1/*
2 * Test program that triggers a race between pthread_barrier_wait() and
3 * pthread_barrier_destroy(): proper synchronization is missing between
4 * the pthread_barrier_wait() and the pthread_barrier_destroy() calls. This
5 * test program is based on the example that was posted on February 5, 2009 by
6 * Christoph Bartoschek on the valgrind-users mailing list. Redistribution of
7 * the source code below is permitted under the GPLv2 license.
8 *
9 * See also http://article.gmane.org/gmane.comp.debugging.valgrind/8945/match=pthread_barrier_wait
10 */
11
12
13#define _GNU_SOURCE
14
15#include <pthread.h>
16#include <stdlib.h>
17#include <unistd.h>
18
19static pthread_barrier_t* barrier;
20
21
22static void* thread(void* arg)
23{
24  pthread_barrier_wait(barrier);
25  return NULL;
26}
27
28int main()
29{
30  pthread_t tid;
31
32  barrier = (pthread_barrier_t *) malloc(sizeof(*barrier));
33  pthread_barrier_init(barrier, NULL, 2);
34
35  pthread_create(&tid, NULL, thread, NULL);
36
37  pthread_barrier_wait(barrier);
38  /*
39   * The sleep() call below ensures that the pthread_barrier_destroy() call
40   * happens after the created thread has returned from pthread_barrier_wait().
41   */
42  sleep(1);
43  pthread_barrier_destroy(barrier);
44  free(barrier);
45
46  pthread_join(tid, NULL);
47  return 0;
48}
49