libstdc++-v3/testsuite/30_threads/barrier/completion.cc

   1 // { dg-do run { target c++20 } }
   2 // { dg-require-gthreads "" }
   3 // { dg-additional-options "-pthread" { target pthread } }
   4 // { dg-add-options libatomic }
   5
   6 // Copyright (C) 2020-2024 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 // This test is based on libcxx/test/std/thread/thread.barrier/completion.pass.cpp
  24 //===----------------------------------------------------------------------===//
  25 //
  26 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  27 // See https://llvm.org/LICENSE.txt for license information.
  28 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  29 //
  30 //===----------------------------------------------------------------------===//
  31
  32 #include <barrier>
  33 #include <thread>
  34
  35 #include <testsuite_hooks.h>
  36
  37 int main(int, char**)
  38 {
  39   int x = 0;
  40   auto comp = [&] { x += 1; };
  41   std::barrier<decltype(comp)> b(2, comp);
  42
  43   std::thread t([&](){
  44       for(int i = 0; i < 10; ++i)
  45         b.arrive_and_wait();
  46   });
  47
  48   for(int i = 0; i < 10; ++i)
  49     b.arrive_and_wait();
  50
  51   VERIFY( x == 10 );
  52   t.join();
  53 }