libstdc++-v3/testsuite/30_threads/lock_guard/cons/1.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2010-2021 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20
  21 #include <mutex>
  22 #include <testsuite_hooks.h>
  23
  24 struct Mutex
  25 {
  26   Mutex() : locked(false) { }
  27
  28   ~Mutex() noexcept(false)
  29   {
  30     if (locked)
  31       throw 0;
  32   }
  33
  34   void lock()
  35   {
  36     if (locked)
  37       throw 0;
  38     locked = true;
  39   }
  40
  41   void unlock()
  42   {
  43     if (!locked)
  44       throw 0;
  45     locked = false;
  46   }
  47
  48   bool locked;
  49 };
  50
  51 void test01()
  52 {
  53   Mutex m;
  54   m.lock();
  55
  56   try
  57     {
  58       std::lock_guard<Mutex> l(m, std::adopt_lock);
  59     }
  60   catch (...)
  61     {
  62       VERIFY( false );
  63     }
  64
  65   VERIFY( !m.locked );
  66 }
  67
  68 int main()
  69 {
  70   test01();
  71   return 0;
  72 }