1 | // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s |
2 | #include "test.h" |
3 | #include <sys/types.h> |
4 | #include <sys/stat.h> |
5 | #include <fcntl.h> |
6 | #include <errno.h> |
7 | |
8 | int fd; |
9 | char buf; |
10 | |
11 | void *Thread1(void *x) { |
12 | barrier_wait(barrier: &barrier); |
13 | read(fd: fd, buf: &buf, nbytes: 1); |
14 | return NULL; |
15 | } |
16 | |
17 | void *Thread2(void *x) { |
18 | read(fd: fd, buf: &buf, nbytes: 1); |
19 | barrier_wait(barrier: &barrier); |
20 | return NULL; |
21 | } |
22 | |
23 | int main() { |
24 | barrier_init(barrier: &barrier, count: 2); |
25 | fd = open(file: "/dev/random" , O_RDONLY); |
26 | if (fd < 0) { |
27 | fprintf(stderr, format: "failed to open /dev/random (%d)\n" , errno); |
28 | return 1; |
29 | } |
30 | pthread_t t[2]; |
31 | pthread_create(newthread: &t[0], NULL, start_routine: Thread1, NULL); |
32 | pthread_create(newthread: &t[1], NULL, start_routine: Thread2, NULL); |
33 | pthread_join(th: t[0], NULL); |
34 | pthread_join(th: t[1], NULL); |
35 | close(fd: fd); |
36 | fprintf(stderr, format: "DONE\n" ); |
37 | } |
38 | |
39 | // CHECK: WARNING: ThreadSanitizer: data race |
40 | // CHECK: Write of size 1 |
41 | // CHECK: #0 read |
42 | // CHECK: Previous write of size 1 |
43 | // CHECK: #0 read |
44 | // CHECK: DONE |
45 | |
46 | |