1// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2#include <pthread.h>
3#include <stdio.h>
4#include <unistd.h>
5#include <sys/types.h>
6#include <sys/stat.h>
7#include <fcntl.h>
8
9int fd;
10char buf;
11
12void *Thread1(void *x) {
13  buf = 1;
14  sleep(1);
15  return NULL;
16}
17
18void *Thread2(void *x) {
19  write(fd, &buf, 1);
20  return NULL;
21}
22
23int main() {
24  fd = open("/dev/null", O_WRONLY);
25  if (fd < 0) return 1;
26  pthread_t t[2];
27  pthread_create(&t[0], NULL, Thread1, NULL);
28  sleep(1);
29  pthread_create(&t[1], NULL, Thread2, NULL);
30  pthread_join(t[0], NULL);
31  pthread_join(t[1], NULL);
32  close(fd);
33}
34
35// CHECK: WARNING: ThreadSanitizer: data race
36// CHECK:   Read of size 1
37// CHECK:     #0 write
38// CHECK:   Previous write of size 1
39// CHECK:     #0 Thread1
40