Patricia Balbastre UPVLC patricia@disca.upv.es Ismael Ripoll UPVLC iripoll@disca.upv.es 2003 OCERA Consortium Real-Time, POSIX, barriers, synchronisation Barriers, are defined in the advanced real-time POSIX (IEEE Std 1003.1-2001), as part of the advanced real-time threads extensions. A barrier is a simple and efficient synchronisation utility. Threads using a barrier must wait at a specific point until all have finished before any of them can continue.