drd/tests/pth_barrier_race.c

   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
  19 static pthread_barrier_t* barrier;
  20
  21
  22 static void* thread(void* arg)
  23 {
  24   pthread_barrier_wait(barrier);
  25   return NULL;
  26 }
  27
  28 int 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 }