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This commit is contained in:
Jesper Wilhelmsson 2021-01-19 22:49:44 +00:00
commit cf25383d19
2 changed files with 62 additions and 59 deletions
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76
src/java.base/share/classes/java/util/concurrent/CompletableFuture.java
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@ -1915,45 +1915,49 @@ public class CompletableFuture<T> implements Future<T>, CompletionStage<T> {
* throws TimeoutException on timeout.
*/
private Object timedGet(long nanos) throws TimeoutException {
if (Thread.interrupted())
return null;
if (nanos > 0L) {
long d = System.nanoTime() + nanos;
long deadline = (d == 0L) ? 1L : d; // avoid 0
Signaller q = null;
boolean queued = false;
Object r;
while ((r = result) == null) { // similar to untimed
if (q == null) {
q = new Signaller(true, nanos, deadline);
if (Thread.currentThread() instanceof ForkJoinWorkerThread)
ForkJoinPool.helpAsyncBlocker(defaultExecutor(), q);
}
else if (!queued)
queued = tryPushStack(q);
else if (q.nanos <= 0L)
break;
else {
try {
ForkJoinPool.managedBlock(q);
} catch (InterruptedException ie) {
q.interrupted = true;
}
if (q.interrupted)
break;
long d = System.nanoTime() + nanos;
long deadline = (d == 0L) ? 1L : d; // avoid 0
boolean interrupted = false, queued = false;
Signaller q = null;
Object r = null;
for (;;) { // order of checking interrupt, result, timeout matters
if (interrupted || (interrupted = Thread.interrupted()))
break;
else if ((r = result) != null)
break;
else if (nanos <= 0L)
break;
else if (q == null) {
q = new Signaller(true, nanos, deadline);
if (Thread.currentThread() instanceof ForkJoinWorkerThread)
ForkJoinPool.helpAsyncBlocker(defaultExecutor(), q);
}
else if (!queued)
queued = tryPushStack(q);
else {
try {
ForkJoinPool.managedBlock(q);
interrupted = q.interrupted;
nanos = q.nanos;
} catch (InterruptedException ie) {
interrupted = true;
}
}
if (q != null && queued) {
q.thread = null;
if (r == null)
cleanStack();
}
if (r != null || (r = result) != null)
postComplete();
if (r != null || (q != null && q.interrupted))
return r;
}
throw new TimeoutException();
if (q != null) {
q.thread = null;
if (r == null)
cleanStack();
}
if (r != null) {
if (interrupted)
Thread.currentThread().interrupt();
postComplete();
return r;
} else if (interrupted)
return null;
else
throw new TimeoutException();
}
/* ------------- public methods -------------- */