1 // RUN: %clang_tsan %s -o %t
2 // RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'
3
4 #include "dispatch/dispatch.h"
5
6 #include "../test.h"
7
8 long global;
9
main()10 int main() {
11 fprintf(stderr, "Hello world.\n");
12 dispatch_semaphore_t done = dispatch_semaphore_create(0);
13 barrier_init(&barrier, 2);
14
15 dispatch_queue_t q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
16 dispatch_queue_t bgq = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
17
18 dispatch_async(bgq, ^{
19 dispatch_sync(q, ^{
20 global = 42;
21 });
22 barrier_wait(&barrier);
23 });
24
25 dispatch_async(bgq, ^{
26 barrier_wait(&barrier);
27 dispatch_barrier_sync(q, ^{
28 global = 43;
29 });
30
31 dispatch_async(bgq, ^{
32 barrier_wait(&barrier);
33 global = 44;
34 });
35
36 barrier_wait(&barrier);
37
38 dispatch_semaphore_signal(done);
39 });
40
41 dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
42 fprintf(stderr, "Done.\n");
43 }
44
45 // CHECK: Hello world.
46 // CHECK: Done.
47