mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-23 14:52:24 +00:00
108 lines
2.4 KiB
C++
108 lines
2.4 KiB
C++
/*
|
|
* ZeroTier One - Network Virtualization Everywhere
|
|
* Copyright (C) 2011-2018 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
|