atomic_stack.cc revision 6a211c5814e25d6745a5058cc0e499e5235d3821 
1// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2#include <pthread.h>
3#include <unistd.h>
4
5int Global;
6
7void *Thread1(void *x) {
8  sleep(1);
9  __atomic_fetch_add(&Global, 1, __ATOMIC_RELAXED);
10  return NULL;
11}
12
13void *Thread2(void *x) {
14  Global++;
15  return NULL;
16}
17
18int main() {
19  pthread_t t[2];
20  pthread_create(&t[0], NULL, Thread1, NULL);
21  pthread_create(&t[1], NULL, Thread2, NULL);
22  pthread_join(t[0], NULL);
23  pthread_join(t[1], NULL);
24}
25
26// CHECK: WARNING: ThreadSanitizer: data race
27// CHECK:   Atomic write of size 4
28// CHECK:     #0 __tsan_atomic32_fetch_add
29// CHECK:     #1 Thread1
30