libstdc++-v3/testsuite/29_atomics/atomic_flag/test_and_set/implicit.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-thread-fence "" }
   3
   4 // Copyright (C) 2008-2019 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <atomic>
  22
  23 int main()
  24 {
  25   using namespace std;
  26   atomic_flag af = ATOMIC_FLAG_INIT;
  27
  28   if (!af.test_and_set())
  29     af.clear();
  30
  31   return 0;
  32 }