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) 2014-2015 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
34const int THREADS = 10;
35
36void run_task(std::promise<void>* pr)
37{
38  std::this_thread::sleep_for(std::chrono::milliseconds(100));
39  pr->set_value();
40}
41
42int 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}
68