libstdc++-v3/testsuite/30_threads/try_lock/3.cc

   1 // { dg-do run }
   2 // { dg-options "-pthread"  }
   3 // { dg-require-effective-target c++11 }
   4 // { dg-require-effective-target pthread }
   5 // { dg-require-gthreads "" }
   6
   7 // Copyright (C) 2008-2018 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
  25 #include <mutex>
  26 #include <system_error>
  27 #include <testsuite_hooks.h>
  28
  29 struct user_lock
  30 {
  31   user_lock() : is_locked(false) { }
  32   ~user_lock() = default;
  33   user_lock(const user_lock&) = default;
  34
  35   void lock()
  36   {
  37     VERIFY( !is_locked );
  38     is_locked = true;
  39   }
  40
  41   bool try_lock()
  42   { return is_locked ? false : (is_locked = true); }
  43
  44   void unlock()
  45   {
  46     VERIFY( is_locked );
  47     is_locked = false;
  48   }
  49
  50 private:
  51   bool is_locked;
  52 };
  53
  54 int main()
  55 {
  56   try
  57     {
  58       std::mutex m1;
  59       std::recursive_mutex m2;
  60       user_lock m3;
  61
  62       try
  63         {
  64           //heterogeneous types
  65           int result = std::try_lock(m1, m2, m3);
  66           VERIFY( result == -1 );
  67           m1.unlock();
  68           m2.unlock();
  69           m3.unlock();
  70         }
  71       catch (const std::system_error& e)
  72         {
  73           VERIFY( false );
  74         }
  75     }
  76   catch (const std::system_error& e)
  77     {
  78       VERIFY( false );
  79     }
  80   catch (...)
  81     {
  82       VERIFY( false );
  83     }
  84
  85   return 0;
  86 }