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 #include <errno.h>
7*bcaeed49SFangrui Song
8*bcaeed49SFangrui Song int fd;
9*bcaeed49SFangrui Song char buf;
10*bcaeed49SFangrui Song
Thread1(void * x)11*bcaeed49SFangrui Song void *Thread1(void *x) {
12*bcaeed49SFangrui Song barrier_wait(&barrier);
13*bcaeed49SFangrui Song read(fd, &buf, 1);
14*bcaeed49SFangrui Song return NULL;
15*bcaeed49SFangrui Song }
16*bcaeed49SFangrui Song
Thread2(void * x)17*bcaeed49SFangrui Song void *Thread2(void *x) {
18*bcaeed49SFangrui Song read(fd, &buf, 1);
19*bcaeed49SFangrui Song barrier_wait(&barrier);
20*bcaeed49SFangrui Song return NULL;
21*bcaeed49SFangrui Song }
22*bcaeed49SFangrui Song
main()23*bcaeed49SFangrui Song int main() {
24*bcaeed49SFangrui Song barrier_init(&barrier, 2);
25*bcaeed49SFangrui Song fd = open("/dev/random", O_RDONLY);
26*bcaeed49SFangrui Song if (fd < 0) {
27*bcaeed49SFangrui Song fprintf(stderr, "failed to open /dev/random (%d)\n", errno);
28*bcaeed49SFangrui Song return 1;
29*bcaeed49SFangrui Song }
30*bcaeed49SFangrui Song pthread_t t[2];
31*bcaeed49SFangrui Song pthread_create(&t[0], NULL, Thread1, NULL);
32*bcaeed49SFangrui Song pthread_create(&t[1], NULL, Thread2, NULL);
33*bcaeed49SFangrui Song pthread_join(t[0], NULL);
34*bcaeed49SFangrui Song pthread_join(t[1], NULL);
35*bcaeed49SFangrui Song close(fd);
36*bcaeed49SFangrui Song fprintf(stderr, "DONE\n");
37*bcaeed49SFangrui Song }
38*bcaeed49SFangrui Song
39*bcaeed49SFangrui Song // CHECK: WARNING: ThreadSanitizer: data race
40*bcaeed49SFangrui Song // CHECK: Write of size 1
41*bcaeed49SFangrui Song // CHECK: #0 read
42*bcaeed49SFangrui Song // CHECK: Previous write of size 1
43*bcaeed49SFangrui Song // CHECK: #0 read
44*bcaeed49SFangrui Song // CHECK: DONE
45*bcaeed49SFangrui Song
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