Girish - Yes, you're right: pthread_cancel() does nothing. The official word from Apple is that it will never work. You need to use another method to get your child threads to finish. Polling a global after a quanta of work in the child thread is one method. Tim Standing SoftRAID, LLC On Jan 5, 2004, at 10:00 PM, darwin-kernel-request@lists.apple.com wrote: Hi Darwin Devloper, I am doing some assignments related to thread in user space.After doing lots of R & D, I came to know that "pthread_cancel()" is not working properly.The same program is working fine on Linux. _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.