| 55 |
|
* minimize other blocking synchronization apart from joining other |
| 56 |
|
* tasks or using synchronizers such as Phasers that are advertised to |
| 57 |
|
* cooperate with fork/join scheduling. Subdividable tasks should also |
| 58 |
< |
* not perform blocking IO, and should ideally access variables that |
| 58 |
> |
* not perform blocking I/O, and should ideally access variables that |
| 59 |
|
* are completely independent of those accessed by other running |
| 60 |
|
* tasks. These guidelines are loosely enforced by not permitting |
| 61 |
|
* checked exceptions such as {@code IOExceptions} to be |
| 73 |
|
* <p>It is possible to define and use ForkJoinTasks that may block, |
| 74 |
|
* but doing do 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 IO. Event-style async |
| 76 |
> |
* that blocks on external synchronization or I/O. Event-style async |
| 77 |
|
* tasks that are never joined (for example, those subclassing {@link |
| 78 |
|
* CountedCompleter}) often fall into this category. (2) To minimize |
| 79 |
|
* resource impact, tasks should be small; ideally performing only the |
| 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 |
|
|
| 437 |
|
} |
| 438 |
|
|
| 439 |
|
/** |
| 440 |
< |
* Records exception and possibly propagates |
| 440 |
> |
* Records exception and possibly propagates. |
| 441 |
|
* |
| 442 |
|
* @return status on exit |
| 443 |
|
*/ |
| 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 |
|
|
| 981 |
|
if (Thread.interrupted()) |
| 982 |
|
throw new InterruptedException(); |
| 983 |
|
// Messy in part because we measure in nanosecs, but wait in millisecs |
| 984 |
< |
int s; long ns, ms; |
| 985 |
< |
if ((s = status) >= 0 && (ns = unit.toNanos(timeout)) > 0L) { |
| 984 |
> |
int s; long ms; |
| 985 |
> |
long ns = unit.toNanos(timeout); |
| 986 |
> |
if ((s = status) >= 0 && ns > 0L) { |
| 987 |
|
long deadline = System.nanoTime() + ns; |
| 988 |
|
ForkJoinPool p = null; |
| 989 |
|
ForkJoinPool.WorkQueue w = null; |
| 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 |
|
} |
