1 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2 
3 // pthread barriers are not available on OS X
4 // UNSUPPORTED: darwin
5 
6 #include <pthread.h>
7 #include <stdio.h>
8 #include <stddef.h>
9 #include <unistd.h>
10 
11 pthread_barrier_t B;
12 int Global;
13 
Thread1(void * x)14 void *Thread1(void *x) {
15   if (pthread_barrier_wait(&B) == PTHREAD_BARRIER_SERIAL_THREAD)
16     pthread_barrier_destroy(&B);
17   return NULL;
18 }
19 
Thread2(void * x)20 void *Thread2(void *x) {
21   if (pthread_barrier_wait(&B) == PTHREAD_BARRIER_SERIAL_THREAD)
22     pthread_barrier_destroy(&B);
23   return NULL;
24 }
25 
main()26 int main() {
27   pthread_barrier_init(&B, 0, 2);
28   pthread_t t;
29   pthread_create(&t, NULL, Thread1, NULL);
30   Thread2(0);
31   pthread_join(t, NULL);
32   return 0;
33 }
34 
35 // CHECK:      WARNING: ThreadSanitizer: data race
36