libstdc++-v3/testsuite/30_threads/shared_mutex/try_lock/2.cc

   1 // { dg-do run { target c++17 } }
   2 // { dg-additional-options "-pthread" { target pthread } }
   3 // { dg-require-gthreads "" }
   4
   5 // Copyright (C) 2015-2024 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22
  23 #include <shared_mutex>
  24 #include <thread>
  25 #include <system_error>
  26 #include <testsuite_hooks.h>
  27
  28 int main()
  29 {
  30   typedef std::shared_mutex mutex_type;
  31
  32   try
  33     {
  34       mutex_type m;
  35       m.lock();
  36       bool b;
  37
  38       std::thread t([&] {
  39         try
  40           {
  41             b = m.try_lock();
  42           }
  43         catch (const std::system_error& e)
  44           {
  45             VERIFY( false );
  46           }
  47       });
  48       t.join();
  49       VERIFY( !b );
  50
  51       m.unlock();
  52     }
  53   catch (const std::system_error& e)
  54     {
  55       VERIFY( false );
  56     }
  57   catch (...)
  58     {
  59       VERIFY( false );
  60     }
  61
  62   return 0;
  63 }