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 
7 int fd;
8 char buf;
9 
Thread1(void * x)10 void *Thread1(void *x) {
11   buf = 1;
12   barrier_wait(&barrier);
13   return NULL;
14 }
15 
Thread2(void * x)16 void *Thread2(void *x) {
17   write(fd, &buf, 1);
18   return NULL;
19 }
20 
main()21 int main() {
22   barrier_init(&barrier, 2);
23   fd = open("/dev/null", O_WRONLY);
24   if (fd < 0) return 1;
25   pthread_t t[2];
26   pthread_create(&t[0], NULL, Thread1, NULL);
27   barrier_wait(&barrier);
28   pthread_create(&t[1], NULL, Thread2, NULL);
29   pthread_join(t[0], NULL);
30   pthread_join(t[1], NULL);
31   close(fd);
32 }
33 
34 // CHECK: WARNING: ThreadSanitizer: data race
35 // CHECK:   Read of size 1
36 // CHECK:     #0 write
37 // CHECK:   Previous write of size 1
38 // CHECK:     #0 Thread1
39