1 // RUN: %clang_tsan %s -o %t
2 // RUN: %deflake %run %t 2>&1 | FileCheck %s
3
4 #include "dispatch/dispatch.h"
5 #include "../test.h"
6
7 long global;
8
main()9 int main() {
10 fprintf(stderr, "Hello world.\n");
11 print_address("addr=", 1, &global);
12 dispatch_semaphore_t done = dispatch_semaphore_create(0);
13 barrier_init(&barrier, 2);
14
15 dispatch_queue_t q1 = dispatch_queue_create("my.queue1", DISPATCH_QUEUE_CONCURRENT);
16 dispatch_queue_t q2 = dispatch_queue_create("my.queue2", DISPATCH_QUEUE_CONCURRENT);
17
18 global = 42;
19 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
20 dispatch_sync(q1, ^{
21 global = 43;
22 barrier_wait(&barrier);
23 });
24 });
25 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
26 dispatch_sync(q2, ^{
27 barrier_wait(&barrier);
28 global = 44;
29
30 dispatch_semaphore_signal(done);
31 });
32 });
33
34 dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
35 fprintf(stderr, "Done.\n");
36 }
37
38 // CHECK: Hello world.
39 // CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
40 // CHECK: WARNING: ThreadSanitizer: data race
41 // CHECK: Location is global 'global' {{(of size 8 )?}}at [[ADDR]] (sync-race.c.tmp+0x{{[0-9,a-f]+}})
42 // CHECK: Done.
43