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root/jsr166/jsr166/src/jsr166y/LinkedTransferQueue.java

Comparing jsr166/src/jsr166y/LinkedTransferQueue.java (file contents):
Revision 1.12 by dl, Mon Jan 12 17:16:18 2009 UTC vs.
Revision 1.13 by jsr166, Thu Mar 19 04:36:54 2009 UTC

#	Line 739 | Line 739 | public class LinkedTransferQueue<E> exte
739		}
740
741		// Temporary Unsafe mechanics for preliminary release
742	+	private static Unsafe getUnsafe() throws Throwable {
743	+	try {
744	+	return Unsafe.getUnsafe();
745	+	} catch (SecurityException se) {
746	+	try {
747	+	return java.security.AccessController.doPrivileged
748	+	(new java.security.PrivilegedExceptionAction<Unsafe>() {
749	+	public Unsafe run() throws Exception {
750	+	return getUnsafePrivileged();
751	+	}});
752	+	} catch (java.security.PrivilegedActionException e) {
753	+	throw e.getCause();
754	+	}
755	+	}
756	+	}
757	+
758	+	private static Unsafe getUnsafePrivileged()
759	+	throws NoSuchFieldException, IllegalAccessException {
760	+	Field f = Unsafe.class.getDeclaredField("theUnsafe");
761	+	f.setAccessible(true);
762	+	return (Unsafe)f.get(null);
763	+	}
764	+
765	+	private static long fieldOffset(String fieldName)
766	+	throws NoSuchFieldException {
767	+	return _unsafe.objectFieldOffset
768	+	(LinkedTransferQueue.class.getDeclaredField(fieldName));
769	+	}
770	+
771		private static final Unsafe _unsafe;
772		private static final long headOffset;
773		private static final long tailOffset;
774		private static final long cleanMeOffset;
775		static {
776		try {
777	<	if (LinkedTransferQueue.class.getClassLoader() != null) {
778	<	Field f = Unsafe.class.getDeclaredField("theUnsafe");
779	<	f.setAccessible(true);
780	<	_unsafe = (Unsafe)f.get(null);
781	<	}
753	<	else
754	<	_unsafe = Unsafe.getUnsafe();
755	<	headOffset = _unsafe.objectFieldOffset
756	<	(LinkedTransferQueue.class.getDeclaredField("head"));
757	<	tailOffset = _unsafe.objectFieldOffset
758	<	(LinkedTransferQueue.class.getDeclaredField("tail"));
759	<	cleanMeOffset = _unsafe.objectFieldOffset
760	<	(LinkedTransferQueue.class.getDeclaredField("cleanMe"));
761	<	} catch (Exception e) {
777	>	_unsafe = getUnsafe();
778	>	headOffset = fieldOffset("head");
779	>	tailOffset = fieldOffset("tail");
780	>	cleanMeOffset = fieldOffset("cleanMe");
781	>	} catch (Throwable e) {
782		throw new RuntimeException("Could not initialize intrinsics", e);
783		}
784		}

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