libcxx/test/std/thread/thread.barrier/completion.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 // <barrier>
  15
  16 #include <barrier>
  17 #include <thread>
  18 #include <cassert>
  19
  20 #include "make_test_thread.h"
  21 #include "test_macros.h"
  22
  23 int main(int, char**)
  24 {
  25   int x = 0;
  26   auto comp = [&]() noexcept { x += 1; };
  27   std::barrier<decltype(comp)> b(2, comp);
  28
  29   std::thread t = support::make_test_thread([&](){
  30       for(int i = 0; i < 10; ++i)
  31         b.arrive_and_wait();
  32   });
  33
  34   for(int i = 0; i < 10; ++i)
  35     b.arrive_and_wait();
  36
  37   assert(x == 10);
  38   t.join();
  39   return 0;
  40 }