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root/jsr166/jsr166/src/main/java/util/concurrent/CopyOnWriteArrayList.java

Comparing jsr166/src/main/java/util/concurrent/CopyOnWriteArrayList.java (file contents):
Revision 1.55 by jsr166, Sun Sep 11 03:13:26 2005 UTC vs.
Revision 1.56 by jsr166, Wed Sep 14 22:52:49 2005 UTC

#	Line 41 | Line 41 | import sun.misc.Unsafe;
41		*
42		* <p>All elements are permitted, including <tt>null</tt>.
43		*
44	+	* <p>Memory consistency effects: As with other concurrent
45	+	* collections, actions in a thread prior to placing an object into a
46	+	* {@code CopyOnWriteArrayList}
47	+	* <a href="package-summary.html#MemoryVisibility"><i>happen-before</i></a>
48	+	* actions subsequent to the access or removal of that element from
49	+	* the {@code CopyOnWriteArrayList} in another thread.
50	+	*
51		* <p>This class is a member of the
52		* <a href="{@docRoot}/../guide/collections/index.html">
53		* Java Collections Framework</a>.
54		*
48	–	* <p>
49	–	* Memory consistency effects: As with other concurrent collections, state
50	–	* changes to any object made prior to placing it into a <tt>CopyOnWriteArrayList</tt>
51	–	* <a href="package-summary.html#MemoryVisibility"><i>happen-before</i></a>
52	–	* that element is accessed via or removed from the <tt>CopyOnWriteArrayList</tt>.
53	–	*
55		* @since 1.5
56		* @author Doug Lea
57		* @param <E> the type of elements held in this collection
#	Line 350 | Line 351 | public class CopyOnWriteArrayList<E>
351		lock.lock();
352		try {
353		Object[] elements = getArray();
353	–	int len = elements.length;
354		Object oldValue = elements[index];
355
356		if (oldValue != element) {
357	+	int len = elements.length;
358		Object[] newElements = Arrays.copyOf(elements, len);
359		newElements[index] = element;
360		setArray(newElements);
361	+	} else {
362	+	// Not quite a no-op; ensures volatile write semantics
363	+	setArray(elements);
364		}
365		return (E)oldValue;
366		} finally {
#	Line 1276 | Line 1280 | public class CopyOnWriteArrayList<E>
1280		}
1281
1282		// Support for resetting lock while deserializing
1283	<	private static final Unsafe unsafe =  Unsafe.getUnsafe();
1283	>	private static final Unsafe unsafe = Unsafe.getUnsafe();
1284		private static final long lockOffset;
1285		static {
1286		try {

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