1 // SPDX-License-Identifier: GPL-2.0
5 pthread_mutex_t a = PTHREAD_MUTEX_INITIALIZER;
6 pthread_mutex_t b = PTHREAD_MUTEX_INITIALIZER;
9 void *ba_lock(void *arg)
13 pthread_mutex_lock(&b);
15 if (pthread_barrier_wait(&bar) == PTHREAD_BARRIER_SERIAL_THREAD)
16 pthread_barrier_destroy(&bar);
18 pthread_mutex_lock(&a);
20 pthread_mutex_unlock(&a);
21 pthread_mutex_unlock(&b);
28 pthread_barrier_init(&bar, NULL, 2);
30 if (pthread_create(&t, NULL, ba_lock, NULL)) {
31 fprintf(stderr, "pthread_create() failed\n");
34 pthread_mutex_lock(&a);
36 if (pthread_barrier_wait(&bar) == PTHREAD_BARRIER_SERIAL_THREAD)
37 pthread_barrier_destroy(&bar);
39 pthread_mutex_lock(&b);
41 pthread_mutex_unlock(&b);
42 pthread_mutex_unlock(&a);
44 pthread_join(t, NULL);