libstdc++-v3/testsuite/30_threads/condition_variable/54185.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
   8 // Copyright (C) 2012-2013 Free Software Foundation, Inc.
   9 //
  10 // This file is part of the GNU ISO C++ Library.  This library is free
  11 // software; you can redistribute it and/or modify it under the
  12 // terms of the GNU General Public License as published by the
  13 // Free Software Foundation; either version 3, or (at your option)
  14 // any later version.
  15
  16 // This library is distributed in the hope that it will be useful,
  17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 // GNU General Public License for more details.
  20
  21 // You should have received a copy of the GNU General Public License along
  22 // with this library; see the file COPYING3.  If not see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 #include <vector>
  26 #include <mutex>
  27 #include <condition_variable>
  28 #include <thread>
  29
  30 // PR libstdc++/54185
  31
  32 std::condition_variable* cond = nullptr;
  33 std::mutex mx;
  34 int started = 0;
  35 int constexpr NUM_THREADS = 10;
  36
  37 void do_thread_a()
  38 {
  39   std::unique_lock<std::mutex> lock(mx);
  40   if(++started >= NUM_THREADS)
  41   {
  42     cond->notify_all();
  43     delete cond;
  44     cond = nullptr;
  45   }
  46   else
  47     cond->wait(lock);
  48 }
  49
  50 int main(){
  51   std::vector<std::thread> vec;
  52   for(int j = 0; j < 1000; ++j)
  53   {
  54     started = 0;
  55     cond = new std::condition_variable;
  56     for (int i = 0; i < NUM_THREADS; ++i)
  57       vec.emplace_back(&do_thread_a);
  58     for (int i = 0; i < NUM_THREADS; ++i)
  59       vec[i].join();
  60     vec.clear();
  61   }
  62 }