libstdc++-v3/testsuite/30_threads/shared_mutex/unlock/1.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 #include <shared_mutex>
  23 #include <thread>
  24
  25 using mutex_type = std::shared_mutex;
  26
  27 mutex_type m;
  28
  29 void f()
  30 {
  31   std::lock_guard<mutex_type> l(m);
  32 }
  33
  34 int main()
  35 {
  36   std::thread t1(f);
  37   std::thread t2(f);
  38   t1.join();
  39   t2.join();
  40 }