libcxx/test/std/thread/thread.semaphore/binary.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 <chrono>
  18 #include <thread>
  19 #include <type_traits>
  20
  21 #include "make_test_thread.h"
  22 #include "test_macros.h"
  23
  24 static_assert(std::is_same<std::binary_semaphore, std::counting_semaphore<1>>::value, "");
  25
  26 int main(int, char**)
  27 {
  28   std::binary_semaphore s(1);
  29
  30   auto l = [&](){
  31     for(int i = 0; i < 1024; ++i) {
  32         s.acquire();
  33         std::this_thread::sleep_for(std::chrono::microseconds(1));
  34         s.release();
  35     }
  36   };
  37
  38   std::thread t = support::make_test_thread(l);
  39   l();
  40
  41   t.join();
  42
  43   return 0;
  44 }