Subversion Repositories openrisc

// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* mips-sgi-irix6* powerpc-ibm-aix* } }

// { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* alpha*-*-osf* mips-sgi-irix6* powerpc-ibm-aix* } }

// { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }

// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }

// { dg-require-cstdint "" }

// { dg-require-gthreads "" }

// { dg-require-sched-yield "" }

// Copyright (C) 2011, 2012 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along

// with this library; see the file COPYING3.  If not see

// <http://www.gnu.org/licenses/>. 

#include <condition_variable>

#include <thread>

#include <mutex>

#include <array>

#include <sstream>

struct scoped_thread

{

  ~scoped_thread() { if (t.joinable()) t.join(); }

  std::thread t;

};

int main()

{

  typedef std::unique_lock<std::mutex> Lock;

  std::mutex                  m;

  std::condition_variable_any cond;

  unsigned int                product = 0;

  const unsigned int          count = 10;

  // writing to stream causes timing changes which makes deadlock easier

  // to reproduce - do not remove

  std::ostringstream out;

  // create consumers

  std::array<scoped_thread, 2> threads;

  for (std::size_t i = 0; i < threads.size(); ++i)

    threads[i].t

      = std::thread( [&]

                     {

                       for (unsigned int i = 0; i < count; ++i)

                         {

                           std::this_thread::yield();

                           Lock lock(m);

                           while(product == 0)

                             cond.wait(lock);

                           out << "got product "

                               << std::this_thread::get_id()

                               << ' ' << product << std::endl;

                           --product;

                         }

                     } );

  // single producer

  for (std::size_t i = 0; i < threads.size() * count; ++i)

    {

      std::this_thread::yield();

      Lock lock(m);

      ++product;

      out << "setting product " << std::this_thread::get_id()

          << ' ' << product << std::endl;

      cond.notify_one();

    }

}