compiler-rt/test/tsan/libdispatch/semaphore-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.");
  12
  13     global = 42;
  14
  15     dispatch_semaphore_t sem = dispatch_semaphore_create(0);
  16     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
  17
  18         global = 43;
  19         dispatch_semaphore_signal(sem);
  20     });
  21
  22     dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
  23     global = 44;
  24
  25     fprintf(stderr, "Done.");
  26     return 0;
  27 }
  28
  29 // CHECK: Hello world.
  30 // CHECK: Done.