Java LockSupport Memory Consistency

Question

Java 6 API question. Does calling LockSupport.unpark(thread) have a happens-before relationship to the return from LockSupport.park in the just-unparked thread? I strongly suspect the answer is yes, but the Javadoc doesn't seem to mention it explicitly.

Answer 1

I have looked though the JDK code and it looks like LockSupport methods are normally called outside of synchronization blocks. So, your assumption seems to be correct.