Hello Rooters, I am trying to launch a thread (using posix thread) that handles asynchronous events from a root gui. I can avoid a segmentation violation during the thread's initialization only if I put it to sleep immediately after I call the thread. Something like this if (parm1 == 6){ pthread_create(&thread2, NULL, caMonitorThread, (void *)NULL); nanosleep(&tenseconds, NULL); } but of course when an event gets processed sometime later I will get a segmentation violation. I guess I don't understand what memory my TApplication is trying to access while my gui is sitting idly that my thread is also trying to access. I should also note that the thread works if run from main like int main(int argc, char **argv) { pthread_mutex_init(&mutex, NULL); while(1){} return 0; } but fails if int main(int argc, char **argv) { pthread_mutex_init(&mutex, NULL); pthread_create(&thread2, NULL, caMonitorThread, (void *)NULL); TApplication theApp("App", &argc, argv); theApp.Run(); return 0; } Is there something obvious that I should be doing? Thanks a lot Adam DeGrush
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