libstdc++-v3/testsuite/29_atomics/atomic_flag/test/explicit.cc

   1 // { dg-do run { target c++20 } }
   2 // { dg-require-thread-fence "" }
   3
   4 // Copyright (C) 2008-2024 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 #include <testsuite_hooks.h>
  23
  24 void
  25 test01()
  26 {
  27   using namespace std;
  28
  29   atomic_flag af0 = ATOMIC_FLAG_INIT;
  30   VERIFY( ! af0.test(memory_order_acquire) );
  31
  32   atomic_flag af{true};
  33   const atomic_flag& caf = af;
  34
  35   VERIFY( af.test(memory_order_acquire) );
  36   VERIFY( caf.test(memory_order_acquire) );
  37   af.clear(memory_order_release);
  38   VERIFY( ! af.test(memory_order_acquire) );
  39   VERIFY( ! caf.test(memory_order_acquire) );
  40 }
  41
  42 void
  43 test02()
  44 {
  45   using namespace std;
  46
  47   atomic_flag af{true};
  48   const atomic_flag& caf = af;
  49
  50   VERIFY( atomic_flag_test_explicit(&af, memory_order_acquire) );
  51   VERIFY( atomic_flag_test_explicit(&caf, memory_order_acquire) );
  52   af.clear(memory_order_release);
  53   VERIFY( ! atomic_flag_test_explicit(&af, memory_order_acquire) );
  54   VERIFY( ! atomic_flag_test_explicit(&caf, memory_order_acquire) );
  55 }
  56
  57 int
  58 main()
  59 {
  60   test01();
  61   test02();
  62   return 0;
  63 }