At Fri, 20 Feb 2004 10:59:14 +0100, Robert Strycek wrote: > it seems that locking / unlocking the same mutex by huge number of threads > causes dead locks. > If I create N=1529 threads (probably system-dependent) that continually > lock the same (non-recursive) mutex, everything is ok, program runs > forever. > But if I increase the value by one (N=1530), program freezes after few > seconds. > This may be a pthread_self() problem (if it's used in mutex > implementation), because I found it returns non-unique id if N>1529. > (You may try to store pthread_self() value of the main thread in a global > variable and assert( ! pthread_equal(main_thread_id, pthread_self()) ) in > thread procedure.)
You use kernel 2.4 + linuxthreads (not for 686). I think this is problem. Try to use kernel 2.6 + NPTL. Debian does not provide "linuxthreads + 2.4 kernel + 686"-based libc6. This means that you don't use even floating stack. So if you want to fix this problem, I think you need to use kernel 2.6. Please test your program which does not become deadlock on kernel 2.6. I think this bug can be marked as fixed. Regards, -- gotom
