I've been puzzling over something that I thought someone on this list might have a good solution for. I need to make a low priority (non-real time) thread wait for a real time thread to do something. I can't use a semaphore or condition variable for this, because that would mean the low priority thread must briefly take a lock while examining the condition variable or sempahore. If it were to be pre-empted while holding this lock, the RT thread could block waiting to obtain the lock in order to signal the condition or modify the semaphore. I could prevent this by raising the priority of the low priority thread before taking the lock, but I don't know how to do this in a portable way (i.e., I want my app to port to windows and mac, but even on "posix compliant" systems, getting RT privileges seems to be pretty system-dependent). It occurs to me that I could just "busy wait" using a timer, which would work but is a bit inelegant. Has anyone else come up with a good solution for this problem? Thanks for any thoughts -- Ken McMillan __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com