1// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2#include <pthread.h>
3#include <stdio.h>
4#include <unistd.h>
5
6int fds[2];
7int X;
8
9void *Thread1(void *x) {
10 X = 42;
11 write(fds[1], "a", 1);
12 return NULL;
13}
14
15void *Thread2(void *x) {
16 char buf;
17 while (read(fds[0], &buf, 1) != 1) {
18 }
19 X = 43;
20 return NULL;
21}
22
23int main() {
24 pipe(fds);
25 pthread_t t[2];
26 pthread_create(&t[0], NULL, Thread1, NULL);
27 pthread_create(&t[1], NULL, Thread2, NULL);
28 pthread_join(t[0], NULL);
29 pthread_join(t[1], NULL);
30 fprintf(stderr, "OK\n");
31}
32
33// CHECK-NOT: WARNING: ThreadSanitizer: data race
34