronized_queue()->enqueue(task); | |
251 } | |
252 void enqueue(GCTaskQueue* list) { | |
253 guarantee(own_lock(), "don't own the lock"); | |
254 unsynchronized_queue()->enqueue(list); | |
255 } | |
256 GCTask* dequeue() { | |
257 guarantee(own_lock(), "don't own the lock"); | |
258 return unsynchronized_queue()->dequeue(); | |
259 } | |
260 GCTask* dequeue(uint affinity) { | |
261 guarantee(own_lock(), "don't own the lock"); | |
262 return unsynchronized_queue()->dequeue(affinity); | |
263 } | |
264 uint length() const { | |
265 guarantee(own_lock(), "don't own the lock"); | |
266 return unsynchronized_queue()->length(); | |
267 } | |
268 // For guarantees. | |
269 bool own_lock() const { | |
270 return lock()->owned_by_self(); | |
271 } | |
272 protected: | |
273 // Constructor. Clients use factory, but there might be subclasses. | |
274 SynchronizedGCTaskQueue(GCTaskQueue* queue, Monitor * lock); | |
275 // Destructor. Not virtual because no virtuals. | |
276 ~SynchronizedGCTaskQueue(); | |
277 }; | |
278 | |
279 // This is an abstract base class for getting notifications | |
280 // when a GCTaskManager is done. | |
6197 | 281 class NotifyDoneClosure : public CHeapObj<mtGC> { |
0 | 282 public: |
283 // The notification callback method. | |
284 virtual void notify(GCTaskManager* manager) = 0; | |
285 protected: | |
286 // Constructor. | |
287 NotifyDoneClosure() { | |
288 // Nothing to do. | |
289 } | |
290 // Virtual destructor because virtual methods. | |
291 virtual ~NotifyDoneClosure() { | |
292 // Nothing to do. | |
293 } | |
294 }; | |
295 | |
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296 // Dynamic number of GC threads |
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297 // |
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298 // GC threads wait in get_task() for work (i.e., a task) to perform. |
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299 // When the number of GC threads was static, the number of tasks |
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300 // created to do a job was equal to or greater than the maximum |
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301 // number of GC threads (ParallelGCThreads). The job might be divided |
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302 // into a number of tasks greater than the number of GC threads for |
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303 // load balancing (i.e., over partitioning). The last task to be |
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304 // executed by a GC thread in a job is a work stealing task. A |
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305 // GC thread that gets a work stealing task continues to execute |
14909 | 306 // that task until the job is done. In the static number of GC theads |
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307 // case, tasks are added to a queue (FIFO). The work stealing tasks are |
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308 // the last to be added. Once the tasks are added, the GC threads grab |
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309 // a task and go. A single thread can do all the non-work stealing tasks |
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310 // and then execute a work stealing and wait for all the other GC threads |
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311 // to execute their work stealing task. |
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312 // In the dynamic number of GC threads implementation, idle-tasks are |
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313 // created to occupy the non-participating or "inactive" threads. An |
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314 // idle-task makes the GC thread wait on a barrier that is part of the |
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315 // GCTaskManager. The GC threads that have been "idled" in a IdleGCTask |
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316 // are released once all the active GC threads have finished their work |
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317 // stealing tasks. The GCTaskManager does not wait for all the "idled" |
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318 // GC threads to resume execution. When those GC threads do resume |
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319 // execution in the course of the thread scheduling, they call get_tasks() |
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320 // as all the other GC threads do. Because all the "idled" threads are |
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321 // not required to execute in order to finish a job, it is possible for |
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322 // a GC thread to still be "idled" when the next job is started. Such |
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323 // a thread stays "idled" for the next job. This can result in a new |
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324 // job not having all the expected active workers. For example if on |
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325 // job requests 4 active workers out of a total of 10 workers so the |
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326 // remaining 6 are "idled", if the next job requests 6 active workers |
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327 // but all 6 of the "idled" workers are still idle, then the next job |
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328 // will only get 4 active workers. |
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329 // The implementation for the parallel old compaction phase has an |
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330 // added complication. In the static case parold partitions the chunks |
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331 // ready to be filled into stacks, one for each GC thread. A GC thread |
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332 // executing a draining task (drains the stack of ready chunks) |
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333 // claims a stack according to it's id (the unique ordinal value assigned |
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334 // to each GC thread). In the dynamic case not all GC threads will |
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335 // actively participate so stacks with ready to fill chunks can only be |
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336 // given to the active threads. An initial implementation chose stacks |
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337 // number 1-n to get the ready chunks and required that GC threads |
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338 // 1-n be the active workers. This was undesirable because it required |
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339 // certain threads to participate. In the final implementation a |
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340 // list of stacks equal in number to the active workers are filled |
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341 // with ready chunks. GC threads that participate get a stack from |
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342 // the task (DrainStacksCompactionTask), empty the stack, and then add it to a |
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343 // recycling list at the end of the task. If the same GC thread gets |
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344 // a second task, it gets a second stack to drain and returns it. The |
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345 // stacks are added to a recycling list so that later stealing tasks |
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346 // for this tasks can get a stack from the recycling list. Stealing tasks |
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347 // use the stacks in its work in a way similar to the draining tasks. |
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348 // A thread is not guaranteed to get anything but a stealing task and |
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349 // a thread that only gets a stealing task has to get a stack. A failed |
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350 // implementation tried to have the GC threads keep the stack they used |
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351 // during a draining task for later use in the stealing task but that didn't |
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352 // work because as noted a thread is not guaranteed to get a draining task. |
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353 // |
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354 // For PSScavenge and ParCompactionManager the GC threads are |
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355 // held in the GCTaskThread** _thread array in GCTaskManager. |
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356 |
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357 |
6197 | 358 class GCTaskManager : public CHeapObj<mtGC> { |
0 | 359 friend class ParCompactionManager; |
360 friend class PSParallelCompact; | |
361 friend class PSScavenge; | |
362 friend class PSRefProcTaskExecutor; | |
363 friend class RefProcTaskExecutor; | |
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364 friend class GCTaskThread; |
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365 friend class IdleGCTask; |
0 | 366 private: |
367 // Instance state. | |
368 NotifyDoneClosure* _ndc; // Notify on completion. | |
369 const uint _workers; // Number of workers. | |
370 Monitor* _monitor; // Notification of changes. | |
371 SynchronizedGCTaskQueue* _queue; // Queue of tasks. | |
372 GCTaskThread** _thread; // Array of worker threads. | |
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373 uint _active_workers; // Number of active workers. |
0 | 374 uint _busy_workers; // Number of busy workers. |
375 uint _blocking_worker; // The worker that's blocking. | |
376 bool* _resource_flag; // Array of flag per threads. | |
377 uint _delivered_tasks; // Count of delivered tasks. | |
378 uint _completed_tasks; // Count of completed tasks. | |
379 uint _barriers; // Count of barrier tasks. | |
380 uint _emptied_queue; // Times we emptied the queue. | |
381 NoopGCTask* _noop_task; // The NoopGCTask instance. | |
382 uint _noop_tasks; // Count of noop tasks. | |
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383 WaitForBarrierGCTask* _idle_inactive_task;// Task for inactive workers |
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384 volatile uint _idle_workers; // Number of idled workers |
0 | 385 public: |
386 // Factory create and destroy methods. | |
387 static GCTaskManager* create(uint workers) { | |
388 return new GCTaskManager(workers); | |
389 } | |
390 static GCTaskManager* create(uint workers, NotifyDoneClosure* ndc) { | |
391 return new GCTaskManager(workers, ndc); | |
392 } | |
393 static void destroy(GCTaskManager* that) { | |
394 if (that != NULL) { | |
395 delete that; | |
396 } | |
397 } | |
398 // Accessors. | |
399 uint busy_workers() const { | |
400 return _busy_workers; | |
401 } | |
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402 volatile uint idle_workers() const { |
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403 return _idle_workers; |
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404 } |
0 | 405 // Pun between Monitor* and Mutex* |
406 Monitor* monitor() const { | |
407 return _monitor; | |
408 } | |
409 Monitor * lock() const { | |
410 return _monitor; | |
411 } | |
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412 WaitForBarrierGCTask* idle_inactive_task() { |
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413 return _idle_inactive_task; |
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414 } |
0 | 415 // Methods. |
416 // Add the argument task to be run. | |
417 void add_task(GCTask* task); | |
418 // Add a list of tasks. Removes task from the argument list. | |
419 void add_list(GCTaskQueue* list); | |
420 // Claim a task for argument worker. | |
421 GCTask* get_task(uint which); | |
422 // Note the completion of a task by the argument worker. | |
423 void note_completion(uint which); | |
424 // Is the queue blocked from handing out new tasks? | |
425 bool is_blocked() const { | |
426 return (blocking_worker() != sentinel_worker()); | |
427 } | |
428 // Request that all workers release their resources. | |
429 void release_all_resources(); | |
430 // Ask if a particular worker should release its resources. | |
431 bool should_release_resources(uint which); // Predicate. | |
432 // Note the release of resources by the argument worker. | |
433 void note_release(uint which); | |
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434 // Create IdleGCTasks for inactive workers and start workers |
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435 void task_idle_workers(); |
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436 // Release the workers in IdleGCTasks |
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437 void release_idle_workers(); |
0 | 438 // Constants. |
439 // A sentinel worker identifier. | |
440 static uint sentinel_worker() { | |
441 return (uint) -1; // Why isn't there a max_uint? | |
442 } | |
443 | |
444 // Execute the task queue and wait for the completion. | |
445 void execute_and_wait(GCTaskQueue* list); | |
446 | |
447 void print_task_time_stamps(); | |
448 void print_threads_on(outputStream* st); | |
449 void threads_do(ThreadClosure* tc); | |
450 | |
451 protected: | |
452 // Constructors. Clients use factory, but there might be subclasses. | |
453 // Create a GCTaskManager with the appropriate number of workers. | |
454 GCTaskManager(uint workers); | |
455 // Create a GCTaskManager that calls back when there's no more work. | |
456 GCTaskManager(uint workers, NotifyDoneClosure* ndc); | |
457 // Make virtual if necessary. | |
458 ~GCTaskManager(); | |
459 // Accessors. | |
460 uint workers() const { | |
461 return _workers; | |
462 } | |
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463 void set_active_workers(uint v) { |
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464 assert(v <= _workers, "Trying to set more workers active than there are"); |
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465 _active_workers = MIN2(v, _workers); |
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466 assert(v != 0, "Trying to set active workers to 0"); |
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467 _active_workers = MAX2(1U, _active_workers); |
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468 } |
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469 // Sets the number of threads that will be used in a collection |
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470 void set_active_gang(); |
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471 |
0 | 472 NotifyDoneClosure* notify_done_closure() const { |
473 return _ndc; | |
474 } | |
475 SynchronizedGCTaskQueue* queue() const { | |
476 return _queue; | |
477 } | |
478 NoopGCTask* noop_task() const { | |
479 return _noop_task; | |
480 } | |
481 // Bounds-checking per-thread data accessors. | |
482 GCTaskThread* thread(uint which); | |
483 void set_thread(uint which, GCTaskThread* value); | |
484 bool resource_flag(uint which); | |
485 void set_resource_flag(uint which, bool value); | |
486 // Modifier methods with some semantics. | |
487 // Is any worker blocking handing out new tasks? | |
488 uint blocking_worker() const { | |
489 return _blocking_worker; | |
490 } | |
491 void set_blocking_worker(uint value) { | |
492 _blocking_worker = value; | |
493 } | |
494 void set_unblocked() { | |
495 set_blocking_worker(sentinel_worker()); | |
496 } | |
497 // Count of busy workers. | |
498 void reset_busy_workers() { | |
499 _busy_workers = 0; | |
500 } | |
501 uint increment_busy_workers(); | |
502 uint decrement_busy_workers(); | |
503 // Count of tasks delivered to workers. | |
504 uint delivered_tasks() const { | |
505 return _delivered_tasks; | |
506 } | |
507 void increment_delivered_tasks() { | |
508 _delivered_tasks += 1; | |
509 } | |
510 void reset_delivered_tasks() { | |
511 _delivered_tasks = 0; | |
512 } | |
513 // Count of tasks completed by workers. | |
514 uint completed_tasks() const { | |
515 return _completed_tasks; | |
516 } | |
517 void increment_completed_tasks() { | |
518 _completed_tasks += 1; | |
519 } | |
520 void reset_completed_tasks() { | |
521 _completed_tasks = 0; | |
522 } | |
523 // Count of barrier tasks completed. | |
524 uint barriers() const { | |
525 return _barriers; | |
526 } | |
527 void increment_barriers() { | |
528 _barriers += 1; | |
529 } | |
530 void reset_barriers() { | |
531 _barriers = 0; | |
532 } | |
533 // Count of how many times the queue has emptied. | |
534 uint emptied_queue() const { | |
535 return _emptied_queue; | |
536 } | |
537 void increment_emptied_queue() { | |
538 _emptied_queue += 1; | |
539 } | |
540 void reset_emptied_queue() { | |
541 _emptied_queue = 0; | |
542 } | |
543 // Count of the number of noop tasks we've handed out, | |
544 // e.g., to handle resource release requests. | |
545 uint noop_tasks() const { | |
546 return _noop_tasks; | |
547 } | |
548 void increment_noop_tasks() { | |
549 _noop_tasks += 1; | |
550 } | |
551 void reset_noop_tasks() { | |
552 _noop_tasks = 0; | |
553 } | |
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554 void increment_idle_workers() { |
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555 _idle_workers++; |
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556 } |
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557 void decrement_idle_workers() { |
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558 _idle_workers--; |
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559 } |
0 | 560 // Other methods. |
561 void initialize(); | |
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562 |
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563 public: |
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564 // Return true if all workers are currently active. |
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565 bool all_workers_active() { return workers() == active_workers(); } |
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566 uint active_workers() const { |
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567 return _active_workers; |
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568 } |
0 | 569 }; |
570 | |
571 // | |
572 // Some exemplary GCTasks. | |
573 // | |
574 | |
575 // A noop task that does nothing, | |
576 // except take us around the GCTaskThread loop. | |
577 class NoopGCTask : public GCTask { | |
578 private: | |
579 const bool _is_c_heap_obj; // Is this a CHeapObj? | |
580 public: | |
581 // Factory create and destroy methods. | |
582 static NoopGCTask* create(); | |
583 static NoopGCTask* create_on_c_heap(); | |
584 static void destroy(NoopGCTask* that); | |
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585 |
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586 virtual char* name() { return (char *)"noop task"; } |
0 | 587 // Methods from GCTask. |
588 void do_it(GCTaskManager* manager, uint which) { | |
589 // Nothing to do. | |
590 } | |
591 protected: | |
592 // Constructor. | |
593 NoopGCTask(bool on_c_heap) : | |
594 GCTask(GCTask::Kind::noop_task), | |
595 _is_c_heap_obj(on_c_heap) { | |
596 // Nothing to do. | |
597 } | |
598 // Destructor-like method. | |
599 void destruct(); | |
600 // Accessors. | |
601 bool is_c_heap_obj() const { | |
602 return _is_c_heap_obj; | |
603 } | |
604 }; | |
605 | |
606 // A BarrierGCTask blocks other tasks from starting, | |
607 // and waits until it is the only task running. | |
608 class BarrierGCTask : public GCTask { | |
609 public: | |
610 // Factory create and destroy methods. | |
611 static BarrierGCTask* create() { | |
612 return new BarrierGCTask(); | |
613 } | |
614 static void destroy(BarrierGCTask* that) { | |
615 if (that != NULL) { | |
616 that->destruct(); | |
617 delete that; | |
618 } | |
619 } | |
620 // Methods from GCTask. | |
621 void do_it(GCTaskManager* manager, uint which); | |
622 protected: | |
623 // Constructor. Clients use factory, but there might be subclasses. | |
624 BarrierGCTask() : | |
625 GCTask(GCTask::Kind::barrier_task) { | |
626 // Nothing to do. | |
627 } | |
628 // Destructor-like method. | |
629 void destruct(); | |
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630 |
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631 virtual char* name() { return (char *)"barrier task"; } |
0 | 632 // Methods. |
633 // Wait for this to be the only task running. | |
634 void do_it_internal(GCTaskManager* manager, uint which); | |
635 }; | |
636 | |
637 // A ReleasingBarrierGCTask is a BarrierGCTask | |
638 // that tells all the tasks to release their resource areas. | |
639 class ReleasingBarrierGCTask : public BarrierGCTask { | |
640 public: | |
641 // Factory create and destroy methods. | |
642 static ReleasingBarrierGCTask* create() { | |
643 return new ReleasingBarrierGCTask(); | |
644 } | |
645 static void destroy(ReleasingBarrierGCTask* that) { | |
646 if (that != NULL) { | |
647 that->destruct(); | |
648 delete that; | |
649 } | |
650 } | |
651 // Methods from GCTask. | |
652 void do_it(GCTaskManager* manager, uint which); | |
653 protected: | |
654 // Constructor. Clients use factory, but there might be subclasses. | |
655 ReleasingBarrierGCTask() : | |
656 BarrierGCTask() { | |
657 // Nothing to do. | |
658 } | |
659 // Destructor-like method. | |
660 void destruct(); | |
661 }; | |
662 | |
663 // A NotifyingBarrierGCTask is a BarrierGCTask | |
664 // that calls a notification method when it is the only task running. | |
665 class NotifyingBarrierGCTask : public BarrierGCTask { | |
666 private: | |
667 // Instance state. | |
668 NotifyDoneClosure* _ndc; // The callback object. | |
669 public: | |
670 // Factory create and destroy methods. | |
671 static NotifyingBarrierGCTask* create(NotifyDoneClosure* ndc) { | |
672 return new NotifyingBarrierGCTask(ndc); | |
673 } | |
674 static void destroy(NotifyingBarrierGCTask* that) { | |
675 if (that != NULL) { | |
676 that->destruct(); | |
677 delete that; | |
678 } | |
679 } | |
680 // Methods from GCTask. | |
681 void do_it(GCTaskManager* manager, uint which); | |
682 protected: | |
683 // Constructor. Clients use factory, but there might be subclasses. | |
684 NotifyingBarrierGCTask(NotifyDoneClosure* ndc) : | |
685 BarrierGCTask(), | |
686 _ndc(ndc) { | |
687 assert(notify_done_closure() != NULL, "can't notify on NULL"); | |
688 } | |
689 // Destructor-like method. | |
690 void destruct(); | |
691 // Accessor. | |
692 NotifyDoneClosure* notify_done_closure() const { return _ndc; } | |
693 }; | |
694 | |
695 // A WaitForBarrierGCTask is a BarrierGCTask | |
696 // with a method you can call to wait until | |
697 // the BarrierGCTask is done. | |
698 // This may cover many of the uses of NotifyingBarrierGCTasks. | |
699 class WaitForBarrierGCTask : public BarrierGCTask { | |
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700 friend class GCTaskManager; |
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701 friend class IdleGCTask; |
0 | 702 private: |
703 // Instance state. | |
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704 Monitor* _monitor; // Guard and notify changes. |
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705 volatile bool _should_wait; // true=>wait, false=>proceed. |
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706 const bool _is_c_heap_obj; // Was allocated on the heap. |
0 | 707 public: |
708 virtual char* name() { return (char *) "waitfor-barrier-task"; } | |
709 | |
710 // Factory create and destroy methods. | |
711 static WaitForBarrierGCTask* create(); | |
712 static WaitForBarrierGCTask* create_on_c_heap(); | |
713 static void destroy(WaitForBarrierGCTask* that); | |
714 // Methods. | |
715 void do_it(GCTaskManager* manager, uint which); | |
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716 void wait_for(bool reset); |
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717 void set_should_wait(bool value) { |
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718 _should_wait = value; |
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719 } |
0 | 720 protected: |
721 // Constructor. Clients use factory, but there might be subclasses. | |
722 WaitForBarrierGCTask(bool on_c_heap); | |
723 // Destructor-like method. | |
724 void destruct(); | |
725 // Accessors. | |
726 Monitor* monitor() const { | |
727 return _monitor; | |
728 } | |
729 bool should_wait() const { | |
730 return _should_wait; | |
731 } | |
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732 bool is_c_heap_obj() { |
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733 return _is_c_heap_obj; |
0 | 734 } |
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735 }; |
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736 |
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737 // Task that is used to idle a GC task when fewer than |
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738 // the maximum workers are wanted. |
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739 class IdleGCTask : public GCTask { |
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740 const bool _is_c_heap_obj; // Was allocated on the heap. |
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741 public: |
0 | 742 bool is_c_heap_obj() { |
743 return _is_c_heap_obj; | |
744 } | |
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745 // Factory create and destroy methods. |
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746 static IdleGCTask* create(); |
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747 static IdleGCTask* create_on_c_heap(); |
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748 static void destroy(IdleGCTask* that); |
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749 |
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750 virtual char* name() { return (char *)"idle task"; } |
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751 // Methods from GCTask. |
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752 virtual void do_it(GCTaskManager* manager, uint which); |
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753 protected: |
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754 // Constructor. |
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755 IdleGCTask(bool on_c_heap) : |
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756 GCTask(GCTask::Kind::idle_task), |
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757 _is_c_heap_obj(on_c_heap) { |
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758 // Nothing to do. |
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759 } |
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760 // Destructor-like method. |
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761 void destruct(); |
0 | 762 }; |
763 | |
764 class MonitorSupply : public AllStatic { | |
765 private: | |
766 // State. | |
767 // Control multi-threaded access. | |
768 static Mutex* _lock; | |
769 // The list of available Monitor*'s. | |
770 static GrowableArray<Monitor*>* _freelist; | |
771 public: | |
772 // Reserve a Monitor*. | |
773 static Monitor* reserve(); | |
774 // Release a Monitor*. | |
775 static void release(Monitor* instance); | |
776 private: | |
777 // Accessors. | |
778 static Mutex* lock() { | |
779 return _lock; | |
780 } | |
781 static GrowableArray<Monitor*>* freelist() { | |
782 return _freelist; | |
783 } | |
784 }; | |
1972 | 785 |
786 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GCTASKMANAGER_HPP |