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 <stdio.h>
7
8 long global;
9 dispatch_semaphore_t done;
10
handler(void * arg)11 void handler(void *arg) {
12 fprintf(stderr, "global = %ld\n", global);
13
14 dispatch_semaphore_signal(done);
15 }
16
main(int argc,const char * argv[])17 int main(int argc, const char *argv[]) {
18 done = dispatch_semaphore_create(0);
19
20 dispatch_queue_t queue =
21 dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
22
23 dispatch_source_t source =
24 dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
25
26 dispatch_source_set_timer(source, dispatch_walltime(NULL, 0), 1e9, 5);
27
28 global = 42;
29
30 dispatch_source_set_cancel_handler_f(source, &handler);
31
32 dispatch_resume(source);
33 dispatch_cancel(source);
34
35 dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
36
37 return 0;
38 }
39
40 // CHECK: global = 42
41