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

   1 // { dg-do run }
   2 // { dg-options "-std=gnu++17 -pthread" }
   3 // { dg-require-effective-target pthread }
   4 // { dg-require-gthreads "" }
   5
   6 // Copyright (C) 2015-2020 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23
  24 #include <shared_mutex>
  25 #include <thread>
  26 #include <system_error>
  27 #include <testsuite_hooks.h>
  28
  29 int main()
  30 {
  31   typedef std::shared_mutex mutex_type;
  32
  33   try
  34     {
  35       mutex_type m;
  36       m.lock();
  37       bool b;
  38
  39       std::thread t([&] {
  40         try
  41           {
  42             b = m.try_lock();
  43           }
  44         catch (const std::system_error& e)
  45           {
  46             VERIFY( false );
  47           }
  48       });
  49       t.join();
  50       VERIFY( !b );
  51
  52       m.unlock();
  53     }
  54   catch (const std::system_error& e)
  55     {
  56       VERIFY( false );
  57     }
  58   catch (...)
  59     {
  60       VERIFY( false );
  61     }
  62
  63   return 0;
  64 }