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 X;
10
11void *Thread1(void *x) {
12  sleep(1);
13  int f = open("/dev/random", O_RDONLY);
14  char buf;
15  read(f, &buf, 1);
16  close(f);
17  X = 42;
18  return NULL;
19}
20
21void *Thread2(void *x) {
22  X = 43;
23  write(STDOUT_FILENO, "a", 1);
24  return NULL;
25}
26
27int main() {
28  pthread_t t[2];
29  pthread_create(&t[0], NULL, Thread1, NULL);
30  pthread_create(&t[1], NULL, Thread2, NULL);
31  pthread_join(t[0], NULL);
32  pthread_join(t[1], NULL);
33}
34
35// CHECK: WARNING: ThreadSanitizer: data race
36// CHECK:   Write of size 4
37// CHECK:     #0 Thread1
38// CHECK:   Previous write of size 4
39// CHECK:     #0 Thread2
40
41
42