compiler-rt/test/tsan/libdispatch/sync-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 static const long nIter = 1000;
  11
  12 int main() {
  13   fprintf(stderr, "Hello world.\n");
  14   dispatch_semaphore_t done = dispatch_semaphore_create(0);
  15
  16   dispatch_queue_t serial_q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL);
  17
  18   global = 42;
  19   for (int i = 0; i < nIter; i++) {
  20     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
  21       dispatch_sync(serial_q, ^{
  22         global = i;
  23
  24         if (i == nIter - 1) {
  25           dispatch_semaphore_signal(done);
  26         }
  27       });
  28     });
  29   }
  30
  31   dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
  32   fprintf(stderr, "Done.\n");
  33 }
  34
  35 // CHECK: Hello world.
  36 // CHECK: Done.