I am running an uptodate FC3 - smp kernel 2.6.11-1.27 on a 3.2Ghz pentium 4 w/ht. I have a multi-threaded user app where one thread is doing select() on a single fd with a timeout of 1/2th second (500ms). The fd is not expected to be ready very often - it is the keyboard. However, testing shows that select is returning on average every 3.5ms; 99% of the time RC == -1 and errno == EINTR. strace shows the select is being interrupted by `Unknown signal 33'. I want this thread to be woken up twice a second, not 250+. I have other threads doing useful work. What is SIG33? I suspect that it has something to do with NPTL. Can I block or ignore this signal? I tried sigfillset() and pthread_sigmask() but no joy. Can I change the behaviour of my other threads to affect the frequency of SIG33? Can I affect which thread is going to get SIG33? Is there a better place to ask this question? Thanks, Greg Smith
