test/tsan/Darwin/gcd-blocks.mm

   1 // RUN: %clangxx_tsan %s -o %t -framework Foundation
   2 // RUN: %run %t 2>&1 | FileCheck %s
   3
   4 #import <Foundation/Foundation.h>
   5
   6 int main() {
   7   fprintf(stderr, "start\n");
   8
   9   dispatch_queue_t background_q = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
  10   dispatch_queue_t main_q = dispatch_get_main_queue();
  11
  12   dispatch_async(background_q, ^{
  13     __block long block_var = 0;
  14
  15     dispatch_sync(main_q, ^{
  16       block_var = 42;
  17     });
  18
  19     fprintf(stderr, "block_var = %ld\n", block_var);
  20
  21     dispatch_sync(dispatch_get_main_queue(), ^{
  22       CFRunLoopStop(CFRunLoopGetCurrent());
  23     });
  24   });
  25
  26   CFRunLoopRun();
  27   fprintf(stderr, "done\n");
  28 }
  29
  30 // CHECK: start
  31 // CHECK: block_var = 42
  32 // CHECK: done
  33 // CHECK-NOT: WARNING: ThreadSanitizer
  34 // CHECK-NOT: CHECK failed