/* Test pthread_mutex_timedlock. */ #define _GNU_SOURCE #include #include #include #include #include #include int main (int argc, char **argv) { error_t err; struct timespec ts; pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER; struct timeval before, after; int diff; gettimeofday (&before, 0); ts.tv_sec = before.tv_sec + 1; ts.tv_nsec = before.tv_usec * 1000; printf ("Starting wait @ %d\n", (int) before.tv_sec); pthread_mutex_lock (&m); /* A default mutex shall dead lock if locked twice. As such we do not need spawn a second thread. */ err = pthread_mutex_timedlock (&m, &ts); assert (err == ETIMEDOUT); gettimeofday (&after, 0); printf ("End wait @ %d\n", (int) after.tv_sec); diff = after.tv_sec * 1000000 + after.tv_usec - before.tv_sec * 1000000 - before.tv_usec; if (diff < 900000 || diff > 1100000) error (1, EGRATUITOUS, "pthread_mutex_timedlock waited %d us", diff); return 0; }