| 134 |
|
* (DAG). Otherwise, executions may encounter a form of deadlock as |
| 135 |
|
* tasks cyclically wait for each other. However, this framework |
| 136 |
|
* supports other methods and techniques (for example the use of |
| 137 |
< |
* {@link java.util.concurrent.Phaser}, {@link #helpQuiesce}, and |
| 138 |
< |
* {@link #complete}) that |
| 137 |
> |
* {@link Phaser}, {@link #helpQuiesce}, and {@link #complete}) that |
| 138 |
|
* may be of use in constructing custom subclasses for problems that |
| 139 |
< |
* are not statically structured as DAGs. To support such usages a |
| 139 |
> |
* are not statically structured as DAGs. To support such usages, a |
| 140 |
|
* ForkJoinTask may be atomically <em>tagged</em> with a {@code short} |
| 141 |
|
* value using {@link #setForkJoinTaskTag} or {@link |
| 142 |
|
* #compareAndSetForkJoinTaskTag} and checked using {@link |
| 285 |
|
*/ |
| 286 |
|
private int externalAwaitDone() { |
| 287 |
|
int s; |
| 288 |
< |
ForkJoinPool.externalHelpJoin(this); |
| 289 |
< |
boolean interrupted = false; |
| 290 |
< |
while ((s = status) >= 0) { |
| 291 |
< |
if (U.compareAndSwapInt(this, STATUS, s, s | SIGNAL)) { |
| 292 |
< |
synchronized (this) { |
| 293 |
< |
if (status >= 0) { |
| 294 |
< |
try { |
| 295 |
< |
wait(); |
| 296 |
< |
} catch (InterruptedException ie) { |
| 297 |
< |
interrupted = true; |
| 288 |
> |
ForkJoinPool cp = ForkJoinPool.common; |
| 289 |
> |
if ((s = status) >= 0) { |
| 290 |
> |
if (cp != null) { |
| 291 |
> |
if (this instanceof CountedCompleter) |
| 292 |
> |
s = cp.externalHelpComplete((CountedCompleter<?>)this); |
| 293 |
> |
else if (cp.tryExternalUnpush(this)) |
| 294 |
> |
s = doExec(); |
| 295 |
> |
} |
| 296 |
> |
if (s >= 0 && (s = status) >= 0) { |
| 297 |
> |
boolean interrupted = false; |
| 298 |
> |
do { |
| 299 |
> |
if (U.compareAndSwapInt(this, STATUS, s, s | SIGNAL)) { |
| 300 |
> |
synchronized (this) { |
| 301 |
> |
if (status >= 0) { |
| 302 |
> |
try { |
| 303 |
> |
wait(); |
| 304 |
> |
} catch (InterruptedException ie) { |
| 305 |
> |
interrupted = true; |
| 306 |
> |
} |
| 307 |
> |
} |
| 308 |
> |
else |
| 309 |
> |
notifyAll(); |
| 310 |
|
} |
| 311 |
|
} |
| 312 |
< |
else |
| 313 |
< |
notifyAll(); |
| 314 |
< |
} |
| 312 |
> |
} while ((s = status) >= 0); |
| 313 |
> |
if (interrupted) |
| 314 |
> |
Thread.currentThread().interrupt(); |
| 315 |
|
} |
| 316 |
|
} |
| 306 |
– |
if (interrupted) |
| 307 |
– |
Thread.currentThread().interrupt(); |
| 317 |
|
return s; |
| 318 |
|
} |
| 319 |
|
|
| 322 |
|
*/ |
| 323 |
|
private int externalInterruptibleAwaitDone() throws InterruptedException { |
| 324 |
|
int s; |
| 325 |
+ |
ForkJoinPool cp = ForkJoinPool.common; |
| 326 |
|
if (Thread.interrupted()) |
| 327 |
|
throw new InterruptedException(); |
| 328 |
< |
ForkJoinPool.externalHelpJoin(this); |
| 328 |
> |
if ((s = status) >= 0 && cp != null) { |
| 329 |
> |
if (this instanceof CountedCompleter) |
| 330 |
> |
cp.externalHelpComplete((CountedCompleter<?>)this); |
| 331 |
> |
else if (cp.tryExternalUnpush(this)) |
| 332 |
> |
doExec(); |
| 333 |
> |
} |
| 334 |
|
while ((s = status) >= 0) { |
| 335 |
|
if (U.compareAndSwapInt(this, STATUS, s, s | SIGNAL)) { |
| 336 |
|
synchronized (this) { |
| 616 |
|
/** |
| 617 |
|
* A version of "sneaky throw" to relay exceptions |
| 618 |
|
*/ |
| 619 |
< |
static void rethrow(final Throwable ex) { |
| 620 |
< |
if (ex != null) { |
| 606 |
< |
if (ex instanceof Error) |
| 607 |
< |
throw (Error)ex; |
| 608 |
< |
if (ex instanceof RuntimeException) |
| 609 |
< |
throw (RuntimeException)ex; |
| 619 |
> |
static void rethrow(Throwable ex) { |
| 620 |
> |
if (ex != null) |
| 621 |
|
ForkJoinTask.<RuntimeException>uncheckedThrow(ex); |
| 611 |
– |
} |
| 622 |
|
} |
| 623 |
|
|
| 624 |
|
/** |
| 628 |
|
*/ |
| 629 |
|
@SuppressWarnings("unchecked") static <T extends Throwable> |
| 630 |
|
void uncheckedThrow(Throwable t) throws T { |
| 631 |
< |
if (t != null) |
| 622 |
< |
throw (T)t; // rely on vacuous cast |
| 631 |
> |
throw (T)t; // rely on vacuous cast |
| 632 |
|
} |
| 633 |
|
|
| 634 |
|
/** |
| 839 |
|
* <p>This method is designed to be invoked by <em>other</em> |
| 840 |
|
* tasks. To terminate the current task, you can just return or |
| 841 |
|
* throw an unchecked exception from its computation method, or |
| 842 |
< |
* invoke {@link #completeExceptionally}. |
| 842 |
> |
* invoke {@link #completeExceptionally(Throwable)}. |
| 843 |
|
* |
| 844 |
|
* @param mayInterruptIfRunning this value has no effect in the |
| 845 |
|
* default implementation because interrupts are not used to |
| 991 |
|
// Messy in part because we measure in nanosecs, but wait in millisecs |
| 992 |
|
int s; long ms; |
| 993 |
|
long ns = unit.toNanos(timeout); |
| 994 |
+ |
ForkJoinPool cp; |
| 995 |
|
if ((s = status) >= 0 && ns > 0L) { |
| 996 |
|
long deadline = System.nanoTime() + ns; |
| 997 |
|
ForkJoinPool p = null; |
| 1003 |
|
w = wt.workQueue; |
| 1004 |
|
p.helpJoinOnce(w, this); // no retries on failure |
| 1005 |
|
} |
| 1006 |
< |
else |
| 1007 |
< |
ForkJoinPool.externalHelpJoin(this); |
| 1006 |
> |
else if ((cp = ForkJoinPool.common) != null) { |
| 1007 |
> |
if (this instanceof CountedCompleter) |
| 1008 |
> |
cp.externalHelpComplete((CountedCompleter<?>)this); |
| 1009 |
> |
else if (cp.tryExternalUnpush(this)) |
| 1010 |
> |
doExec(); |
| 1011 |
> |
} |
| 1012 |
|
boolean canBlock = false; |
| 1013 |
|
boolean interrupted = false; |
| 1014 |
|
try { |
| 1016 |
|
if (w != null && w.qlock < 0) |
| 1017 |
|
cancelIgnoringExceptions(this); |
| 1018 |
|
else if (!canBlock) { |
| 1019 |
< |
if (p == null || p.tryCompensate()) |
| 1019 |
> |
if (p == null || p.tryCompensate(p.ctl)) |
| 1020 |
|
canBlock = true; |
| 1021 |
|
} |
| 1022 |
|
else { |
| 1157 |
|
Thread t; |
| 1158 |
|
return (((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ? |
| 1159 |
|
((ForkJoinWorkerThread)t).workQueue.tryUnpush(this) : |
| 1160 |
< |
ForkJoinPool.tryExternalUnpush(this)); |
| 1160 |
> |
ForkJoinPool.common.tryExternalUnpush(this)); |
| 1161 |
|
} |
| 1162 |
|
|
| 1163 |
|
/** |
| 1326 |
|
* |
| 1327 |
|
* @param e the expected tag value |
| 1328 |
|
* @param tag the new tag value |
| 1329 |
< |
* @return true if successful; i.e., the current value was |
| 1329 |
> |
* @return {@code true} if successful; i.e., the current value was |
| 1330 |
|
* equal to e and is now tag. |
| 1331 |
|
* @since 1.8 |
| 1332 |
|
*/ |
| 1378 |
|
private static final long serialVersionUID = 5232453952276885070L; |
| 1379 |
|
} |
| 1380 |
|
|
| 1381 |
+ |
/** |
| 1382 |
+ |
* Adaptor for Runnables in which failure forces worker exception |
| 1383 |
+ |
*/ |
| 1384 |
+ |
static final class RunnableExecuteAction extends ForkJoinTask<Void> { |
| 1385 |
+ |
final Runnable runnable; |
| 1386 |
+ |
RunnableExecuteAction(Runnable runnable) { |
| 1387 |
+ |
if (runnable == null) throw new NullPointerException(); |
| 1388 |
+ |
this.runnable = runnable; |
| 1389 |
+ |
} |
| 1390 |
+ |
public final Void getRawResult() { return null; } |
| 1391 |
+ |
public final void setRawResult(Void v) { } |
| 1392 |
+ |
public final boolean exec() { runnable.run(); return true; } |
| 1393 |
+ |
void internalPropagateException(Throwable ex) { |
| 1394 |
+ |
rethrow(ex); // rethrow outside exec() catches. |
| 1395 |
+ |
} |
| 1396 |
+ |
private static final long serialVersionUID = 5232453952276885070L; |
| 1397 |
+ |
} |
| 1398 |
+ |
|
| 1399 |
|
/** |
| 1400 |
|
* Adaptor for Callables |
| 1401 |
|
*/ |
