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
8static const long nIter = 1000;
9
10int main() {
11  NSLog(@"Hello world.");
12
13  global = 42;
14  for (int i = 0; i < nIter; i++) {
15    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
16      dispatch_sync(dispatch_get_main_queue(), ^{
17        global = i;
18
19        if (i == nIter - 1) {
20          CFRunLoopStop(CFRunLoopGetCurrent());
21        }
22      });
23    });
24  }
25
26  CFRunLoopRun();
27  NSLog(@"Done.");
28}
29
30// CHECK: Hello world.
31// CHECK: Done.
32// CHECK-NOT: WARNING: ThreadSanitizer
33