| 5 |
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*/ |
| 6 |
|
|
| 7 |
|
package jsr166y; |
| 8 |
< |
import java.util.*; |
| 8 |
> |
|
| 9 |
|
import java.util.concurrent.*; |
| 10 |
< |
import java.util.concurrent.atomic.*; |
| 11 |
< |
import java.util.concurrent.locks.*; |
| 12 |
< |
import sun.misc.Unsafe; |
| 13 |
< |
import java.lang.reflect.*; |
| 10 |
> |
|
| 11 |
> |
import java.util.Collection; |
| 12 |
|
|
| 13 |
|
/** |
| 14 |
|
* A thread managed by a {@link ForkJoinPool}. This class is |
| 265 |
|
final boolean shutdownNow() { return transitionRunStateTo(TERMINATING); } |
| 266 |
|
|
| 267 |
|
/** |
| 268 |
< |
* 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 |
> |
* |
| 270 |
> |
* @return {@code true} if not already at least at given state |
| 271 |
|
*/ |
| 272 |
|
private boolean transitionRunStateTo(int state) { |
| 273 |
|
for (;;) { |
| 373 |
|
* {@code super.onTermination} at the end of the overridden method. |
| 374 |
|
* |
| 375 |
|
* @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 |
|
*/ |
| 378 |
|
protected void onTermination(Throwable exception) { |
| 379 |
|
// Execute remaining local tasks unless aborting or terminating |
| 668 |
|
} |
| 669 |
|
|
| 670 |
|
/** |
| 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 |
|
* |
| 674 |
|
* @param ws array of workers |
| 675 |
|
*/ |
| 732 |
|
do {} while (!tryActivate()); // re-activate on exit |
| 733 |
|
} |
| 734 |
|
|
| 735 |
< |
// Temporary Unsafe mechanics for preliminary release |
| 736 |
< |
private static Unsafe getUnsafe() throws Throwable { |
| 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 Unsafe.getUnsafe(); |
| 773 |
> |
return sun.misc.Unsafe.getUnsafe(); |
| 774 |
|
} catch (SecurityException se) { |
| 775 |
|
try { |
| 776 |
|
return java.security.AccessController.doPrivileged |
| 777 |
< |
(new java.security.PrivilegedExceptionAction<Unsafe>() { |
| 778 |
< |
public Unsafe run() throws Exception { |
| 779 |
< |
return getUnsafePrivileged(); |
| 777 |
> |
(new java.security |
| 778 |
> |
.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 779 |
> |
public sun.misc.Unsafe run() throws Exception { |
| 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 e.getCause(); |
| 786 |
> |
throw new RuntimeException("Could not initialize intrinsics", |
| 787 |
> |
e.getCause()); |
| 788 |
|
} |
| 789 |
|
} |
| 790 |
|
} |
| 752 |
– |
|
| 753 |
– |
private static Unsafe getUnsafePrivileged() |
| 754 |
– |
throws NoSuchFieldException, IllegalAccessException { |
| 755 |
– |
Field f = Unsafe.class.getDeclaredField("theUnsafe"); |
| 756 |
– |
f.setAccessible(true); |
| 757 |
– |
return (Unsafe) f.get(null); |
| 758 |
– |
} |
| 759 |
– |
|
| 760 |
– |
private static long fieldOffset(String fieldName) |
| 761 |
– |
throws NoSuchFieldException { |
| 762 |
– |
return UNSAFE.objectFieldOffset |
| 763 |
– |
(ForkJoinWorkerThread.class.getDeclaredField(fieldName)); |
| 764 |
– |
} |
| 765 |
– |
|
| 766 |
– |
static final Unsafe UNSAFE; |
| 767 |
– |
static final long baseOffset; |
| 768 |
– |
static final long spOffset; |
| 769 |
– |
static final long runStateOffset; |
| 770 |
– |
static final long qBase; |
| 771 |
– |
static final int qShift; |
| 772 |
– |
static { |
| 773 |
– |
try { |
| 774 |
– |
UNSAFE = getUnsafe(); |
| 775 |
– |
baseOffset = fieldOffset("base"); |
| 776 |
– |
spOffset = fieldOffset("sp"); |
| 777 |
– |
runStateOffset = fieldOffset("runState"); |
| 778 |
– |
qBase = UNSAFE.arrayBaseOffset(ForkJoinTask[].class); |
| 779 |
– |
int s = UNSAFE.arrayIndexScale(ForkJoinTask[].class); |
| 780 |
– |
if ((s & (s-1)) != 0) |
| 781 |
– |
throw new Error("data type scale not a power of two"); |
| 782 |
– |
qShift = 31 - Integer.numberOfLeadingZeros(s); |
| 783 |
– |
} catch (Throwable e) { |
| 784 |
– |
throw new RuntimeException("Could not initialize intrinsics", e); |
| 785 |
– |
} |
| 786 |
– |
} |
| 791 |
|
} |
