1 // RUN: %clang_tsan %s -o %t
2 // RUN: %deflake %run %t 2>&1 | FileCheck %s
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 print_address("addr=", 1, &global);
13 dispatch_semaphore_t done = dispatch_semaphore_create(0);
14 barrier_init(&barrier, 2);
15
16 global = 42;
17 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
18 global = 43;
19 barrier_wait(&barrier);
20 });
21
22 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
23 barrier_wait(&barrier);
24 global = 44;
25
26 dispatch_semaphore_signal(done);
27 });
28
29 dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
30 fprintf(stderr, "Done.\n");
31 }
32
33 // CHECK: Hello world.
34 // CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
35 // CHECK: WARNING: ThreadSanitizer: data race
36 // CHECK: Location is global 'global' {{(of size 8 )?}}at [[ADDR]] (async-race.c.tmp+0x{{[0-9,a-f]+}})
37 // CHECK: Done.
38