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 } 49
