(selectThreadMutex): New field.
	(selectThread): New field.
	(unhandledWakeup): New field.
	(implCloseSelector): Added skeleton code which
	synchronizes as per Sun JRE JavaDoc.
	(keys): Throw ClosedSelectorException if selector
	is closed.
	(selectNow): Added comment that we're faking out
	an immediate select with a one-microsecond-timeout one.
	(select): Use 0 instead of -1 for infinite timeout.
	(implSelect): Changed comment in declaration.
	(select): Added synchronized to method declaration.
	Added synchronization and wakeup support as per Sun
	JRE JavaDoc.
	(selectedKeys): Throw ClosedSelectorException if selector
	is closed.
	(wakeup): Implemented.
	(deregisterCancelledKeys): Synchronize on cancelled key
	set before deregistering.
	(register): Synchronize on key set before registering.
	* java/nio/channels/spi/AbstractSelector.java
	Added import for java.nio.channels.ClosedSelectorException.
	(close): Added synchronized to method declaration.
	(cancelledKeys): Throw ClosedSelectorException if selector
	is closed.
	(cancelKey): Synchronize on cancelled key set before key.

From-SVN: r74879