71 |
|
* encountering the exception; minimally only the latter. |
72 |
|
* |
73 |
|
* <p>It is possible to define and use ForkJoinTasks that may block, |
74 |
< |
* but doing do requires three further considerations: (1) Completion |
74 |
> |
* but doing so requires three further considerations: (1) Completion |
75 |
|
* of few if any <em>other</em> tasks should be dependent on a task |
76 |
|
* that blocks on external synchronization or I/O. Event-style async |
77 |
|
* tasks that are never joined (for example, those subclassing {@link |
395 |
|
final Throwable ex; |
396 |
|
ExceptionNode next; |
397 |
|
final long thrower; // use id not ref to avoid weak cycles |
398 |
+ |
final int hashCode; // store task hashCode before weak ref disappears |
399 |
|
ExceptionNode(ForkJoinTask<?> task, Throwable ex, ExceptionNode next) { |
400 |
|
super(task, exceptionTableRefQueue); |
401 |
|
this.ex = ex; |
402 |
|
this.next = next; |
403 |
|
this.thrower = Thread.currentThread().getId(); |
404 |
+ |
this.hashCode = System.identityHashCode(task); |
405 |
|
} |
406 |
|
} |
407 |
|
|
470 |
|
} |
471 |
|
|
472 |
|
/** |
473 |
< |
* Removes exception node and clears status |
473 |
> |
* Removes exception node and clears status. |
474 |
|
*/ |
475 |
|
private void clearExceptionalCompletion() { |
476 |
|
int h = System.identityHashCode(this); |
563 |
|
private static void expungeStaleExceptions() { |
564 |
|
for (Object x; (x = exceptionTableRefQueue.poll()) != null;) { |
565 |
|
if (x instanceof ExceptionNode) { |
566 |
< |
ForkJoinTask<?> key = ((ExceptionNode)x).get(); |
566 |
> |
int hashCode = ((ExceptionNode)x).hashCode; |
567 |
|
ExceptionNode[] t = exceptionTable; |
568 |
< |
int i = System.identityHashCode(key) & (t.length - 1); |
568 |
> |
int i = hashCode & (t.length - 1); |
569 |
|
ExceptionNode e = t[i]; |
570 |
|
ExceptionNode pred = null; |
571 |
|
while (e != null) { |
608 |
|
throw (Error)ex; |
609 |
|
if (ex instanceof RuntimeException) |
610 |
|
throw (RuntimeException)ex; |
611 |
< |
throw uncheckedThrowable(ex, RuntimeException.class); |
611 |
> |
ForkJoinTask.<RuntimeException>uncheckedThrow(ex); |
612 |
|
} |
613 |
|
} |
614 |
|
|
618 |
|
* unchecked exceptions |
619 |
|
*/ |
620 |
|
@SuppressWarnings("unchecked") static <T extends Throwable> |
621 |
< |
T uncheckedThrowable(final Throwable t, final Class<T> c) { |
622 |
< |
return (T)t; // rely on vacuous cast |
621 |
> |
void uncheckedThrow(Throwable t) throws T { |
622 |
> |
if (t != null) |
623 |
> |
throw (T)t; // rely on vacuous cast |
624 |
|
} |
625 |
|
|
626 |
|
/** |
655 |
|
if ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) |
656 |
|
((ForkJoinWorkerThread)t).workQueue.push(this); |
657 |
|
else |
658 |
< |
ForkJoinPool.commonPool.externalPush(this); |
658 |
> |
ForkJoinPool.common.externalPush(this); |
659 |
|
return this; |
660 |
|
} |
661 |
|
|
1067 |
|
|
1068 |
|
/** |
1069 |
|
* Possibly executes tasks until the pool hosting the current task |
1070 |
< |
* {@link ForkJoinPool#isQuiescent is quiescent}. This method may |
1071 |
< |
* be of use in designs in which many tasks are forked, but none |
1072 |
< |
* are explicitly joined, instead executing them until all are |
1073 |
< |
* processed. |
1070 |
> |
* {@linkplain ForkJoinPool#isQuiescent is quiescent}. This |
1071 |
> |
* method may be of use in designs in which many tasks are forked, |
1072 |
> |
* but none are explicitly joined, instead executing them until |
1073 |
> |
* all are processed. |
1074 |
|
*/ |
1075 |
|
public static void helpQuiesce() { |
1076 |
|
Thread t; |
1079 |
|
wt.pool.helpQuiescePool(wt.workQueue); |
1080 |
|
} |
1081 |
|
else |
1082 |
< |
ForkJoinPool.externalHelpQuiescePool(); |
1082 |
> |
ForkJoinPool.quiesceCommonPool(); |
1083 |
|
} |
1084 |
|
|
1085 |
|
/** |
1328 |
|
} |
1329 |
|
|
1330 |
|
/** |
1331 |
< |
* Adaptor for Runnables. This implements RunnableFuture |
1331 |
> |
* Adapter for Runnables. This implements RunnableFuture |
1332 |
|
* to be compliant with AbstractExecutorService constraints |
1333 |
|
* when used in ForkJoinPool. |
1334 |
|
*/ |
1349 |
|
} |
1350 |
|
|
1351 |
|
/** |
1352 |
< |
* Adaptor for Runnables without results |
1352 |
> |
* Adapter for Runnables without results |
1353 |
|
*/ |
1354 |
|
static final class AdaptedRunnableAction extends ForkJoinTask<Void> |
1355 |
|
implements RunnableFuture<Void> { |
1366 |
|
} |
1367 |
|
|
1368 |
|
/** |
1369 |
< |
* Adaptor for Callables |
1369 |
> |
* Adapter for Callables |
1370 |
|
*/ |
1371 |
|
static final class AdaptedCallable<T> extends ForkJoinTask<T> |
1372 |
|
implements RunnableFuture<T> { |
1487 |
|
private static sun.misc.Unsafe getUnsafe() { |
1488 |
|
try { |
1489 |
|
return sun.misc.Unsafe.getUnsafe(); |
1490 |
< |
} catch (SecurityException se) { |
1491 |
< |
try { |
1492 |
< |
return java.security.AccessController.doPrivileged |
1493 |
< |
(new java.security |
1494 |
< |
.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
1495 |
< |
public sun.misc.Unsafe run() throws Exception { |
1496 |
< |
java.lang.reflect.Field f = sun.misc |
1497 |
< |
.Unsafe.class.getDeclaredField("theUnsafe"); |
1498 |
< |
f.setAccessible(true); |
1499 |
< |
return (sun.misc.Unsafe) f.get(null); |
1500 |
< |
}}); |
1501 |
< |
} catch (java.security.PrivilegedActionException e) { |
1502 |
< |
throw new RuntimeException("Could not initialize intrinsics", |
1503 |
< |
e.getCause()); |
1504 |
< |
} |
1490 |
> |
} catch (SecurityException tryReflectionInstead) {} |
1491 |
> |
try { |
1492 |
> |
return java.security.AccessController.doPrivileged |
1493 |
> |
(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
1494 |
> |
public sun.misc.Unsafe run() throws Exception { |
1495 |
> |
Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class; |
1496 |
> |
for (java.lang.reflect.Field f : k.getDeclaredFields()) { |
1497 |
> |
f.setAccessible(true); |
1498 |
> |
Object x = f.get(null); |
1499 |
> |
if (k.isInstance(x)) |
1500 |
> |
return k.cast(x); |
1501 |
> |
} |
1502 |
> |
throw new NoSuchFieldError("the Unsafe"); |
1503 |
> |
}}); |
1504 |
> |
} catch (java.security.PrivilegedActionException e) { |
1505 |
> |
throw new RuntimeException("Could not initialize intrinsics", |
1506 |
> |
e.getCause()); |
1507 |
|
} |
1508 |
|
} |
1509 |
|
} |