libcxx/test/std/thread/thread.semaphore/release.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
  19 #include "make_test_thread.h"
  20 #include "test_macros.h"
  21
  22 int main(int, char**)
  23 {
  24   std::counting_semaphore<> s(0);
  25
  26   s.release();
  27   s.acquire();
  28
  29   std::thread t = support::make_test_thread([&](){
  30     s.acquire();
  31   });
  32   s.release(2);
  33   t.join();
  34   s.acquire();
  35
  36   return 0;
  37 }