compiler-rt/test/tsan/libdispatch/target-queue-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(int argc, const char *argv[]) {
  11   dispatch_semaphore_t done = dispatch_semaphore_create(0);
  12   dispatch_queue_t target_queue = dispatch_queue_create(NULL, DISPATCH_QUEUE_SERIAL);
  13   dispatch_queue_t q1 = dispatch_queue_create(NULL, DISPATCH_QUEUE_CONCURRENT);
  14   dispatch_queue_t q2 = dispatch_queue_create(NULL, DISPATCH_QUEUE_CONCURRENT);
  15   dispatch_set_target_queue(q1, target_queue);
  16   dispatch_set_target_queue(q2, target_queue);
  17
  18   for (int i = 0; i < 100000; i++) {
  19     dispatch_async(q1, ^{
  20       global++;
  21
  22       if (global == 200000) {
  23         dispatch_semaphore_signal(done);
  24       }
  25     });
  26     dispatch_async(q2, ^{
  27       global++;
  28
  29       if (global == 200000) {
  30         dispatch_semaphore_signal(done);
  31       }
  32     });
  33   }
  34
  35   dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
  36   fprintf(stderr, "Done.\n");
  37   return 0;
  38 }
  39
  40 // CHECK: Done.