A multi-threaded digital versatile disc system which is controlled by a system thread includes an independent counter thread for controlling the counter parameters. Only the counter thread (and not the system thread) increments and decrements the counter parameters based on an input from the system clock....http://www.google.de/patents/US6272625?utm_source=gb-gplus-sharePatent US6272625 - Apparatus and method for processing events in a digital versatile disc (DVD) system using system threads and separate dormant/awake counter threads and clock driven semaphores
