1*bcaeed49SFangrui Song // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2*bcaeed49SFangrui Song #include "test.h"
3*bcaeed49SFangrui Song #include <sys/types.h>
4*bcaeed49SFangrui Song #include <sys/stat.h>
5*bcaeed49SFangrui Song #include <fcntl.h>
6*bcaeed49SFangrui Song
7*bcaeed49SFangrui Song int fd;
8*bcaeed49SFangrui Song char buf;
9*bcaeed49SFangrui Song
Thread1(void * x)10*bcaeed49SFangrui Song void *Thread1(void *x) {
11*bcaeed49SFangrui Song buf = 1;
12*bcaeed49SFangrui Song barrier_wait(&barrier);
13*bcaeed49SFangrui Song return NULL;
14*bcaeed49SFangrui Song }
15*bcaeed49SFangrui Song
Thread2(void * x)16*bcaeed49SFangrui Song void *Thread2(void *x) {
17*bcaeed49SFangrui Song write(fd, &buf, 1);
18*bcaeed49SFangrui Song return NULL;
19*bcaeed49SFangrui Song }
20*bcaeed49SFangrui Song
main()21*bcaeed49SFangrui Song int main() {
22*bcaeed49SFangrui Song barrier_init(&barrier, 2);
23*bcaeed49SFangrui Song fd = open("/dev/null", O_WRONLY);
24*bcaeed49SFangrui Song if (fd < 0) return 1;
25*bcaeed49SFangrui Song pthread_t t[2];
26*bcaeed49SFangrui Song pthread_create(&t[0], NULL, Thread1, NULL);
27*bcaeed49SFangrui Song barrier_wait(&barrier);
28*bcaeed49SFangrui Song pthread_create(&t[1], NULL, Thread2, NULL);
29*bcaeed49SFangrui Song pthread_join(t[0], NULL);
30*bcaeed49SFangrui Song pthread_join(t[1], NULL);
31*bcaeed49SFangrui Song close(fd);
32*bcaeed49SFangrui Song }
33*bcaeed49SFangrui Song
34*bcaeed49SFangrui Song // CHECK: WARNING: ThreadSanitizer: data race
35*bcaeed49SFangrui Song // CHECK: Read of size 1
36*bcaeed49SFangrui Song // CHECK: #0 write
37*bcaeed49SFangrui Song // CHECK: Previous write of size 1
38*bcaeed49SFangrui Song // CHECK: #0 Thread1
39