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*/ |
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package jsr166y; |
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< |
import java.util.*; |
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|
9 |
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import java.util.concurrent.*; |
10 |
< |
import java.util.concurrent.atomic.*; |
11 |
< |
import java.util.concurrent.locks.*; |
10 |
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|
11 |
> |
import java.util.Collection; |
12 |
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|
13 |
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/** |
14 |
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* A thread managed by a {@link ForkJoinPool}. This class is |
265 |
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final boolean shutdownNow() { return transitionRunStateTo(TERMINATING); } |
266 |
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|
267 |
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/** |
268 |
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* Transitions to at least the given state. Returns true if not |
269 |
< |
* already at least at given state. |
268 |
> |
* Transitions to at least the given state. |
269 |
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* |
270 |
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* @return {@code true} if not already at least at given state |
271 |
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*/ |
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private boolean transitionRunStateTo(int state) { |
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for (;;) { |
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* {@code super.onTermination} at the end of the overridden method. |
374 |
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* |
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* @param exception the exception causing this thread to abort due |
376 |
< |
* to an unrecoverable error, or null if completed normally |
376 |
> |
* to an unrecoverable error, or {@code null} if completed normally |
377 |
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*/ |
378 |
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protected void onTermination(Throwable exception) { |
379 |
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// Execute remaining local tasks unless aborting or terminating |
647 |
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* |
648 |
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* @return the number of tasks drained |
649 |
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*/ |
650 |
< |
final int drainTasksTo(Collection<ForkJoinTask<?>> c) { |
650 |
> |
final int drainTasksTo(Collection<? super ForkJoinTask<?>> c) { |
651 |
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int n = 0; |
652 |
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ForkJoinTask<?> t; |
653 |
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while (base != sp && (t = deqTask()) != null) { |
668 |
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} |
669 |
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|
670 |
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/** |
671 |
< |
* Returns true if at least one worker in the given array appears |
672 |
< |
* to have at least one queued task. |
671 |
> |
* Returns {@code true} if at least one worker in the given array |
672 |
> |
* appears to have at least one queued task. |
673 |
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* |
674 |
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* @param ws array of workers |
675 |
|
*/ |
732 |
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do {} while (!tryActivate()); // re-activate on exit |
733 |
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} |
734 |
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|
735 |
< |
// Unsafe mechanics for jsr166y 3rd party package. |
735 |
> |
// Unsafe mechanics |
736 |
> |
|
737 |
> |
private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
738 |
> |
private static final long spOffset = |
739 |
> |
objectFieldOffset("sp", ForkJoinWorkerThread.class); |
740 |
> |
private static final long runStateOffset = |
741 |
> |
objectFieldOffset("runState", ForkJoinWorkerThread.class); |
742 |
> |
private static final long qBase; |
743 |
> |
private static final int qShift; |
744 |
> |
|
745 |
> |
static { |
746 |
> |
qBase = UNSAFE.arrayBaseOffset(ForkJoinTask[].class); |
747 |
> |
int s = UNSAFE.arrayIndexScale(ForkJoinTask[].class); |
748 |
> |
if ((s & (s-1)) != 0) |
749 |
> |
throw new Error("data type scale not a power of two"); |
750 |
> |
qShift = 31 - Integer.numberOfLeadingZeros(s); |
751 |
> |
} |
752 |
> |
|
753 |
> |
private static long objectFieldOffset(String field, Class<?> klazz) { |
754 |
> |
try { |
755 |
> |
return UNSAFE.objectFieldOffset(klazz.getDeclaredField(field)); |
756 |
> |
} catch (NoSuchFieldException e) { |
757 |
> |
// Convert Exception to corresponding Error |
758 |
> |
NoSuchFieldError error = new NoSuchFieldError(field); |
759 |
> |
error.initCause(e); |
760 |
> |
throw error; |
761 |
> |
} |
762 |
> |
} |
763 |
> |
|
764 |
> |
/** |
765 |
> |
* Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. |
766 |
> |
* Replace with a simple call to Unsafe.getUnsafe when integrating |
767 |
> |
* into a jdk. |
768 |
> |
* |
769 |
> |
* @return a sun.misc.Unsafe |
770 |
> |
*/ |
771 |
|
private static sun.misc.Unsafe getUnsafe() { |
772 |
|
try { |
773 |
|
return sun.misc.Unsafe.getUnsafe(); |
774 |
|
} catch (SecurityException se) { |
775 |
|
try { |
776 |
|
return java.security.AccessController.doPrivileged |
777 |
< |
(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
777 |
> |
(new java.security |
778 |
> |
.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
779 |
|
public sun.misc.Unsafe run() throws Exception { |
780 |
< |
return getUnsafeByReflection(); |
780 |
> |
java.lang.reflect.Field f = sun.misc |
781 |
> |
.Unsafe.class.getDeclaredField("theUnsafe"); |
782 |
> |
f.setAccessible(true); |
783 |
> |
return (sun.misc.Unsafe) f.get(null); |
784 |
|
}}); |
785 |
|
} catch (java.security.PrivilegedActionException e) { |
786 |
|
throw new RuntimeException("Could not initialize intrinsics", |
788 |
|
} |
789 |
|
} |
790 |
|
} |
751 |
– |
|
752 |
– |
private static sun.misc.Unsafe getUnsafeByReflection() |
753 |
– |
throws NoSuchFieldException, IllegalAccessException { |
754 |
– |
java.lang.reflect.Field f = |
755 |
– |
sun.misc.Unsafe.class.getDeclaredField("theUnsafe"); |
756 |
– |
f.setAccessible(true); |
757 |
– |
return (sun.misc.Unsafe) f.get(null); |
758 |
– |
} |
759 |
– |
|
760 |
– |
private static long fieldOffset(String fieldName, Class<?> klazz) { |
761 |
– |
try { |
762 |
– |
return UNSAFE.objectFieldOffset(klazz.getDeclaredField(fieldName)); |
763 |
– |
} catch (NoSuchFieldException e) { |
764 |
– |
// Convert Exception to Error |
765 |
– |
NoSuchFieldError error = new NoSuchFieldError(fieldName); |
766 |
– |
error.initCause(e); |
767 |
– |
throw error; |
768 |
– |
} |
769 |
– |
} |
770 |
– |
|
771 |
– |
private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
772 |
– |
static final long baseOffset = |
773 |
– |
fieldOffset("base", ForkJoinWorkerThread.class); |
774 |
– |
static final long spOffset = |
775 |
– |
fieldOffset("sp", ForkJoinWorkerThread.class); |
776 |
– |
static final long runStateOffset = |
777 |
– |
fieldOffset("runState", ForkJoinWorkerThread.class); |
778 |
– |
static final long qBase; |
779 |
– |
static final int qShift; |
780 |
– |
|
781 |
– |
static { |
782 |
– |
qBase = UNSAFE.arrayBaseOffset(ForkJoinTask[].class); |
783 |
– |
int s = UNSAFE.arrayIndexScale(ForkJoinTask[].class); |
784 |
– |
if ((s & (s-1)) != 0) |
785 |
– |
throw new Error("data type scale not a power of two"); |
786 |
– |
qShift = 31 - Integer.numberOfLeadingZeros(s); |
787 |
– |
} |
791 |
|
} |