1 // RUN: %clangxx_tsan -O1 %s -o %t && not %t 2>&1 | FileCheck %s
2 #include <pthread.h>
3 #include <stdio.h>
4 #include <unistd.h>
5 #include <sys/types.h>
6 #include <sys/stat.h>
7 #include <fcntl.h>
8
9 int fd;
10 char buf;
11
Thread(void * x)12 void *Thread(void *x) {
13 read(fd, &buf, 1);
14 return NULL;
15 }
16
main()17 int main() {
18 fd = open("/dev/random", O_RDONLY);
19 if (fd < 0) return 1;
20 pthread_t t[2];
21 pthread_create(&t[0], NULL, Thread, NULL);
22 pthread_create(&t[1], NULL, Thread, NULL);
23 pthread_join(t[0], NULL);
24 pthread_join(t[1], NULL);
25 close(fd);
26 }
27
28 // CHECK: WARNING: ThreadSanitizer: data race
29 // CHECK: Write of size 1
30 // CHECK: #0 read
31 // CHECK: Previous write of size 1
32 // CHECK: #0 read
33