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/*
* Test program that triggers a race between pthread_barrier_wait() and
* pthread_barrier_destroy(): proper synchronization is missing between
* the pthread_barrier_wait() and the pthread_barrier_destroy() calls. This
* test program is based on the example that was posted on February 5, 2009 by
* Christoph Bartoschek on the valgrind-users mailing list. Redistribution of
* the source code below is permitted under the GPLv2 license.
*
* See also http://article.gmane.org/gmane.comp.debugging.valgrind/8945/match=pthread_barrier_wait
*/
#define _GNU_SOURCE
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
static pthread_barrier_t* barrier;
static void* thread(void* arg)
{
pthread_barrier_wait(barrier);
return NULL;
}
int main()
{
pthread_t tid;
barrier = (pthread_barrier_t *) malloc(sizeof(*barrier));
pthread_barrier_init(barrier, NULL, 2);
pthread_create(&tid, NULL, thread, NULL);
pthread_barrier_wait(barrier);
/*
* The sleep() call below ensures that the pthread_barrier_destroy() call
* happens after the created thread has returned from pthread_barrier_wait().
*/
sleep(1);
pthread_barrier_destroy(barrier);
free(barrier);
pthread_join(tid, NULL);
return 0;
}
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