1// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2#include "test.h"
3#include <sys/types.h>
4#include <sys/stat.h>
5#include <fcntl.h>
6#include <errno.h>
7
8int fd;
9char buf;
10
11void *Thread1(void *x) {
12  barrier_wait(&barrier);
13  read(fd, &buf, 1);
14  return NULL;
15}
16
17void *Thread2(void *x) {
18  read(fd, &buf, 1);
19  barrier_wait(&barrier);
20  return NULL;
21}
22
23int main() {
24  barrier_init(&barrier, 2);
25  fd = open("/dev/random", O_RDONLY);
26  if (fd < 0) {
27    fprintf(stderr, "failed to open /dev/random (%d)\n", errno);
28    return 1;
29  }
30  pthread_t t[2];
31  pthread_create(&t[0], NULL, Thread1, NULL);
32  pthread_create(&t[1], NULL, Thread2, NULL);
33  pthread_join(t[0], NULL);
34  pthread_join(t[1], NULL);
35  close(fd);
36  fprintf(stderr, "DONE\n");
37}
38
39// CHECK: WARNING: ThreadSanitizer: data race
40// CHECK:   Write of size 1
41// CHECK:     #0 read
42// CHECK:   Previous write of size 1
43// CHECK:     #0 read
44// CHECK: DONE
45
46