| 799 |
|
new PaddedAtomicReference<Node<E>>(null)); |
| 800 |
|
} |
| 801 |
|
|
| 802 |
< |
// Unsafe mechanics for jsr166y 3rd party package. |
| 802 |
> |
// Unsafe mechanics |
| 803 |
> |
|
| 804 |
> |
private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
| 805 |
> |
private static final long headOffset = |
| 806 |
> |
objectFieldOffset("head", LinkedTransferQueue.class); |
| 807 |
> |
private static final long tailOffset = |
| 808 |
> |
objectFieldOffset("tail", LinkedTransferQueue.class); |
| 809 |
> |
private static final long cleanMeOffset = |
| 810 |
> |
objectFieldOffset("cleanMe", LinkedTransferQueue.class); |
| 811 |
> |
|
| 812 |
> |
private static long objectFieldOffset(String field, Class<?> klazz) { |
| 813 |
> |
try { |
| 814 |
> |
return UNSAFE.objectFieldOffset(klazz.getDeclaredField(field)); |
| 815 |
> |
} catch (NoSuchFieldException e) { |
| 816 |
> |
// Convert Exception to corresponding Error |
| 817 |
> |
NoSuchFieldError error = new NoSuchFieldError(field); |
| 818 |
> |
error.initCause(e); |
| 819 |
> |
throw error; |
| 820 |
> |
} |
| 821 |
> |
} |
| 822 |
> |
|
| 823 |
> |
/** |
| 824 |
> |
* Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. |
| 825 |
> |
* Replace with a simple call to Unsafe.getUnsafe when integrating |
| 826 |
> |
* into a jdk. |
| 827 |
> |
* |
| 828 |
> |
* @return a sun.misc.Unsafe |
| 829 |
> |
*/ |
| 830 |
|
private static sun.misc.Unsafe getUnsafe() { |
| 831 |
|
try { |
| 832 |
|
return sun.misc.Unsafe.getUnsafe(); |
| 833 |
|
} catch (SecurityException se) { |
| 834 |
|
try { |
| 835 |
|
return java.security.AccessController.doPrivileged |
| 836 |
< |
(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 836 |
> |
(new java.security |
| 837 |
> |
.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 838 |
|
public sun.misc.Unsafe run() throws Exception { |
| 839 |
< |
return getUnsafeByReflection(); |
| 839 |
> |
java.lang.reflect.Field f = sun.misc |
| 840 |
> |
.Unsafe.class.getDeclaredField("theUnsafe"); |
| 841 |
> |
f.setAccessible(true); |
| 842 |
> |
return (sun.misc.Unsafe) f.get(null); |
| 843 |
|
}}); |
| 844 |
|
} catch (java.security.PrivilegedActionException e) { |
| 845 |
|
throw new RuntimeException("Could not initialize intrinsics", |
| 847 |
|
} |
| 848 |
|
} |
| 849 |
|
} |
| 819 |
– |
|
| 820 |
– |
private static sun.misc.Unsafe getUnsafeByReflection() |
| 821 |
– |
throws NoSuchFieldException, IllegalAccessException { |
| 822 |
– |
java.lang.reflect.Field f = |
| 823 |
– |
sun.misc.Unsafe.class.getDeclaredField("theUnsafe"); |
| 824 |
– |
f.setAccessible(true); |
| 825 |
– |
return (sun.misc.Unsafe) f.get(null); |
| 826 |
– |
} |
| 827 |
– |
|
| 828 |
– |
private static long fieldOffset(String fieldName, Class<?> klazz) { |
| 829 |
– |
try { |
| 830 |
– |
return UNSAFE.objectFieldOffset(klazz.getDeclaredField(fieldName)); |
| 831 |
– |
} catch (NoSuchFieldException e) { |
| 832 |
– |
// Convert Exception to Error |
| 833 |
– |
NoSuchFieldError error = new NoSuchFieldError(fieldName); |
| 834 |
– |
error.initCause(e); |
| 835 |
– |
throw error; |
| 836 |
– |
} |
| 837 |
– |
} |
| 838 |
– |
|
| 839 |
– |
private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
| 840 |
– |
private static final long headOffset = |
| 841 |
– |
fieldOffset("head", LinkedTransferQueue.class); |
| 842 |
– |
private static final long tailOffset = |
| 843 |
– |
fieldOffset("tail", LinkedTransferQueue.class); |
| 844 |
– |
private static final long cleanMeOffset = |
| 845 |
– |
fieldOffset("cleanMe", LinkedTransferQueue.class); |
| 846 |
– |
|
| 850 |
|
} |
