28 |
|
* most tasks spawn other subtasks (as do most ForkJoinTasks), as well |
29 |
|
* as the mixed execution of some plain Runnable- or Callable- based |
30 |
|
* activities along with ForkJoinTasks. When setting |
31 |
< |
* <tt>setAsyncMode</tt>, a ForkJoinPools may also be appropriate for |
31 |
> |
* {@code setAsyncMode}, a ForkJoinPools may also be appropriate for |
32 |
|
* use with fine-grained tasks that are never joined. Otherwise, other |
33 |
|
* ExecutorService implementations are typically more appropriate |
34 |
|
* choices. |
38 |
|
* adding, suspending, or resuming threads, even if some tasks are |
39 |
|
* waiting to join others. However, no such adjustments are performed |
40 |
|
* in the face of blocked IO or other unmanaged synchronization. The |
41 |
< |
* nested <code>ManagedBlocker</code> interface enables extension of |
41 |
> |
* nested {@code ManagedBlocker} interface enables extension of |
42 |
|
* the kinds of synchronization accommodated. The target parallelism |
43 |
< |
* level may also be changed dynamically (<code>setParallelism</code>) |
43 |
> |
* level may also be changed dynamically ({@code setParallelism}) |
44 |
|
* and thread construction can be limited using methods |
45 |
< |
* <code>setMaximumPoolSize</code> and/or |
46 |
< |
* <code>setMaintainsParallelism</code>. |
45 |
> |
* {@code setMaximumPoolSize} and/or |
46 |
> |
* {@code setMaintainsParallelism}. |
47 |
|
* |
48 |
|
* <p>In addition to execution and lifecycle control methods, this |
49 |
|
* class provides status check methods (for example |
50 |
< |
* <code>getStealCount</code>) that are intended to aid in developing, |
50 |
> |
* {@code getStealCount}) that are intended to aid in developing, |
51 |
|
* tuning, and monitoring fork/join applications. Also, method |
52 |
< |
* <code>toString</code> returns indications of pool state in a |
52 |
> |
* {@code toString} returns indications of pool state in a |
53 |
|
* convenient form for informal monitoring. |
54 |
|
* |
55 |
|
* <p><b>Implementation notes</b>: This implementation restricts the |
56 |
|
* maximum number of running threads to 32767. Attempts to create |
57 |
|
* pools with greater than the maximum result in |
58 |
|
* IllegalArgumentExceptions. |
59 |
+ |
* |
60 |
+ |
* @since 1.7 |
61 |
+ |
* @author Doug Lea |
62 |
|
*/ |
63 |
|
public class ForkJoinPool extends AbstractExecutorService { |
64 |
|
|
84 |
|
* Returns a new worker thread operating in the given pool. |
85 |
|
* |
86 |
|
* @param pool the pool this thread works in |
87 |
< |
* @throws NullPointerException if pool is null; |
87 |
> |
* @throws NullPointerException if pool is null |
88 |
|
*/ |
89 |
|
public ForkJoinWorkerThread newThread(ForkJoinPool pool); |
90 |
|
} |
91 |
|
|
92 |
|
/** |
93 |
< |
* Default ForkJoinWorkerThreadFactory implementation, creates a |
93 |
> |
* Default ForkJoinWorkerThreadFactory implementation; creates a |
94 |
|
* new ForkJoinWorkerThread. |
95 |
|
*/ |
96 |
|
static class DefaultForkJoinWorkerThreadFactory |
156 |
|
|
157 |
|
/** |
158 |
|
* The uncaught exception handler used when any worker |
159 |
< |
* abrupty terminates |
159 |
> |
* abruptly terminates |
160 |
|
*/ |
161 |
|
private Thread.UncaughtExceptionHandler ueh; |
162 |
|
|
184 |
|
private final LinkedTransferQueue<ForkJoinTask<?>> submissionQueue; |
185 |
|
|
186 |
|
/** |
187 |
< |
* Head of Treiber stack for barrier sync. See below for explanation |
187 |
> |
* Head of Treiber stack for barrier sync. See below for explanation. |
188 |
|
*/ |
189 |
|
private volatile WaitQueueNode syncStack; |
190 |
|
|
220 |
|
* making decisions about creating and suspending spare |
221 |
|
* threads. Updated only by CAS. Note: CASes in |
222 |
|
* updateRunningCount and preJoin assume that running active count |
223 |
< |
* is in low word, so need to be modified if this changes |
223 |
> |
* is in low word, so need to be modified if this changes. |
224 |
|
*/ |
225 |
|
private volatile int workerCounts; |
226 |
|
|
229 |
|
private static int workerCountsFor(int t, int r) { return (t << 16) + r; } |
230 |
|
|
231 |
|
/** |
232 |
< |
* Add delta (which may be negative) to running count. This must |
232 |
> |
* Adds delta (which may be negative) to running count. This must |
233 |
|
* be called before (with negative arg) and after (with positive) |
234 |
< |
* any managed synchronization (i.e., mainly, joins) |
234 |
> |
* any managed synchronization (i.e., mainly, joins). |
235 |
> |
* |
236 |
|
* @param delta the number to add |
237 |
|
*/ |
238 |
|
final void updateRunningCount(int delta) { |
239 |
|
int s; |
240 |
< |
do;while (!casWorkerCounts(s = workerCounts, s + delta)); |
240 |
> |
do {} while (!casWorkerCounts(s = workerCounts, s + delta)); |
241 |
|
} |
242 |
|
|
243 |
|
/** |
244 |
< |
* Add delta (which may be negative) to both total and running |
244 |
> |
* Adds delta (which may be negative) to both total and running |
245 |
|
* count. This must be called upon creation and termination of |
246 |
|
* worker threads. |
247 |
+ |
* |
248 |
|
* @param delta the number to add |
249 |
|
*/ |
250 |
|
private void updateWorkerCount(int delta) { |
251 |
|
int d = delta + (delta << 16); // add to both lo and hi parts |
252 |
|
int s; |
253 |
< |
do;while (!casWorkerCounts(s = workerCounts, s + d)); |
253 |
> |
do {} while (!casWorkerCounts(s = workerCounts, s + d)); |
254 |
|
} |
255 |
|
|
256 |
|
/** |
276 |
|
private static int runControlFor(int r, int a) { return (r << 16) + a; } |
277 |
|
|
278 |
|
/** |
279 |
< |
* Try incrementing active count; fail on contention. Called by |
280 |
< |
* workers before/during executing tasks. |
281 |
< |
* @return true on success; |
279 |
> |
* Tries incrementing active count; fails on contention. |
280 |
> |
* Called by workers before/during executing tasks. |
281 |
> |
* |
282 |
> |
* @return true on success |
283 |
|
*/ |
284 |
|
final boolean tryIncrementActiveCount() { |
285 |
|
int c = runControl; |
287 |
|
} |
288 |
|
|
289 |
|
/** |
290 |
< |
* Try decrementing active count; fail on contention. |
291 |
< |
* Possibly trigger termination on success |
290 |
> |
* Tries decrementing active count; fails on contention. |
291 |
> |
* Possibly triggers termination on success. |
292 |
|
* Called by workers when they can't find tasks. |
293 |
+ |
* |
294 |
|
* @return true on success |
295 |
|
*/ |
296 |
|
final boolean tryDecrementActiveCount() { |
304 |
|
} |
305 |
|
|
306 |
|
/** |
307 |
< |
* Return true if argument represents zero active count and |
307 |
> |
* Returns true if argument represents zero active count and |
308 |
|
* nonzero runstate, which is the triggering condition for |
309 |
|
* terminating on shutdown. |
310 |
|
*/ |
311 |
|
private static boolean canTerminateOnShutdown(int c) { |
312 |
< |
return ((c & -c) >>> 16) != 0; // i.e. least bit is nonzero runState bit |
312 |
> |
// i.e. least bit is nonzero runState bit |
313 |
> |
return ((c & -c) >>> 16) != 0; |
314 |
|
} |
315 |
|
|
316 |
|
/** |
336 |
|
|
337 |
|
/** |
338 |
|
* Creates a ForkJoinPool with a pool size equal to the number of |
339 |
< |
* processors available on the system and using the default |
340 |
< |
* ForkJoinWorkerThreadFactory, |
339 |
> |
* processors available on the system, using the default |
340 |
> |
* ForkJoinWorkerThreadFactory. |
341 |
> |
* |
342 |
|
* @throws SecurityException if a security manager exists and |
343 |
|
* the caller is not permitted to modify threads |
344 |
|
* because it does not hold {@link |
345 |
< |
* java.lang.RuntimePermission}<code>("modifyThread")</code>, |
345 |
> |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
346 |
|
*/ |
347 |
|
public ForkJoinPool() { |
348 |
|
this(Runtime.getRuntime().availableProcessors(), |
350 |
|
} |
351 |
|
|
352 |
|
/** |
353 |
< |
* Creates a ForkJoinPool with the indicated parellelism level |
354 |
< |
* threads, and using the default ForkJoinWorkerThreadFactory, |
353 |
> |
* Creates a ForkJoinPool with the indicated parallelism level |
354 |
> |
* threads and using the default ForkJoinWorkerThreadFactory. |
355 |
> |
* |
356 |
|
* @param parallelism the number of worker threads |
357 |
|
* @throws IllegalArgumentException if parallelism less than or |
358 |
|
* equal to zero |
359 |
|
* @throws SecurityException if a security manager exists and |
360 |
|
* the caller is not permitted to modify threads |
361 |
|
* because it does not hold {@link |
362 |
< |
* java.lang.RuntimePermission}<code>("modifyThread")</code>, |
362 |
> |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
363 |
|
*/ |
364 |
|
public ForkJoinPool(int parallelism) { |
365 |
|
this(parallelism, defaultForkJoinWorkerThreadFactory); |
368 |
|
/** |
369 |
|
* Creates a ForkJoinPool with parallelism equal to the number of |
370 |
|
* processors available on the system and using the given |
371 |
< |
* ForkJoinWorkerThreadFactory, |
371 |
> |
* ForkJoinWorkerThreadFactory. |
372 |
> |
* |
373 |
|
* @param factory the factory for creating new threads |
374 |
|
* @throws NullPointerException if factory is null |
375 |
|
* @throws SecurityException if a security manager exists and |
376 |
|
* the caller is not permitted to modify threads |
377 |
|
* because it does not hold {@link |
378 |
< |
* java.lang.RuntimePermission}<code>("modifyThread")</code>, |
378 |
> |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
379 |
|
*/ |
380 |
|
public ForkJoinPool(ForkJoinWorkerThreadFactory factory) { |
381 |
|
this(Runtime.getRuntime().availableProcessors(), factory); |
387 |
|
* @param parallelism the targeted number of worker threads |
388 |
|
* @param factory the factory for creating new threads |
389 |
|
* @throws IllegalArgumentException if parallelism less than or |
390 |
< |
* equal to zero, or greater than implementation limit. |
390 |
> |
* equal to zero, or greater than implementation limit |
391 |
|
* @throws NullPointerException if factory is null |
392 |
|
* @throws SecurityException if a security manager exists and |
393 |
|
* the caller is not permitted to modify threads |
394 |
|
* because it does not hold {@link |
395 |
< |
* java.lang.RuntimePermission}<code>("modifyThread")</code>, |
395 |
> |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
396 |
|
*/ |
397 |
|
public ForkJoinPool(int parallelism, ForkJoinWorkerThreadFactory factory) { |
398 |
|
if (parallelism <= 0 || parallelism > MAX_THREADS) |
413 |
|
} |
414 |
|
|
415 |
|
/** |
416 |
< |
* Create new worker using factory. |
416 |
> |
* Creates a new worker thread using factory. |
417 |
> |
* |
418 |
|
* @param index the index to assign worker |
419 |
|
* @return new worker, or null of factory failed |
420 |
|
*/ |
433 |
|
} |
434 |
|
|
435 |
|
/** |
436 |
< |
* Return a good size for worker array given pool size. |
436 |
> |
* Returns a good size for worker array given pool size. |
437 |
|
* Currently requires size to be a power of two. |
438 |
|
*/ |
439 |
< |
private static int arraySizeFor(int ps) { |
440 |
< |
return ps <= 1? 1 : (1 << (32 - Integer.numberOfLeadingZeros(ps-1))); |
439 |
> |
private static int arraySizeFor(int poolSize) { |
440 |
> |
return (poolSize <= 1) ? 1 : |
441 |
> |
(1 << (32 - Integer.numberOfLeadingZeros(poolSize-1))); |
442 |
|
} |
443 |
|
|
444 |
|
/** |
445 |
< |
* Create or resize array if necessary to hold newLength. |
446 |
< |
* Call only under exclusion |
445 |
> |
* Creates or resizes array if necessary to hold newLength. |
446 |
> |
* Call only under exclusion. |
447 |
> |
* |
448 |
|
* @return the array |
449 |
|
*/ |
450 |
|
private ForkJoinWorkerThread[] ensureWorkerArrayCapacity(int newLength) { |
458 |
|
} |
459 |
|
|
460 |
|
/** |
461 |
< |
* Try to shrink workers into smaller array after one or more terminate |
461 |
> |
* Tries to shrink workers into smaller array after one or more terminate. |
462 |
|
*/ |
463 |
|
private void tryShrinkWorkerArray() { |
464 |
|
ForkJoinWorkerThread[] ws = workers; |
474 |
|
} |
475 |
|
|
476 |
|
/** |
477 |
< |
* Initialize workers if necessary |
477 |
> |
* Initializes workers if necessary. |
478 |
|
*/ |
479 |
|
final void ensureWorkerInitialization() { |
480 |
|
ForkJoinWorkerThread[] ws = workers; |
550 |
|
} |
551 |
|
|
552 |
|
/** |
553 |
< |
* Performs the given task; returning its result upon completion |
553 |
> |
* Performs the given task, returning its result upon completion. |
554 |
> |
* |
555 |
|
* @param task the task |
556 |
|
* @return the task's result |
557 |
|
* @throws NullPointerException if task is null |
564 |
|
|
565 |
|
/** |
566 |
|
* Arranges for (asynchronous) execution of the given task. |
567 |
+ |
* |
568 |
|
* @param task the task |
569 |
|
* @throws NullPointerException if task is null |
570 |
|
* @throws RejectedExecutionException if pool is shut down |
599 |
|
|
600 |
|
/** |
601 |
|
* Adaptor for Runnables. This implements RunnableFuture |
602 |
< |
* to be compliant with AbstractExecutorService constraints |
602 |
> |
* to be compliant with AbstractExecutorService constraints. |
603 |
|
*/ |
604 |
|
static final class AdaptedRunnable<T> extends ForkJoinTask<T> |
605 |
|
implements RunnableFuture<T> { |
619 |
|
return true; |
620 |
|
} |
621 |
|
public void run() { invoke(); } |
622 |
+ |
private static final long serialVersionUID = 5232453952276885070L; |
623 |
|
} |
624 |
|
|
625 |
|
/** |
648 |
|
} |
649 |
|
} |
650 |
|
public void run() { invoke(); } |
651 |
+ |
private static final long serialVersionUID = 2838392045355241008L; |
652 |
|
} |
653 |
|
|
654 |
|
public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks) { |
655 |
< |
ArrayList<ForkJoinTask<T>> ts = |
655 |
> |
ArrayList<ForkJoinTask<T>> forkJoinTasks = |
656 |
|
new ArrayList<ForkJoinTask<T>>(tasks.size()); |
657 |
< |
for (Callable<T> c : tasks) |
658 |
< |
ts.add(new AdaptedCallable<T>(c)); |
659 |
< |
invoke(new InvokeAll<T>(ts)); |
660 |
< |
return (List<Future<T>>)(List)ts; |
657 |
> |
for (Callable<T> task : tasks) |
658 |
> |
forkJoinTasks.add(new AdaptedCallable<T>(task)); |
659 |
> |
invoke(new InvokeAll<T>(forkJoinTasks)); |
660 |
> |
|
661 |
> |
@SuppressWarnings({"unchecked", "rawtypes"}) |
662 |
> |
List<Future<T>> futures = (List<Future<T>>) (List) forkJoinTasks; |
663 |
> |
return futures; |
664 |
|
} |
665 |
|
|
666 |
|
static final class InvokeAll<T> extends RecursiveAction { |
667 |
|
final ArrayList<ForkJoinTask<T>> tasks; |
668 |
|
InvokeAll(ArrayList<ForkJoinTask<T>> tasks) { this.tasks = tasks; } |
669 |
|
public void compute() { |
670 |
< |
try { invokeAll(tasks); } catch(Exception ignore) {} |
670 |
> |
try { invokeAll(tasks); } |
671 |
> |
catch (Exception ignore) {} |
672 |
|
} |
673 |
+ |
private static final long serialVersionUID = -7914297376763021607L; |
674 |
|
} |
675 |
|
|
676 |
|
// Configuration and status settings and queries |
677 |
|
|
678 |
|
/** |
679 |
< |
* Returns the factory used for constructing new workers |
679 |
> |
* Returns the factory used for constructing new workers. |
680 |
|
* |
681 |
|
* @return the factory used for constructing new workers |
682 |
|
*/ |
687 |
|
/** |
688 |
|
* Returns the handler for internal worker threads that terminate |
689 |
|
* due to unrecoverable errors encountered while executing tasks. |
690 |
+ |
* |
691 |
|
* @return the handler, or null if none |
692 |
|
*/ |
693 |
|
public Thread.UncaughtExceptionHandler getUncaughtExceptionHandler() { |
713 |
|
* @throws SecurityException if a security manager exists and |
714 |
|
* the caller is not permitted to modify threads |
715 |
|
* because it does not hold {@link |
716 |
< |
* java.lang.RuntimePermission}<code>("modifyThread")</code>, |
716 |
> |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
717 |
|
*/ |
718 |
|
public Thread.UncaughtExceptionHandler |
719 |
|
setUncaughtExceptionHandler(Thread.UncaughtExceptionHandler h) { |
740 |
|
|
741 |
|
|
742 |
|
/** |
743 |
< |
* Sets the target paralleism level of this pool. |
743 |
> |
* Sets the target parallelism level of this pool. |
744 |
> |
* |
745 |
|
* @param parallelism the target parallelism |
746 |
|
* @throws IllegalArgumentException if parallelism less than or |
747 |
< |
* equal to zero or greater than maximum size bounds. |
747 |
> |
* equal to zero or greater than maximum size bounds |
748 |
|
* @throws SecurityException if a security manager exists and |
749 |
|
* the caller is not permitted to modify threads |
750 |
|
* because it does not hold {@link |
751 |
< |
* java.lang.RuntimePermission}<code>("modifyThread")</code>, |
751 |
> |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
752 |
|
*/ |
753 |
|
public void setParallelism(int parallelism) { |
754 |
|
checkPermission(); |
783 |
|
/** |
784 |
|
* Returns the number of worker threads that have started but not |
785 |
|
* yet terminated. This result returned by this method may differ |
786 |
< |
* from <code>getParallelism</code> when threads are created to |
786 |
> |
* from {@code getParallelism} when threads are created to |
787 |
|
* maintain parallelism when others are cooperatively blocked. |
788 |
|
* |
789 |
|
* @return the number of worker threads |
795 |
|
/** |
796 |
|
* Returns the maximum number of threads allowed to exist in the |
797 |
|
* pool, even if there are insufficient unblocked running threads. |
798 |
+ |
* |
799 |
|
* @return the maximum |
800 |
|
*/ |
801 |
|
public int getMaximumPoolSize() { |
807 |
|
* pool, even if there are insufficient unblocked running threads. |
808 |
|
* Setting this value has no effect on current pool size. It |
809 |
|
* controls construction of new threads. |
810 |
+ |
* |
811 |
|
* @throws IllegalArgumentException if negative or greater then |
812 |
< |
* internal implementation limit. |
812 |
> |
* internal implementation limit |
813 |
|
*/ |
814 |
|
public void setMaximumPoolSize(int newMax) { |
815 |
|
if (newMax < 0 || newMax > MAX_THREADS) |
822 |
|
* Returns true if this pool dynamically maintains its target |
823 |
|
* parallelism level. If false, new threads are added only to |
824 |
|
* avoid possible starvation. |
825 |
< |
* This setting is by default true; |
825 |
> |
* This setting is by default true. |
826 |
> |
* |
827 |
|
* @return true if maintains parallelism |
828 |
|
*/ |
829 |
|
public boolean getMaintainsParallelism() { |
834 |
|
* Sets whether this pool dynamically maintains its target |
835 |
|
* parallelism level. If false, new threads are added only to |
836 |
|
* avoid possible starvation. |
837 |
+ |
* |
838 |
|
* @param enable true to maintains parallelism |
839 |
|
*/ |
840 |
|
public void setMaintainsParallelism(boolean enable) { |
848 |
|
* worker threads only process asynchronous tasks. This method is |
849 |
|
* designed to be invoked only when pool is quiescent, and |
850 |
|
* typically only before any tasks are submitted. The effects of |
851 |
< |
* invocations at ather times may be unpredictable. |
851 |
> |
* invocations at other times may be unpredictable. |
852 |
|
* |
853 |
|
* @param async if true, use locally FIFO scheduling |
854 |
< |
* @return the previous mode. |
854 |
> |
* @return the previous mode |
855 |
|
*/ |
856 |
|
public boolean setAsyncMode(boolean async) { |
857 |
|
boolean oldMode = locallyFifo; |
869 |
|
|
870 |
|
/** |
871 |
|
* Returns true if this pool uses local first-in-first-out |
872 |
< |
* scheduling mode for forked tasks that are never joined. |
872 |
> |
* scheduling mode for forked tasks that are never joined. |
873 |
|
* |
874 |
< |
* @return true if this pool uses async mode. |
874 |
> |
* @return true if this pool uses async mode |
875 |
|
*/ |
876 |
|
public boolean getAsyncMode() { |
877 |
|
return locallyFifo; |
892 |
|
* Returns an estimate of the number of threads that are currently |
893 |
|
* stealing or executing tasks. This method may overestimate the |
894 |
|
* number of active threads. |
895 |
< |
* @return the number of active threads. |
895 |
> |
* |
896 |
> |
* @return the number of active threads |
897 |
|
*/ |
898 |
|
public int getActiveThreadCount() { |
899 |
|
return activeCountOf(runControl); |
903 |
|
* Returns an estimate of the number of threads that are currently |
904 |
|
* idle waiting for tasks. This method may underestimate the |
905 |
|
* number of idle threads. |
906 |
< |
* @return the number of idle threads. |
906 |
> |
* |
907 |
> |
* @return the number of idle threads |
908 |
|
*/ |
909 |
|
final int getIdleThreadCount() { |
910 |
|
int c = runningCountOf(workerCounts) - activeCountOf(runControl); |
911 |
< |
return (c <= 0)? 0 : c; |
911 |
> |
return (c <= 0) ? 0 : c; |
912 |
|
} |
913 |
|
|
914 |
|
/** |
915 |
|
* Returns true if all worker threads are currently idle. An idle |
916 |
|
* worker is one that cannot obtain a task to execute because none |
917 |
|
* are available to steal from other threads, and there are no |
918 |
< |
* pending submissions to the pool. This method is conservative: |
919 |
< |
* It might not return true immediately upon idleness of all |
918 |
> |
* pending submissions to the pool. This method is conservative; |
919 |
> |
* it might not return true immediately upon idleness of all |
920 |
|
* threads, but will eventually become true if threads remain |
921 |
|
* inactive. |
922 |
+ |
* |
923 |
|
* @return true if all threads are currently idle |
924 |
|
*/ |
925 |
|
public boolean isQuiescent() { |
931 |
|
* one thread's work queue by another. The reported value |
932 |
|
* underestimates the actual total number of steals when the pool |
933 |
|
* is not quiescent. This value may be useful for monitoring and |
934 |
< |
* tuning fork/join programs: In general, steal counts should be |
934 |
> |
* tuning fork/join programs: in general, steal counts should be |
935 |
|
* high enough to keep threads busy, but low enough to avoid |
936 |
|
* overhead and contention across threads. |
937 |
< |
* @return the number of steals. |
937 |
> |
* |
938 |
> |
* @return the number of steals |
939 |
|
*/ |
940 |
|
public long getStealCount() { |
941 |
|
return stealCount.get(); |
942 |
|
} |
943 |
|
|
944 |
|
/** |
945 |
< |
* Accumulate steal count from a worker. Call only |
946 |
< |
* when worker known to be idle. |
945 |
> |
* Accumulates steal count from a worker. |
946 |
> |
* Call only when worker known to be idle. |
947 |
|
*/ |
948 |
|
private void updateStealCount(ForkJoinWorkerThread w) { |
949 |
|
int sc = w.getAndClearStealCount(); |
958 |
|
* an approximation, obtained by iterating across all threads in |
959 |
|
* the pool. This method may be useful for tuning task |
960 |
|
* granularities. |
961 |
< |
* @return the number of queued tasks. |
961 |
> |
* |
962 |
> |
* @return the number of queued tasks |
963 |
|
*/ |
964 |
|
public long getQueuedTaskCount() { |
965 |
|
long count = 0; |
978 |
|
* Returns an estimate of the number tasks submitted to this pool |
979 |
|
* that have not yet begun executing. This method takes time |
980 |
|
* proportional to the number of submissions. |
981 |
< |
* @return the number of queued submissions. |
981 |
> |
* |
982 |
> |
* @return the number of queued submissions |
983 |
|
*/ |
984 |
|
public int getQueuedSubmissionCount() { |
985 |
|
return submissionQueue.size(); |
988 |
|
/** |
989 |
|
* Returns true if there are any tasks submitted to this pool |
990 |
|
* that have not yet begun executing. |
991 |
< |
* @return <code>true</code> if there are any queued submissions. |
991 |
> |
* |
992 |
> |
* @return {@code true} if there are any queued submissions |
993 |
|
*/ |
994 |
|
public boolean hasQueuedSubmissions() { |
995 |
|
return !submissionQueue.isEmpty(); |
999 |
|
* Removes and returns the next unexecuted submission if one is |
1000 |
|
* available. This method may be useful in extensions to this |
1001 |
|
* class that re-assign work in systems with multiple pools. |
1002 |
+ |
* |
1003 |
|
* @return the next submission, or null if none |
1004 |
|
*/ |
1005 |
|
protected ForkJoinTask<?> pollSubmission() { |
1010 |
|
* Removes all available unexecuted submitted and forked tasks |
1011 |
|
* from scheduling queues and adds them to the given collection, |
1012 |
|
* without altering their execution status. These may include |
1013 |
< |
* artifically generated or wrapped tasks. This method id designed |
1013 |
> |
* artificially generated or wrapped tasks. This method is designed |
1014 |
|
* to be invoked only when the pool is known to be |
1015 |
|
* quiescent. Invocations at other times may not remove all |
1016 |
|
* tasks. A failure encountered while attempting to add elements |
1017 |
< |
* to collection <tt>c</tt> may result in elements being in |
1017 |
> |
* to collection {@code c} may result in elements being in |
1018 |
|
* neither, either or both collections when the associated |
1019 |
|
* exception is thrown. The behavior of this operation is |
1020 |
|
* undefined if the specified collection is modified while the |
1021 |
|
* operation is in progress. |
1022 |
+ |
* |
1023 |
|
* @param c the collection to transfer elements into |
1024 |
|
* @return the number of elements transferred |
1025 |
|
*/ |
1080 |
|
* Invocation has no additional effect if already shut down. |
1081 |
|
* Tasks that are in the process of being submitted concurrently |
1082 |
|
* during the course of this method may or may not be rejected. |
1083 |
+ |
* |
1084 |
|
* @throws SecurityException if a security manager exists and |
1085 |
|
* the caller is not permitted to modify threads |
1086 |
|
* because it does not hold {@link |
1087 |
< |
* java.lang.RuntimePermission}<code>("modifyThread")</code>, |
1087 |
> |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
1088 |
|
*/ |
1089 |
|
public void shutdown() { |
1090 |
|
checkPermission(); |
1100 |
|
* method may or may not be rejected. Unlike some other executors, |
1101 |
|
* this method cancels rather than collects non-executed tasks |
1102 |
|
* upon termination, so always returns an empty list. However, you |
1103 |
< |
* can use method <code>drainTasksTo</code> before invoking this |
1103 |
> |
* can use method {@code drainTasksTo} before invoking this |
1104 |
|
* method to transfer unexecuted tasks to another collection. |
1105 |
+ |
* |
1106 |
|
* @return an empty list |
1107 |
|
* @throws SecurityException if a security manager exists and |
1108 |
|
* the caller is not permitted to modify threads |
1109 |
|
* because it does not hold {@link |
1110 |
< |
* java.lang.RuntimePermission}<code>("modifyThread")</code>, |
1110 |
> |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
1111 |
|
*/ |
1112 |
|
public List<Runnable> shutdownNow() { |
1113 |
|
checkPermission(); |
1116 |
|
} |
1117 |
|
|
1118 |
|
/** |
1119 |
< |
* Returns <code>true</code> if all tasks have completed following shut down. |
1119 |
> |
* Returns {@code true} if all tasks have completed following shut down. |
1120 |
|
* |
1121 |
< |
* @return <code>true</code> if all tasks have completed following shut down |
1121 |
> |
* @return {@code true} if all tasks have completed following shut down |
1122 |
|
*/ |
1123 |
|
public boolean isTerminated() { |
1124 |
|
return runStateOf(runControl) == TERMINATED; |
1125 |
|
} |
1126 |
|
|
1127 |
|
/** |
1128 |
< |
* Returns <code>true</code> if the process of termination has |
1128 |
> |
* Returns {@code true} if the process of termination has |
1129 |
|
* commenced but possibly not yet completed. |
1130 |
|
* |
1131 |
< |
* @return <code>true</code> if terminating |
1131 |
> |
* @return {@code true} if terminating |
1132 |
|
*/ |
1133 |
|
public boolean isTerminating() { |
1134 |
|
return runStateOf(runControl) >= TERMINATING; |
1135 |
|
} |
1136 |
|
|
1137 |
|
/** |
1138 |
< |
* Returns <code>true</code> if this pool has been shut down. |
1138 |
> |
* Returns {@code true} if this pool has been shut down. |
1139 |
|
* |
1140 |
< |
* @return <code>true</code> if this pool has been shut down |
1140 |
> |
* @return {@code true} if this pool has been shut down |
1141 |
|
*/ |
1142 |
|
public boolean isShutdown() { |
1143 |
|
return runStateOf(runControl) >= SHUTDOWN; |
1150 |
|
* |
1151 |
|
* @param timeout the maximum time to wait |
1152 |
|
* @param unit the time unit of the timeout argument |
1153 |
< |
* @return <code>true</code> if this executor terminated and |
1154 |
< |
* <code>false</code> if the timeout elapsed before termination |
1153 |
> |
* @return {@code true} if this executor terminated and |
1154 |
> |
* {@code false} if the timeout elapsed before termination |
1155 |
|
* @throws InterruptedException if interrupted while waiting |
1156 |
|
*/ |
1157 |
|
public boolean awaitTermination(long timeout, TimeUnit unit) |
1175 |
|
// Shutdown and termination support |
1176 |
|
|
1177 |
|
/** |
1178 |
< |
* Callback from terminating worker. Null out the corresponding |
1179 |
< |
* workers slot, and if terminating, try to terminate, else try to |
1180 |
< |
* shrink workers array. |
1178 |
> |
* Callback from terminating worker. Nulls out the corresponding |
1179 |
> |
* workers slot, and if terminating, tries to terminate; else |
1180 |
> |
* tries to shrink workers array. |
1181 |
> |
* |
1182 |
|
* @param w the worker |
1183 |
|
*/ |
1184 |
|
final void workerTerminated(ForkJoinWorkerThread w) { |
1209 |
|
} |
1210 |
|
|
1211 |
|
/** |
1212 |
< |
* Initiate termination. |
1212 |
> |
* Initiates termination. |
1213 |
|
*/ |
1214 |
|
private void terminate() { |
1215 |
|
if (transitionRunStateTo(TERMINATING)) { |
1224 |
|
} |
1225 |
|
|
1226 |
|
/** |
1227 |
< |
* Possibly terminate when on shutdown state |
1227 |
> |
* Possibly terminates when on shutdown state. |
1228 |
|
*/ |
1229 |
|
private void terminateOnShutdown() { |
1230 |
|
if (!hasQueuedSubmissions() && canTerminateOnShutdown(runControl)) |
1232 |
|
} |
1233 |
|
|
1234 |
|
/** |
1235 |
< |
* Clear out and cancel submissions |
1235 |
> |
* Clears out and cancels submissions. |
1236 |
|
*/ |
1237 |
|
private void cancelQueuedSubmissions() { |
1238 |
|
ForkJoinTask<?> task; |
1241 |
|
} |
1242 |
|
|
1243 |
|
/** |
1244 |
< |
* Clean out worker queues. |
1244 |
> |
* Cleans out worker queues. |
1245 |
|
*/ |
1246 |
|
private void cancelQueuedWorkerTasks() { |
1247 |
|
final ReentrantLock lock = this.workerLock; |
1261 |
|
} |
1262 |
|
|
1263 |
|
/** |
1264 |
< |
* Set each worker's status to terminating. Requires lock to avoid |
1265 |
< |
* conflicts with add/remove |
1264 |
> |
* Sets each worker's status to terminating. Requires lock to avoid |
1265 |
> |
* conflicts with add/remove. |
1266 |
|
*/ |
1267 |
|
private void stopAllWorkers() { |
1268 |
|
final ReentrantLock lock = this.workerLock; |
1282 |
|
} |
1283 |
|
|
1284 |
|
/** |
1285 |
< |
* Interrupt all unterminated workers. This is not required for |
1285 |
> |
* Interrupts all unterminated workers. This is not required for |
1286 |
|
* sake of internal control, but may help unstick user code during |
1287 |
|
* shutdown. |
1288 |
|
*/ |
1352 |
|
} |
1353 |
|
|
1354 |
|
/** |
1355 |
< |
* Wake up waiter, returning false if known to already |
1355 |
> |
* Wakes up waiter, returning false if known to already |
1356 |
|
*/ |
1357 |
|
boolean signal() { |
1358 |
|
ForkJoinWorkerThread t = thread; |
1364 |
|
} |
1365 |
|
|
1366 |
|
/** |
1367 |
< |
* Await release on sync |
1367 |
> |
* Awaits release on sync. |
1368 |
|
*/ |
1369 |
|
void awaitSyncRelease(ForkJoinPool p) { |
1370 |
|
while (thread != null && !p.syncIsReleasable(this)) |
1372 |
|
} |
1373 |
|
|
1374 |
|
/** |
1375 |
< |
* Await resumption as spare |
1375 |
> |
* Awaits resumption as spare. |
1376 |
|
*/ |
1377 |
|
void awaitSpareRelease() { |
1378 |
|
while (thread != null) { |
1386 |
|
* Ensures that no thread is waiting for count to advance from the |
1387 |
|
* current value of eventCount read on entry to this method, by |
1388 |
|
* releasing waiting threads if necessary. |
1389 |
+ |
* |
1390 |
|
* @return the count |
1391 |
|
*/ |
1392 |
|
final long ensureSync() { |
1408 |
|
*/ |
1409 |
|
private void signalIdleWorkers() { |
1410 |
|
long c; |
1411 |
< |
do;while (!casEventCount(c = eventCount, c+1)); |
1411 |
> |
do {} while (!casEventCount(c = eventCount, c+1)); |
1412 |
|
ensureSync(); |
1413 |
|
} |
1414 |
|
|
1415 |
|
/** |
1416 |
< |
* Signal threads waiting to poll a task. Because method sync |
1416 |
> |
* Signals threads waiting to poll a task. Because method sync |
1417 |
|
* rechecks availability, it is OK to only proceed if queue |
1418 |
|
* appears to be non-empty, and OK to skip under contention to |
1419 |
|
* increment count (since some other thread succeeded). |
1432 |
|
* Waits until event count advances from last value held by |
1433 |
|
* caller, or if excess threads, caller is resumed as spare, or |
1434 |
|
* caller or pool is terminating. Updates caller's event on exit. |
1435 |
+ |
* |
1436 |
|
* @param w the calling worker thread |
1437 |
|
*/ |
1438 |
|
final void sync(ForkJoinWorkerThread w) { |
1463 |
|
* Returns true if worker waiting on sync can proceed: |
1464 |
|
* - on signal (thread == null) |
1465 |
|
* - on event count advance (winning race to notify vs signaller) |
1466 |
< |
* - on Interrupt |
1466 |
> |
* - on interrupt |
1467 |
|
* - if the first queued node, we find work available |
1468 |
|
* If node was not signalled and event count not advanced on exit, |
1469 |
|
* then we also help advance event count. |
1470 |
+ |
* |
1471 |
|
* @return true if node can be released |
1472 |
|
*/ |
1473 |
|
final boolean syncIsReleasable(WaitQueueNode node) { |
1502 |
|
// Parallelism maintenance |
1503 |
|
|
1504 |
|
/** |
1505 |
< |
* Decrement running count; if too low, add spare. |
1505 |
> |
* Decrements running count; if too low, adds spare. |
1506 |
|
* |
1507 |
|
* Conceptually, all we need to do here is add or resume a |
1508 |
|
* spare thread when one is about to block (and remove or |
1509 |
|
* suspend it later when unblocked -- see suspendIfSpare). |
1510 |
|
* However, implementing this idea requires coping with |
1511 |
< |
* several problems: We have imperfect information about the |
1511 |
> |
* several problems: we have imperfect information about the |
1512 |
|
* states of threads. Some count updates can and usually do |
1513 |
|
* lag run state changes, despite arrangements to keep them |
1514 |
|
* accurate (for example, when possible, updating counts |
1522 |
|
* only be suspended or removed when they are idle, not |
1523 |
|
* immediately when they aren't needed. So adding threads will |
1524 |
|
* raise parallelism level for longer than necessary. Also, |
1525 |
< |
* FJ applications often enounter highly transient peaks when |
1525 |
> |
* FJ applications often encounter highly transient peaks when |
1526 |
|
* many threads are blocked joining, but for less time than it |
1527 |
|
* takes to create or resume spares. |
1528 |
|
* |
1531 |
|
* target counts, else create only to avoid starvation |
1532 |
|
* @return true if joinMe known to be done |
1533 |
|
*/ |
1534 |
< |
final boolean preJoin(ForkJoinTask<?> joinMe, boolean maintainParallelism) { |
1534 |
> |
final boolean preJoin(ForkJoinTask<?> joinMe, |
1535 |
> |
boolean maintainParallelism) { |
1536 |
|
maintainParallelism &= maintainsParallelism; // overrride |
1537 |
|
boolean dec = false; // true when running count decremented |
1538 |
|
while (spareStack == null || !tryResumeSpare(dec)) { |
1539 |
|
int counts = workerCounts; |
1540 |
< |
if (dec || (dec = casWorkerCounts(counts, --counts))) { // CAS cheat |
1540 |
> |
if (dec || (dec = casWorkerCounts(counts, --counts))) { |
1541 |
> |
// CAS cheat |
1542 |
|
if (!needSpare(counts, maintainParallelism)) |
1543 |
|
break; |
1544 |
|
if (joinMe.status < 0) |
1553 |
|
/** |
1554 |
|
* Same idea as preJoin |
1555 |
|
*/ |
1556 |
< |
final boolean preBlock(ManagedBlocker blocker, boolean maintainParallelism){ |
1556 |
> |
final boolean preBlock(ManagedBlocker blocker, |
1557 |
> |
boolean maintainParallelism) { |
1558 |
|
maintainParallelism &= maintainsParallelism; |
1559 |
|
boolean dec = false; |
1560 |
|
while (spareStack == null || !tryResumeSpare(dec)) { |
1578 |
|
* there is apparently some work to do. This self-limiting rule |
1579 |
|
* means that the more threads that have already been added, the |
1580 |
|
* less parallelism we will tolerate before adding another. |
1581 |
+ |
* |
1582 |
|
* @param counts current worker counts |
1583 |
|
* @param maintainParallelism try to maintain parallelism |
1584 |
|
*/ |
1596 |
|
} |
1597 |
|
|
1598 |
|
/** |
1599 |
< |
* Add a spare worker if lock available and no more than the |
1600 |
< |
* expected numbers of threads exist |
1599 |
> |
* Adds a spare worker if lock available and no more than the |
1600 |
> |
* expected numbers of threads exist. |
1601 |
> |
* |
1602 |
|
* @return true if successful |
1603 |
|
*/ |
1604 |
|
private boolean tryAddSpare(int expectedCounts) { |
1631 |
|
} |
1632 |
|
|
1633 |
|
/** |
1634 |
< |
* Add the kth spare worker. On entry, pool coounts are already |
1634 |
> |
* Adds the kth spare worker. On entry, pool counts are already |
1635 |
|
* adjusted to reflect addition. |
1636 |
|
*/ |
1637 |
|
private void createAndStartSpare(int k) { |
1653 |
|
} |
1654 |
|
|
1655 |
|
/** |
1656 |
< |
* Suspend calling thread w if there are excess threads. Called |
1657 |
< |
* only from sync. Spares are enqueued in a Treiber stack |
1658 |
< |
* using the same WaitQueueNodes as barriers. They are resumed |
1659 |
< |
* mainly in preJoin, but are also woken on pool events that |
1660 |
< |
* require all threads to check run state. |
1656 |
> |
* Suspends calling thread w if there are excess threads. Called |
1657 |
> |
* only from sync. Spares are enqueued in a Treiber stack using |
1658 |
> |
* the same WaitQueueNodes as barriers. They are resumed mainly |
1659 |
> |
* in preJoin, but are also woken on pool events that require all |
1660 |
> |
* threads to check run state. |
1661 |
> |
* |
1662 |
|
* @param w the caller |
1663 |
|
*/ |
1664 |
|
private boolean suspendIfSpare(ForkJoinWorkerThread w) { |
1669 |
|
node = new WaitQueueNode(0, w); |
1670 |
|
if (casWorkerCounts(s, s-1)) { // representation-dependent |
1671 |
|
// push onto stack |
1672 |
< |
do;while (!casSpareStack(node.next = spareStack, node)); |
1672 |
> |
do {} while (!casSpareStack(node.next = spareStack, node)); |
1673 |
|
// block until released by resumeSpare |
1674 |
|
node.awaitSpareRelease(); |
1675 |
|
return true; |
1679 |
|
} |
1680 |
|
|
1681 |
|
/** |
1682 |
< |
* Try to pop and resume a spare thread. |
1682 |
> |
* Tries to pop and resume a spare thread. |
1683 |
> |
* |
1684 |
|
* @param updateCount if true, increment running count on success |
1685 |
|
* @return true if successful |
1686 |
|
*/ |
1698 |
|
} |
1699 |
|
|
1700 |
|
/** |
1701 |
< |
* Pop and resume all spare threads. Same idea as ensureSync. |
1701 |
> |
* Pops and resumes all spare threads. Same idea as ensureSync. |
1702 |
> |
* |
1703 |
|
* @return true if any spares released |
1704 |
|
*/ |
1705 |
|
private boolean resumeAllSpares() { |
1717 |
|
} |
1718 |
|
|
1719 |
|
/** |
1720 |
< |
* Pop and shutdown excessive spare threads. Call only while |
1720 |
> |
* Pops and shuts down excessive spare threads. Call only while |
1721 |
|
* holding lock. This is not guaranteed to eliminate all excess |
1722 |
|
* threads, only those suspended as spares, which are the ones |
1723 |
|
* unlikely to be needed in the future. |
1742 |
|
/** |
1743 |
|
* Interface for extending managed parallelism for tasks running |
1744 |
|
* in ForkJoinPools. A ManagedBlocker provides two methods. |
1745 |
< |
* Method <code>isReleasable</code> must return true if blocking is not |
1746 |
< |
* necessary. Method <code>block</code> blocks the current thread |
1747 |
< |
* if necessary (perhaps internally invoking isReleasable before |
1748 |
< |
* actually blocking.). |
1745 |
> |
* Method {@code isReleasable} must return true if blocking is not |
1746 |
> |
* necessary. Method {@code block} blocks the current thread if |
1747 |
> |
* necessary (perhaps internally invoking {@code isReleasable} |
1748 |
> |
* before actually blocking.). |
1749 |
> |
* |
1750 |
|
* <p>For example, here is a ManagedBlocker based on a |
1751 |
|
* ReentrantLock: |
1752 |
< |
* <pre> |
1753 |
< |
* class ManagedLocker implements ManagedBlocker { |
1754 |
< |
* final ReentrantLock lock; |
1755 |
< |
* boolean hasLock = false; |
1756 |
< |
* ManagedLocker(ReentrantLock lock) { this.lock = lock; } |
1757 |
< |
* public boolean block() { |
1758 |
< |
* if (!hasLock) |
1759 |
< |
* lock.lock(); |
1760 |
< |
* return true; |
1708 |
< |
* } |
1709 |
< |
* public boolean isReleasable() { |
1710 |
< |
* return hasLock || (hasLock = lock.tryLock()); |
1711 |
< |
* } |
1752 |
> |
* <pre> {@code |
1753 |
> |
* class ManagedLocker implements ManagedBlocker { |
1754 |
> |
* final ReentrantLock lock; |
1755 |
> |
* boolean hasLock = false; |
1756 |
> |
* ManagedLocker(ReentrantLock lock) { this.lock = lock; } |
1757 |
> |
* public boolean block() { |
1758 |
> |
* if (!hasLock) |
1759 |
> |
* lock.lock(); |
1760 |
> |
* return true; |
1761 |
|
* } |
1762 |
< |
* </pre> |
1762 |
> |
* public boolean isReleasable() { |
1763 |
> |
* return hasLock || (hasLock = lock.tryLock()); |
1764 |
> |
* } |
1765 |
> |
* }}</pre> |
1766 |
|
*/ |
1767 |
|
public static interface ManagedBlocker { |
1768 |
|
/** |
1769 |
|
* Possibly blocks the current thread, for example waiting for |
1770 |
|
* a lock or condition. |
1771 |
+ |
* |
1772 |
|
* @return true if no additional blocking is necessary (i.e., |
1773 |
< |
* if isReleasable would return true). |
1773 |
> |
* if isReleasable would return true) |
1774 |
|
* @throws InterruptedException if interrupted while waiting |
1775 |
< |
* (the method is not required to do so, but is allowe to). |
1775 |
> |
* (the method is not required to do so, but is allowed to) |
1776 |
|
*/ |
1777 |
|
boolean block() throws InterruptedException; |
1778 |
|
|
1787 |
|
* is a ForkJoinWorkerThread, this method possibly arranges for a |
1788 |
|
* spare thread to be activated if necessary to ensure parallelism |
1789 |
|
* while the current thread is blocked. If |
1790 |
< |
* <code>maintainParallelism</code> is true and the pool supports |
1790 |
> |
* {@code maintainParallelism} is true and the pool supports |
1791 |
|
* it ({@link #getMaintainsParallelism}), this method attempts to |
1792 |
< |
* maintain the pool's nominal parallelism. Otherwise if activates |
1792 |
> |
* maintain the pool's nominal parallelism. Otherwise it activates |
1793 |
|
* a thread only if necessary to avoid complete starvation. This |
1794 |
|
* option may be preferable when blockages use timeouts, or are |
1795 |
|
* almost always brief. |
1796 |
|
* |
1797 |
|
* <p> If the caller is not a ForkJoinTask, this method is behaviorally |
1798 |
|
* equivalent to |
1799 |
< |
* <pre> |
1800 |
< |
* while (!blocker.isReleasable()) |
1801 |
< |
* if (blocker.block()) |
1802 |
< |
* return; |
1803 |
< |
* </pre> |
1799 |
> |
* <pre> {@code |
1800 |
> |
* while (!blocker.isReleasable()) |
1801 |
> |
* if (blocker.block()) |
1802 |
> |
* return; |
1803 |
> |
* }</pre> |
1804 |
|
* If the caller is a ForkJoinTask, then the pool may first |
1805 |
|
* be expanded to ensure parallelism, and later adjusted. |
1806 |
|
* |
1809 |
|
* attempt to maintain the pool's nominal parallelism; otherwise |
1810 |
|
* activate a thread only if necessary to avoid complete |
1811 |
|
* starvation. |
1812 |
< |
* @throws InterruptedException if blocker.block did so. |
1812 |
> |
* @throws InterruptedException if blocker.block did so |
1813 |
|
*/ |
1814 |
|
public static void managedBlock(ManagedBlocker blocker, |
1815 |
|
boolean maintainParallelism) |
1816 |
|
throws InterruptedException { |
1817 |
|
Thread t = Thread.currentThread(); |
1818 |
< |
ForkJoinPool pool = (t instanceof ForkJoinWorkerThread? |
1819 |
< |
((ForkJoinWorkerThread)t).pool : null); |
1818 |
> |
ForkJoinPool pool = ((t instanceof ForkJoinWorkerThread) ? |
1819 |
> |
((ForkJoinWorkerThread) t).pool : null); |
1820 |
|
if (!blocker.isReleasable()) { |
1821 |
|
try { |
1822 |
|
if (pool == null || |
1831 |
|
|
1832 |
|
private static void awaitBlocker(ManagedBlocker blocker) |
1833 |
|
throws InterruptedException { |
1834 |
< |
do;while (!blocker.isReleasable() && !blocker.block()); |
1834 |
> |
do {} while (!blocker.isReleasable() && !blocker.block()); |
1835 |
|
} |
1836 |
|
|
1837 |
|
// AbstractExecutorService overrides |
1838 |
|
|
1839 |
|
protected <T> RunnableFuture<T> newTaskFor(Runnable runnable, T value) { |
1840 |
< |
return new AdaptedRunnable(runnable, value); |
1840 |
> |
return new AdaptedRunnable<T>(runnable, value); |
1841 |
|
} |
1842 |
|
|
1843 |
|
protected <T> RunnableFuture<T> newTaskFor(Callable<T> callable) { |
1844 |
< |
return new AdaptedCallable(callable); |
1844 |
> |
return new AdaptedCallable<T>(callable); |
1845 |
|
} |
1846 |
|
|
1847 |
|
|
1871 |
|
|
1872 |
|
private static long fieldOffset(String fieldName) |
1873 |
|
throws NoSuchFieldException { |
1874 |
< |
return _unsafe.objectFieldOffset |
1874 |
> |
return UNSAFE.objectFieldOffset |
1875 |
|
(ForkJoinPool.class.getDeclaredField(fieldName)); |
1876 |
|
} |
1877 |
|
|
1878 |
< |
static final Unsafe _unsafe; |
1878 |
> |
static final Unsafe UNSAFE; |
1879 |
|
static final long eventCountOffset; |
1880 |
|
static final long workerCountsOffset; |
1881 |
|
static final long runControlOffset; |
1884 |
|
|
1885 |
|
static { |
1886 |
|
try { |
1887 |
< |
_unsafe = getUnsafe(); |
1887 |
> |
UNSAFE = getUnsafe(); |
1888 |
|
eventCountOffset = fieldOffset("eventCount"); |
1889 |
|
workerCountsOffset = fieldOffset("workerCounts"); |
1890 |
|
runControlOffset = fieldOffset("runControl"); |
1896 |
|
} |
1897 |
|
|
1898 |
|
private boolean casEventCount(long cmp, long val) { |
1899 |
< |
return _unsafe.compareAndSwapLong(this, eventCountOffset, cmp, val); |
1899 |
> |
return UNSAFE.compareAndSwapLong(this, eventCountOffset, cmp, val); |
1900 |
|
} |
1901 |
|
private boolean casWorkerCounts(int cmp, int val) { |
1902 |
< |
return _unsafe.compareAndSwapInt(this, workerCountsOffset, cmp, val); |
1902 |
> |
return UNSAFE.compareAndSwapInt(this, workerCountsOffset, cmp, val); |
1903 |
|
} |
1904 |
|
private boolean casRunControl(int cmp, int val) { |
1905 |
< |
return _unsafe.compareAndSwapInt(this, runControlOffset, cmp, val); |
1905 |
> |
return UNSAFE.compareAndSwapInt(this, runControlOffset, cmp, val); |
1906 |
|
} |
1907 |
|
private boolean casSpareStack(WaitQueueNode cmp, WaitQueueNode val) { |
1908 |
< |
return _unsafe.compareAndSwapObject(this, spareStackOffset, cmp, val); |
1908 |
> |
return UNSAFE.compareAndSwapObject(this, spareStackOffset, cmp, val); |
1909 |
|
} |
1910 |
|
private boolean casBarrierStack(WaitQueueNode cmp, WaitQueueNode val) { |
1911 |
< |
return _unsafe.compareAndSwapObject(this, syncStackOffset, cmp, val); |
1911 |
> |
return UNSAFE.compareAndSwapObject(this, syncStackOffset, cmp, val); |
1912 |
|
} |
1913 |
|
} |