libstdc++-v3/testsuite/20_util/shared_ptr/atomic/2.cc

   1 // Copyright (C) 2014-2022 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-do run { target c++11 } }
  19 // { dg-require-gthreads "" }
  20
  21 #include <memory>
  22
  23 int main()
  24 {
  25   using test_type = std::__shared_ptr<int, std::_S_single>;
  26   bool test __attribute__ ((unused)) = false;
  27   constexpr auto mo = std::memory_order_seq_cst;
  28   const test_type p;
  29   test = std::atomic_is_lock_free(&p);
  30   test_type p2 = std::atomic_load(&p);
  31   test_type p3 = std::atomic_load_explicit(&p, mo);
  32   std::atomic_store(&p2, p);
  33   std::atomic_store_explicit(&p2, p, mo);
  34   test_type p4 = std::atomic_exchange(&p2, p);
  35   p4 = std::atomic_exchange_explicit(&p2, p, mo);
  36   test = std::atomic_compare_exchange_weak(&p2, &p3, p);
  37   test = std::atomic_compare_exchange_strong(&p2, &p3, p);
  38   test = std::atomic_compare_exchange_weak_explicit(&p2, &p3, p, mo, mo);
  39   test = std::atomic_compare_exchange_strong_explicit(&p2, &p3, p, mo, mo);
  40 }