#define _GNU_SOURCE #include #include #include #include #include #define THREADS 500 void * foo (void *arg) { pthread_mutex_t *mutex = arg; pthread_mutex_lock (mutex); pthread_mutex_unlock (mutex); return mutex; } int main (int argc, char **argv) { int i; error_t err; pthread_t tid[THREADS]; pthread_mutex_t mutex[THREADS]; for (i = 0; i < THREADS; i ++) { mutex[i] = PTHREAD_MUTEX_INITIALIZER; pthread_mutex_lock (&mutex[i]); err = pthread_create (&tid[i], 0, foo, &mutex[i]); if (err) error (1, err, "pthread_create"); sched_yield (); } for (i = THREADS - 1; i >= 0; i --) { void *ret; pthread_mutex_unlock (&mutex[i]); err = pthread_join (tid[i], &ret); if (err) error (1, err, "pthread_join"); assert (ret == &mutex[i]); } return 0; }