1// RUN: %clang_tsan %s -o %t -framework Foundation
2// RUN: %env_tsan_opts=ignore_interceptors_accesses=1 %run %t 2>&1 | FileCheck %s
3
4#import <Foundation/Foundation.h>
5
6long global;
7
8void handler(void *arg) {
9  fprintf(stderr, "global = %ld\n", global);
10
11  dispatch_sync(dispatch_get_main_queue(), ^{
12    CFRunLoopStop(CFRunLoopGetCurrent());
13  });
14}
15
16int main(int argc, const char *argv[]) {
17  dispatch_queue_t queue =
18      dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
19
20  dispatch_source_t source =
21      dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
22
23  dispatch_source_set_timer(source, dispatch_walltime(NULL, 0), 1e9, 5);
24
25  global = 42;
26
27  dispatch_source_set_cancel_handler_f(source, &handler);
28
29  dispatch_resume(source);
30  dispatch_cancel(source);
31
32  CFRunLoopRun();
33
34  return 0;
35}
36
37// CHECK: global = 42
38// CHECK-NOT: WARNING: ThreadSanitizer
39