Hi, I'm now implementing something similar to PGPS and I need some help. How to determine if a queue is backlog??? I've carried out some test using PRIO queue. It seems that the prio_dequeue is called right after prio_enqueue and therefore the q.qlen (queue length) is always zero!!!!! That's mean there are no backlog queue at all. Please help!! Thanks in advance, William __________________________________________________ Do you Yahoo!? Yahoo! Tax Center - forms, calculators, tips, more http://taxes.yahoo.com/