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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2017 ZeroTier, Inc. https://www.zerotier.com/
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
*
* --
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial closed-source software that incorporates or links
* directly against ZeroTier software without disclosing the source code
* of your own application.
*/
#ifndef ZT_BLOCKINGQUEUE_HPP
#define ZT_BLOCKINGQUEUE_HPP
#include <queue>
#include <mutex>
#include <condition_variable>
#include <chrono>
namespace ZeroTier {
/**
* Simple C++11 thread-safe queue
*
* Do not use in node/ since we have not gone C++11 there yet.
*/
template <class T>
class BlockingQueue
{
public:
BlockingQueue(void) : r(true) {}
inline void post(T t)
{
std::lock_guard<std::mutex> lock(m);
q.push(t);
c.notify_one();
}
inline void stop(void)
{
std::lock_guard<std::mutex> lock(m);
r = false;
c.notify_all();
}
inline bool get(T &value)
{
std::unique_lock<std::mutex> lock(m);
if (!r) return false;
while (q.empty()) {
c.wait(lock);
if (!r) return false;
}
value = q.front();
q.pop();
return true;
}
enum TimedWaitResult
{
OK,
TIMED_OUT,
STOP
};
inline TimedWaitResult get(T &value,const unsigned long ms)
{
const std::chrono::milliseconds ms2{ms};
std::unique_lock<std::mutex> lock(m);
if (!r) return STOP;
while (q.empty()) {
if (c.wait_for(lock,ms2) == std::cv_status::timeout)
return ((r) ? TIMED_OUT : STOP);
else if (!r)
return STOP;
}
value = q.front();
q.pop();
return OK;
}
private:
volatile bool r;
std::queue<T> q;
std::mutex m;
std::condition_variable c;
};
} // namespace ZeroTier
#endif
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