test/tsan/Darwin/gcd-semaphore-norace.mm

   1 // RUN: %clang_tsan %s -o %t -framework Foundation
   2 // RUN: %run %t 2>&1 | FileCheck %s
   3
   4 #import <Foundation/Foundation.h>
   5
   6 long global;
   7
   8 int main() {
   9     NSLog(@"Hello world.");
  10
  11     global = 42;
  12
  13     dispatch_semaphore_t sem = dispatch_semaphore_create(0);
  14     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
  15
  16         global = 43;
  17         dispatch_semaphore_signal(sem);
  18     });
  19
  20     dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
  21     global = 44;
  22
  23     NSLog(@"Done.");
  24     return 0;
  25 }
  26
  27 // CHECK: Hello world.
  28 // CHECK: Done.
  29 // CHECK-NOT: WARNING: ThreadSanitizer