This source file includes following definitions.
- ba_lock
- main
1
2 #include <stdio.h>
3 #include <pthread.h>
4
5 pthread_mutex_t a = PTHREAD_MUTEX_INITIALIZER;
6 pthread_mutex_t b = PTHREAD_MUTEX_INITIALIZER;
7 pthread_barrier_t bar;
8
9 void *ba_lock(void *arg)
10 {
11 int ret, i;
12
13 pthread_mutex_lock(&b);
14
15 if (pthread_barrier_wait(&bar) == PTHREAD_BARRIER_SERIAL_THREAD)
16 pthread_barrier_destroy(&bar);
17
18 pthread_mutex_lock(&a);
19
20 pthread_mutex_unlock(&a);
21 pthread_mutex_unlock(&b);
22 }
23
24 int main(void)
25 {
26 pthread_t t;
27
28 pthread_barrier_init(&bar, NULL, 2);
29
30 if (pthread_create(&t, NULL, ba_lock, NULL)) {
31 fprintf(stderr, "pthread_create() failed\n");
32 return 1;
33 }
34 pthread_mutex_lock(&a);
35
36 if (pthread_barrier_wait(&bar) == PTHREAD_BARRIER_SERIAL_THREAD)
37 pthread_barrier_destroy(&bar);
38
39 pthread_mutex_lock(&b);
40
41 pthread_mutex_unlock(&b);
42 pthread_mutex_unlock(&a);
43
44 pthread_join(t, NULL);
45
46 return 0;
47 }