| 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.*; |
| 12 |
|
|
| 13 |
|
/** |
| 14 |
|
* A thread managed by a {@link ForkJoinPool}. This class is |
| 731 |
|
do {} while (!tryActivate()); // re-activate on exit |
| 732 |
|
} |
| 733 |
|
|
| 734 |
< |
// Temporary Unsafe mechanics for preliminary release |
| 735 |
< |
private static Unsafe getUnsafe() throws Throwable { |
| 734 |
> |
// Unsafe mechanics for jsr166y 3rd party package. |
| 735 |
> |
private static sun.misc.Unsafe getUnsafe() { |
| 736 |
|
try { |
| 737 |
< |
return Unsafe.getUnsafe(); |
| 737 |
> |
return sun.misc.Unsafe.getUnsafe(); |
| 738 |
|
} catch (SecurityException se) { |
| 739 |
|
try { |
| 740 |
|
return java.security.AccessController.doPrivileged |
| 741 |
< |
(new java.security.PrivilegedExceptionAction<Unsafe>() { |
| 742 |
< |
public Unsafe run() throws Exception { |
| 743 |
< |
return getUnsafePrivileged(); |
| 741 |
> |
(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 742 |
> |
public sun.misc.Unsafe run() throws Exception { |
| 743 |
> |
return getUnsafeByReflection(); |
| 744 |
|
}}); |
| 745 |
|
} catch (java.security.PrivilegedActionException e) { |
| 746 |
< |
throw e.getCause(); |
| 746 |
> |
throw new RuntimeException("Could not initialize intrinsics", |
| 747 |
> |
e.getCause()); |
| 748 |
|
} |
| 749 |
|
} |
| 750 |
|
} |
| 751 |
|
|
| 752 |
< |
private static Unsafe getUnsafePrivileged() |
| 752 |
> |
private static sun.misc.Unsafe getUnsafeByReflection() |
| 753 |
|
throws NoSuchFieldException, IllegalAccessException { |
| 754 |
< |
Field f = Unsafe.class.getDeclaredField("theUnsafe"); |
| 754 |
> |
java.lang.reflect.Field f = |
| 755 |
> |
sun.misc.Unsafe.class.getDeclaredField("theUnsafe"); |
| 756 |
|
f.setAccessible(true); |
| 757 |
< |
return (Unsafe) f.get(null); |
| 757 |
> |
return (sun.misc.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)); |
| 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 |
< |
static final Unsafe UNSAFE; |
| 772 |
< |
static final long baseOffset; |
| 773 |
< |
static final long spOffset; |
| 774 |
< |
static final long runStateOffset; |
| 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 |
< |
try { |
| 783 |
< |
UNSAFE = getUnsafe(); |
| 784 |
< |
baseOffset = fieldOffset("base"); |
| 785 |
< |
spOffset = fieldOffset("sp"); |
| 786 |
< |
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 |
< |
} |
| 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 |
|
} |
| 788 |
|
} |
