libstdc++-v3/testsuite/30_threads/condition_variable/54185.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) 2012-2023 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 #include <vector>
  24 #include <mutex>
  25 #include <condition_variable>
  26 #include <thread>
  27
  28 // PR libstdc++/54185
  29
  30 std::condition_variable* cond = nullptr;
  31 std::mutex mx;
  32 int started = 0;
  33 int constexpr NUM_THREADS = 10;
  34
  35 void do_thread_a()
  36 {
  37   std::unique_lock<std::mutex> lock(mx);
  38   if(++started >= NUM_THREADS)
  39   {
  40     cond->notify_all();
  41     delete cond;
  42     cond = nullptr;
  43   }
  44   else
  45     cond->wait(lock);
  46 }
  47
  48 int main(){
  49   std::vector<std::thread> vec;
  50   for(int j = 0; j < 1000; ++j)
  51   {
  52     started = 0;
  53     cond = new std::condition_variable;
  54     for (int i = 0; i < NUM_THREADS; ++i)
  55       vec.emplace_back(&do_thread_a);
  56     for (int i = 0; i < NUM_THREADS; ++i)
  57       vec[i].join();
  58     vec.clear();
  59   }
  60 }