libstdc++-v3/testsuite/30_threads/condition_variable_any/50862.cc

   1 // { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* *-*-cygwin *-*-darwin* powerpc-ibm-aix* } }
   2 // { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-gnu* powerpc-ibm-aix* } }
   3 // { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }
   4 // { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
   5 // { dg-require-cstdint "" }
   6 // { dg-require-gthreads "" }
   7 // { dg-require-sched-yield "" }
   8
   9 // Copyright (C) 2011-2014 Free Software Foundation, Inc.
  10 //
  11 // This file is part of the GNU ISO C++ Library.  This library is free
  12 // software; you can redistribute it and/or modify it under the
  13 // terms of the GNU General Public License as published by the
  14 // Free Software Foundation; either version 3, or (at your option)
  15 // any later version.
  16
  17 // This library is distributed in the hope that it will be useful,
  18 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 // GNU General Public License for more details.
  21
  22 // You should have received a copy of the GNU General Public License along
  23 // with this library; see the file COPYING3.  If not see
  24 // <http://www.gnu.org/licenses/>.
  25
  26 #include <condition_variable>
  27 #include <thread>
  28 #include <mutex>
  29 #include <array>
  30 #include <sstream>
  31
  32 struct scoped_thread
  33 {
  34   ~scoped_thread() { if (t.joinable()) t.join(); }
  35   std::thread t;
  36 };
  37
  38 int main()
  39 {
  40   typedef std::unique_lock<std::mutex> Lock;
  41
  42   std::mutex                  m;
  43   std::condition_variable_any cond;
  44   unsigned int                product = 0;
  45   const unsigned int          count = 10;
  46
  47   // writing to stream causes timing changes which makes deadlock easier
  48   // to reproduce - do not remove
  49   std::ostringstream out;
  50
  51   // create consumers
  52   std::array<scoped_thread, 2> threads;
  53   for (std::size_t i = 0; i < threads.size(); ++i)
  54     threads[i].t
  55       = std::thread( [&]
  56                      {
  57                        for (unsigned int i = 0; i < count; ++i)
  58                          {
  59                            std::this_thread::yield();
  60                            Lock lock(m);
  61                            while(product == 0)
  62                              cond.wait(lock);
  63                            out << "got product "
  64                                << std::this_thread::get_id()
  65                                << ' ' << product << std::endl;
  66                            --product;
  67                          }
  68                      } );
  69
  70   // single producer
  71   for (std::size_t i = 0; i < threads.size() * count; ++i)
  72     {
  73       std::this_thread::yield();
  74       Lock lock(m);
  75       ++product;
  76       out << "setting product " << std::this_thread::get_id()
  77           << ' ' << product << std::endl;
  78       cond.notify_one();
  79     }
  80 }