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/*
* anytun
*
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methods used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2014 Markus Grüneis, Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun 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
* any later version.
*
* Anytun 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 Anytun. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#ifndef ANYTUN_channel_hpp_INCLUDED
#define ANYTUN_channel_hpp_INCLUDED
#include <boost/thread/thread.hpp>
#include <boost/circular_buffer.hpp>
#include <boost/assert.hpp>
#ifdef BOOST_NO_CXX11_DELETED_FUNCTIONS
#include <boost/noncopyable.hpp>
#endif
#include <boost/static_assert.hpp>
#include <boost/type_traits/has_trivial_assign.hpp>
template<typename T>
class Channel
#ifdef BOOST_NO_CXX11_DELETED_FUNCTIONS
: boost::noncopyable
#endif
{
private:
#ifdef BOOST_HAS_TRIVIAL_ASSIGN
BOOST_STATIC_ASSERT((boost::has_trivial_assign<T>::value));
#endif
boost::mutex mtx_;
boost::circular_buffer<T> cb_;
Semaphore sem_read_, sem_write_;
void push_cb(T const & t ) {
boost::lock_guard<boost::mutex> guard(mtx_);
cb_.push_back(t);
}
void pop_cb(T * ret) {
boost::lock_guard<boost::mutex> guard(mtx_);
*ret = cb_[0];
cb_.pop_front();
}
public:
#ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
Channel(Channel const &) = delete;
Channel(Channel &&) = delete;
Channel& operator=(const Channel &) = delete;
#endif
Channel(unsigned int num_elements=10)
:cb_(num_elements),sem_read_(0),sem_write_(num_elements) {};
void push(T const & t ) {
sem_write_.down();
this->push_cb(t);
sem_read_.up();
}
void pop(T * ret) {
sem_read_.down();
this->pop_cb(ret);
sem_write_.up();
}
};
#endif
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