| 5 |
|
*/ |
| 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.*; |
| 10 |
> |
|
| 11 |
> |
import java.util.Collection; |
| 12 |
|
|
| 13 |
|
/** |
| 14 |
|
* A thread managed by a {@link ForkJoinPool}. This class is |
| 731 |
|
do {} while (!tryActivate()); // re-activate on exit |
| 732 |
|
} |
| 733 |
|
|
| 734 |
< |
// Unsafe mechanics for jsr166y 3rd party package. |
| 734 |
> |
// Unsafe mechanics |
| 735 |
> |
|
| 736 |
> |
private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
| 737 |
> |
private static final long spOffset = |
| 738 |
> |
objectFieldOffset("sp", ForkJoinWorkerThread.class); |
| 739 |
> |
private static final long runStateOffset = |
| 740 |
> |
objectFieldOffset("runState", ForkJoinWorkerThread.class); |
| 741 |
> |
private static final long qBase; |
| 742 |
> |
private static final int qShift; |
| 743 |
> |
|
| 744 |
> |
static { |
| 745 |
> |
qBase = UNSAFE.arrayBaseOffset(ForkJoinTask[].class); |
| 746 |
> |
int s = UNSAFE.arrayIndexScale(ForkJoinTask[].class); |
| 747 |
> |
if ((s & (s-1)) != 0) |
| 748 |
> |
throw new Error("data type scale not a power of two"); |
| 749 |
> |
qShift = 31 - Integer.numberOfLeadingZeros(s); |
| 750 |
> |
} |
| 751 |
> |
|
| 752 |
> |
private static long objectFieldOffset(String field, Class<?> klazz) { |
| 753 |
> |
try { |
| 754 |
> |
return UNSAFE.objectFieldOffset(klazz.getDeclaredField(field)); |
| 755 |
> |
} catch (NoSuchFieldException e) { |
| 756 |
> |
// Convert Exception to corresponding Error |
| 757 |
> |
NoSuchFieldError error = new NoSuchFieldError(field); |
| 758 |
> |
error.initCause(e); |
| 759 |
> |
throw error; |
| 760 |
> |
} |
| 761 |
> |
} |
| 762 |
> |
|
| 763 |
> |
/** |
| 764 |
> |
* Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. |
| 765 |
> |
* Replace with a simple call to Unsafe.getUnsafe when integrating |
| 766 |
> |
* into a jdk. |
| 767 |
> |
* |
| 768 |
> |
* @return a sun.misc.Unsafe |
| 769 |
> |
*/ |
| 770 |
|
private static sun.misc.Unsafe getUnsafe() { |
| 771 |
|
try { |
| 772 |
|
return sun.misc.Unsafe.getUnsafe(); |
| 773 |
|
} catch (SecurityException se) { |
| 774 |
|
try { |
| 775 |
|
return java.security.AccessController.doPrivileged |
| 776 |
< |
(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 776 |
> |
(new java.security |
| 777 |
> |
.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 778 |
|
public sun.misc.Unsafe run() throws Exception { |
| 779 |
< |
return getUnsafeByReflection(); |
| 779 |
> |
java.lang.reflect.Field f = sun.misc |
| 780 |
> |
.Unsafe.class.getDeclaredField("theUnsafe"); |
| 781 |
> |
f.setAccessible(true); |
| 782 |
> |
return (sun.misc.Unsafe) f.get(null); |
| 783 |
|
}}); |
| 784 |
|
} catch (java.security.PrivilegedActionException e) { |
| 785 |
|
throw new RuntimeException("Could not initialize intrinsics", |
| 787 |
|
} |
| 788 |
|
} |
| 789 |
|
} |
| 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 |
– |
} |
| 790 |
|
} |
