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//
// Copyright 2010 Ettus Research LLC
//
// 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/>.
//
#include <uhd/transport/udp_zero_copy.hpp>
#include <boost/cstdint.hpp>
#include <boost/asio.hpp>
#include <boost/thread.hpp>
using namespace uhd::transport;
/***********************************************************************
* Managed receive buffer implementation for udp zero-copy asio:
* Frees the memory held by the const buffer on done.
**********************************************************************/
class managed_recv_buffer_impl : public managed_recv_buffer{
public:
managed_recv_buffer_impl(const boost::asio::const_buffer &buff) : _buff(buff){
_done = false;
}
~managed_recv_buffer_impl(void){
if (not _done) this->done();
}
void done(void){
_done = true;
delete [] boost::asio::buffer_cast<const boost::uint32_t *>(_buff);
}
private:
const boost::asio::const_buffer &get(void){
return _buff;
}
const boost::asio::const_buffer _buff;
bool _done;
};
/***********************************************************************
* Managed send buffer implementation for udp zero-copy asio:
* Sends and frees the memory held by the mutable buffer on done.
**********************************************************************/
class managed_send_buffer_impl : public managed_send_buffer{
public:
managed_send_buffer_impl(
const boost::asio::mutable_buffer &buff,
boost::asio::ip::udp::socket *socket
) : _buff(buff){
_done = false;
_socket = socket;
}
~managed_send_buffer_impl(void){
if (not _done) this->done(0);
}
void done(size_t num_bytes){
_done = true;
boost::uint32_t *mem = boost::asio::buffer_cast<boost::uint32_t *>(_buff);
_socket->send(boost::asio::buffer(mem, num_bytes));
delete [] mem;
}
private:
const boost::asio::mutable_buffer &get(void){
return _buff;
}
const boost::asio::mutable_buffer _buff;
boost::asio::ip::udp::socket *_socket;
bool _done;
};
/***********************************************************************
* Zero Copy UDP implementation with ASIO:
* This is the portable zero copy implementation for systems
* where a faster, platform specific solution is not available.
* However, it is not a true zero copy implementation as each
* send and recv requires a copy operation to/from userspace.
**********************************************************************/
class udp_zero_copy_impl : public udp_zero_copy{
public:
//structors
udp_zero_copy_impl(const std::string &addr, const std::string &port);
~udp_zero_copy_impl(void);
//send/recv
managed_recv_buffer::sptr get_recv_buff(void);
managed_send_buffer::sptr get_send_buff(void);
//resize
size_t resize_recv_buff_size(size_t num_bytes);
size_t resize_send_buff_size(size_t num_bytes);
private:
boost::asio::ip::udp::socket *_socket;
boost::asio::io_service _io_service;
};
udp_zero_copy_impl::udp_zero_copy_impl(const std::string &addr, const std::string &port){
//std::cout << boost::format("Creating udp transport for %s %s") % addr % port << std::endl;
// resolve the address
boost::asio::ip::udp::resolver resolver(_io_service);
boost::asio::ip::udp::resolver::query query(boost::asio::ip::udp::v4(), addr, port);
boost::asio::ip::udp::endpoint receiver_endpoint = *resolver.resolve(query);
// Create, open, and connect the socket
_socket = new boost::asio::ip::udp::socket(_io_service);
_socket->open(boost::asio::ip::udp::v4());
_socket->connect(receiver_endpoint);
}
udp_zero_copy_impl::~udp_zero_copy_impl(void){
delete _socket;
}
managed_recv_buffer::sptr udp_zero_copy_impl::get_recv_buff(void){
//implement timeout through polling and sleeping
size_t available = 0;
boost::asio::deadline_timer timer(_socket->get_io_service());
timer.expires_from_now(boost::posix_time::milliseconds(100));
while (not ((available = _socket->available()) or timer.expires_from_now().is_negative())){
boost::this_thread::sleep(boost::posix_time::milliseconds(1));
}
//receive only if data is available
boost::uint32_t *buff_mem = new boost::uint32_t[available/sizeof(boost::uint32_t)];
if (available){
available = _socket->receive(boost::asio::buffer(buff_mem, available));
}
//create a new managed buffer to house the data
return managed_recv_buffer::sptr(
new managed_recv_buffer_impl(boost::asio::buffer(buff_mem, available))
);
}
managed_send_buffer::sptr udp_zero_copy_impl::get_send_buff(void){
boost::uint32_t *buff_mem = new boost::uint32_t[2000/sizeof(boost::uint32_t)];
return managed_send_buffer::sptr(
new managed_send_buffer_impl(boost::asio::buffer(buff_mem, 2000), _socket)
);
}
size_t udp_zero_copy_impl::resize_recv_buff_size(size_t num_bytes){
boost::asio::socket_base::receive_buffer_size option(num_bytes);
_socket->set_option(option);
_socket->get_option(option);
return option.value();
}
size_t udp_zero_copy_impl::resize_send_buff_size(size_t num_bytes){
boost::asio::socket_base::send_buffer_size option(num_bytes);
_socket->set_option(option);
_socket->get_option(option);
return option.value();
}
/***********************************************************************
* UDP zero copy make function
**********************************************************************/
udp_zero_copy::sptr udp_zero_copy::make(
const std::string &addr, const std::string &port
){
return sptr(new udp_zero_copy_impl(addr, port));
}
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