libstdc++-v3/testsuite/30_threads/latch/3.cc

   1 // Copyright (C) 2020-2022 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-options "-std=gnu++2a" }
  19 // { dg-do run { target c++2a } }
  20 // { dg-require-gthreads "" }
  21 // { dg-additional-options "-pthread" { target pthread } }
  22 // { dg-add-options libatomic }
  23
  24 #include <latch>
  25 #include <atomic>
  26 #include <thread>
  27 #include <testsuite_hooks.h>
  28
  29 void
  30 test01()
  31 {
  32   std::latch l(3);
  33
  34   VERIFY( !l.try_wait() );
  35
  36   auto fn = [&]
  37   {
  38     l.count_down();
  39   };
  40
  41   std::thread t0(fn);
  42   std::thread t1(fn);
  43
  44   l.arrive_and_wait();
  45   t0.join();
  46   t1.join();
  47
  48   VERIFY( l.try_wait() );
  49 }
  50
  51 void
  52 test02()
  53 {
  54   std::latch l(3);
  55   std::thread t([&]
  56     {
  57       l.count_down();
  58     });
  59
  60   l.arrive_and_wait(2);
  61   t.join();
  62   VERIFY( l.try_wait() );
  63 }
  64
  65 int main()
  66 {
  67   test01();
  68   test02();
  69   return 0;
  70 }