1// RUN: %clang_tsan -O1 %s -o %t && TSAN_OPTIONS="$TSAN_OPTIONS halt_on_error=1" %deflake %run %t | FileCheck %s
2#include <pthread.h>
3#include <stdio.h>
4#include <unistd.h>
5
6int X;
7
8void *Thread(void *x) {
9  sleep(1);
10  X = 42;
11  return 0;
12}
13
14int main() {
15  fprintf(stderr, "BEFORE\n");
16  pthread_t t;
17  pthread_create(&t, 0, Thread, 0);
18  X = 43;
19  pthread_join(t, 0);
20  fprintf(stderr, "AFTER\n");
21  return 0;
22}
23
24// CHECK: BEFORE
25// CHECK: WARNING: ThreadSanitizer: data race
26// CHECK-NOT: AFTER
27
28