1*bcaeed49SFangrui Song // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2*bcaeed49SFangrui Song #include <pthread.h>
3*bcaeed49SFangrui Song #include <stdio.h>
4*bcaeed49SFangrui Song #include <unistd.h>
5*bcaeed49SFangrui Song #include <sys/types.h>
6*bcaeed49SFangrui Song #include <sys/stat.h>
7*bcaeed49SFangrui Song #include <fcntl.h>
8*bcaeed49SFangrui Song
9*bcaeed49SFangrui Song int fds[2];
10*bcaeed49SFangrui Song
Thread1(void * x)11*bcaeed49SFangrui Song void *Thread1(void *x) {
12*bcaeed49SFangrui Song char buf;
13*bcaeed49SFangrui Song read(fds[0], &buf, 1);
14*bcaeed49SFangrui Song close(fds[0]);
15*bcaeed49SFangrui Song return 0;
16*bcaeed49SFangrui Song }
17*bcaeed49SFangrui Song
Thread2(void * x)18*bcaeed49SFangrui Song void *Thread2(void *x) {
19*bcaeed49SFangrui Song close(fds[1]);
20*bcaeed49SFangrui Song return 0;
21*bcaeed49SFangrui Song }
22*bcaeed49SFangrui Song
main()23*bcaeed49SFangrui Song int main() {
24*bcaeed49SFangrui Song fds[0] = open("/dev/random", O_RDONLY);
25*bcaeed49SFangrui Song fds[1] = dup2(fds[0], 100);
26*bcaeed49SFangrui Song pthread_t t[2];
27*bcaeed49SFangrui Song pthread_create(&t[0], NULL, Thread1, NULL);
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 fprintf(stderr, "OK\n");
32*bcaeed49SFangrui Song }
33*bcaeed49SFangrui Song
34*bcaeed49SFangrui Song // CHECK-NOT: WARNING: ThreadSanitizer: data race
35