libstdc++-v3/testsuite/30_threads/condition_variable/54185.cc

   1 // { dg-do run }
   2 // { dg-options "-pthread"  }
   3 // { dg-require-effective-target c++11 }
   4 // { dg-require-effective-target pthread }
   5 // { dg-require-gthreads "" }
   6
   7 // Copyright (C) 2012-2019 Free Software Foundation, Inc.
   8 //
   9 // This file is part of the GNU ISO C++ Library.  This library is free
  10 // software; you can redistribute it and/or modify it under the
  11 // terms of the GNU General Public License as published by the
  12 // Free Software Foundation; either version 3, or (at your option)
  13 // any later version.
  14
  15 // This library is distributed in the hope that it will be useful,
  16 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 // GNU General Public License for more details.
  19
  20 // You should have received a copy of the GNU General Public License along
  21 // with this library; see the file COPYING3.  If not see
  22 // <http://www.gnu.org/licenses/>.
  23
  24 #include <vector>
  25 #include <mutex>
  26 #include <condition_variable>
  27 #include <thread>
  28
  29 // PR libstdc++/54185
  30
  31 std::condition_variable* cond = nullptr;
  32 std::mutex mx;
  33 int started = 0;
  34 int constexpr NUM_THREADS = 10;
  35
  36 void do_thread_a()
  37 {
  38   std::unique_lock<std::mutex> lock(mx);
  39   if(++started >= NUM_THREADS)
  40   {
  41     cond->notify_all();
  42     delete cond;
  43     cond = nullptr;
  44   }
  45   else
  46     cond->wait(lock);
  47 }
  48
  49 int main(){
  50   std::vector<std::thread> vec;
  51   for(int j = 0; j < 1000; ++j)
  52   {
  53     started = 0;
  54     cond = new std::condition_variable;
  55     for (int i = 0; i < NUM_THREADS; ++i)
  56       vec.emplace_back(&do_thread_a);
  57     for (int i = 0; i < NUM_THREADS; ++i)
  58       vec[i].join();
  59     vec.clear();
  60   }
  61 }