compiler-rt/test/tsan/libdispatch/async-norace.c

   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
  10 int main() {
  11   fprintf(stderr, "Hello world.\n");
  12   dispatch_semaphore_t done = dispatch_semaphore_create(0);
  13
  14   global = 42;
  15   dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
  16     global = 43;
  17
  18     dispatch_semaphore_signal(done);
  19   });
  20
  21   dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
  22   fprintf(stderr, "Done.\n");
  23 }
  24
  25 // CHECK: Hello world.
  26 // CHECK: Done.