libstdc++-v3/testsuite/29_atomics/atomic_ref/wait_notify.cc

   1 // { dg-options "-std=gnu++2a -pthread" }
   2 // { dg-do run { target c++2a } }
   3 // { dg-require-effective-target pthread }
   4 // { dg-require-gthreads "" }
   5 // { dg-add-options libatomic }
   6
   7 // Copyright (C) 2020-2022 Free Software Foundation, Inc.
   8 //
   9 // This file is part of the GNU ISO C++ Library.  This library is free
  10 // software; you can redistribute it and/or modify it under the
  11 // terms of the GNU General Public License as published by the
  12 // Free Software Foundation; either version 3, or (at your option)
  13 // any later version.
  14
  15 // This library is distributed in the hope that it will be useful,
  16 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 // GNU General Public License for more details.
  19
  20 // You should have received a copy of the GNU General Public License along
  21 // with this library; see the file COPYING3.  If not see
  22 // <http://www.gnu.org/licenses/>.
  23
  24 #include <atomic>
  25 #include <thread>
  26
  27 #include <testsuite_hooks.h>
  28
  29 template<typename S>
  30   void
  31   test (S va, S vb)
  32   {
  33     if constexpr (std::atomic_ref<S>::is_always_lock_free)
  34     {
  35       S aa{ va };
  36       std::atomic_ref<S> a{ aa };
  37       a.wait(vb);
  38       std::thread t([&]
  39         {
  40           a.store(vb);
  41           a.notify_one();
  42         });
  43       a.wait(va);
  44       t.join();
  45     }
  46   }
  47
  48 int
  49 main ()
  50 {
  51   test<int>(0, 42);
  52   test<long>(0, 42);
  53   test<unsigned>(0u, 42u);
  54   test<float>(0.0f, 42.0f);
  55   test<double>(0.0, 42.0);
  56   test<void*>(nullptr, reinterpret_cast<void*>(42));
  57
  58   struct S{ int i; };
  59   test<S>(S{ 0 }, S{ 42 });
  60   return 0;
  61 }