Parallel programming / Synchronization using JavaScript Web Workers

Question

Are there any synchronization primitives like Barriers, Semaphors, Locks, Monitors, ... available in JavaScript / Web Workers or is there

Answer 1

Here you have a library based on jQuery made for that purpose: http://www.megiddo.ch/jcon-q-rency.

Of course the model is not really identical to java.util.concurrent since we are not dealing with the same environment, as explained in the other answers...