1// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2#include <pthread.h>
3#include <stdio.h>
4#include <unistd.h>
5
6int Global;
7
8void *Thread1(void *x) {
9  sleep(1);
10  Global = 42;
11  return NULL;
12}
13
14void *Thread2(void *x) {
15  Global = 43;
16  return NULL;
17}
18
19int main() {
20  pthread_t t[2];
21  pthread_create(&t[0], NULL, Thread1, NULL);
22  pthread_create(&t[1], NULL, Thread2, NULL);
23  pthread_join(t[0], NULL);
24  pthread_join(t[1], NULL);
25  return 0;
26}
27
28// CHECK: WARNING: ThreadSanitizer: data race
29
30