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1// RUN: %clang_tsan %s -o %t2// RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'3 4#include "dispatch/dispatch.h"5 6#include <stdio.h>7 8long global;9 10int 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.41