libstdc++-v3/testsuite/30_threads/promise/60966.cc

   1 // { dg-do run { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* *-*-cygwin *-*-darwin* powerpc-ibm-aix* } }
   2 // { dg-options " -std=gnu++11 -pthread" { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* powerpc-ibm-aix* } }
   3 // { dg-options " -std=gnu++11 -pthreads" { target *-*-solaris* } }
   4 // { dg-options " -std=gnu++11 " { target *-*-cygwin *-*-darwin* } }
   5 // { dg-require-cstdint "" }
   6 // { dg-require-gthreads "" }
   7 // { dg-require-atomic-builtins "" }
   8
   9 // Copyright (C) 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 // libstdc++/60966
  27 // This test hangs if std::promise::~promise() destroys the
  28 // shared state before std::promise::set_value() finishes using it.
  29
  30 #include <future>
  31 #include <thread>
  32 #include <vector>
  33
  34 const int THREADS = 10;
  35
  36 void run_task(std::promise<void>* pr)
  37 {
  38   std::this_thread::sleep_for(std::chrono::milliseconds(100));
  39   pr->set_value();
  40 }
  41
  42 int main()
  43 {
  44   std::vector<std::promise<void>*> tasks(THREADS);
  45   std::vector<std::thread> threads(THREADS);
  46   std::vector<std::future<void>> futures(THREADS);
  47
  48   for (int i = 0; i < THREADS; ++i)
  49   {
  50     std::promise<void>* task = new std::promise<void>;
  51     tasks[i] = task;
  52     futures[i] = task->get_future();
  53     threads[i] = std::thread(run_task, task);
  54   }
  55
  56   for (int i = 0; i < THREADS; ++i)
  57   {
  58     // the temporary future releases the state as soon as wait() returns
  59     std::future<void>(std::move(futures[i])).wait();
  60     // state is ready, should now be safe to delete promise, so it
  61     // releases the shared state too
  62     delete tasks[i];
  63   }
  64
  65   for (auto& t : threads)
  66     t.join();
  67 }