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// { dg-do run { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* *-*-cygwin *-*-darwin* powerpc-ibm-aix* } }
// { dg-options " -std=gnu++11 -pthread" { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* powerpc-ibm-aix* } }
// { dg-options " -std=gnu++11 -pthreads" { target *-*-solaris* } }
// { dg-options " -std=gnu++11 " { target *-*-cygwin *-*-darwin* } }
// { dg-require-cstdint "" }
// { dg-require-gthreads "" }
// { dg-require-atomic-builtins "" }
// Copyright (C) 2014-2015 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// libstdc++/60966
// This test hangs if std::promise::~promise() destroys the
// shared state before std::promise::set_value() finishes using it.
#include <future>
#include <thread>
#include <vector>
const int THREADS = 10;
void run_task(std::promise<void>* pr)
{
std::this_thread::sleep_for(std::chrono::milliseconds(100));
pr->set_value();
}
int main()
{
std::vector<std::promise<void>*> tasks(THREADS);
std::vector<std::thread> threads(THREADS);
std::vector<std::future<void>> futures(THREADS);
for (int i = 0; i < THREADS; ++i)
{
std::promise<void>* task = new std::promise<void>;
tasks[i] = task;
futures[i] = task->get_future();
threads[i] = std::thread(run_task, task);
}
for (int i = 0; i < THREADS; ++i)
{
// the temporary future releases the state as soon as wait() returns
std::future<void>(std::move(futures[i])).wait();
// state is ready, should now be safe to delete promise, so it
// releases the shared state too
delete tasks[i];
}
for (auto& t : threads)
t.join();
}
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