libstdc++-v3/testsuite/30_threads/lock/2.cc

   1 // { dg-do run }
   2 // { dg-additional-options "-pthread" { target pthread } }
   3 // { dg-require-effective-target c++11 }
   4 // { dg-require-gthreads "" }
   5
   6 // Copyright (C) 2010-2024 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 <mutex>
  25 #include <thread>
  26 #include <functional>
  27 #include <testsuite_hooks.h>
  28
  29 void locker(std::mutex& m1, std::mutex& m2, std::mutex& m3)
  30 {
  31   typedef std::unique_lock<std::mutex> lock_type;
  32
  33   lock_type l1(m1, std::defer_lock);
  34   lock_type l2(m2, std::defer_lock);
  35   lock_type l3(m3, std::defer_lock);
  36   std::lock(l1, l2, l3);
  37   VERIFY( l1.owns_lock() );
  38   VERIFY( l2.owns_lock() );
  39   VERIFY( l3.owns_lock() );
  40 }
  41
  42 void test01()
  43 {
  44   std::mutex m1, m2, m3;
  45   std::thread t1(locker, std::ref(m1), std::ref(m2), std::ref(m3));
  46   std::thread t2(locker, std::ref(m3), std::ref(m2), std::ref(m1));
  47   t1.join();
  48   t2.join();
  49 }
  50
  51 int main()
  52 {
  53   test01();
  54   return 0;
  55 }