I've installed RTLinux v3.0 (2.2.18) and everything appears to be working just fine. However, the thread_app regression test complains that poll (on fifo) is not available. It appears to be implemented in the source so I was just curious if someone might be able to explain it. I'm new to RTLinux so please don't shoot me if this is a repeated question. Thanks. Brad Fitzgibbons bradf@cc.gatech.edu