libcxx/test/std/thread/thread.semaphore/timed.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // UNSUPPORTED: no-threads
  10 // UNSUPPORTED: c++03, c++11
  11
  12 // XFAIL: availability-synchronization_library-missing
  13
  14 // <semaphore>
  15
  16 #include <semaphore>
  17 #include <thread>
  18 #include <chrono>
  19 #include <cassert>
  20
  21 #include "make_test_thread.h"
  22 #include "test_macros.h"
  23
  24 int main(int, char**)
  25 {
  26   auto const start = std::chrono::steady_clock::now();
  27
  28   std::counting_semaphore<> s(0);
  29
  30   assert(!s.try_acquire_until(start + std::chrono::milliseconds(250)));
  31   assert(!s.try_acquire_for(std::chrono::milliseconds(250)));
  32
  33   std::thread t = support::make_test_thread([&](){
  34     std::this_thread::sleep_for(std::chrono::milliseconds(250));
  35     s.release();
  36     std::this_thread::sleep_for(std::chrono::milliseconds(250));
  37     s.release();
  38   });
  39
  40   assert(s.try_acquire_until(start + std::chrono::seconds(2)));
  41   assert(s.try_acquire_for(std::chrono::seconds(2)));
  42   t.join();
  43
  44   auto const end = std::chrono::steady_clock::now();
  45   assert(end - start < std::chrono::seconds(10));
  46
  47   return 0;
  48 }