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//
// Copyright 2013 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/>.
//
#ifndef INCLUDED_LIBUHD_USRP_COMMON_RECV_PACKET_DEMUXER_3000_HPP
#define INCLUDED_LIBUHD_USRP_COMMON_RECV_PACKET_DEMUXER_3000_HPP
#include <uhd/config.hpp>
#include <uhd/transport/zero_copy.hpp>
#include <stdint.h>
#include <boost/thread.hpp>
#include <uhd/utils/msg.hpp>
#include <uhd/utils/atomic.hpp>
#include <uhd/types/time_spec.hpp>
#include <uhd/utils/byteswap.hpp>
#include <queue>
#include <map>
#include <boost/enable_shared_from_this.hpp>
namespace uhd{ namespace usrp{
struct recv_packet_demuxer_3000 : boost::enable_shared_from_this<recv_packet_demuxer_3000>
{
typedef boost::shared_ptr<recv_packet_demuxer_3000> sptr;
static sptr make(transport::zero_copy_if::sptr xport)
{
return sptr(new recv_packet_demuxer_3000(xport));
}
recv_packet_demuxer_3000(transport::zero_copy_if::sptr xport):
_xport(xport)
{/*NOP*/}
transport::managed_recv_buffer::sptr get_recv_buff(const uint32_t sid, const double timeout)
{
const time_spec_t exit_time = time_spec_t(timeout) + time_spec_t::get_system_time();
transport::managed_recv_buffer::sptr buff;
buff = _internal_get_recv_buff(sid, timeout);
while (not buff) //loop until timeout
{
const time_spec_t delta = exit_time - time_spec_t::get_system_time();
const double new_timeout = delta.get_real_secs();
if (new_timeout < 0.0) break;
buff = _internal_get_recv_buff(sid, new_timeout);
}
return buff;
}
transport::managed_recv_buffer::sptr _internal_get_recv_buff(const uint32_t sid, const double timeout)
{
transport::managed_recv_buffer::sptr buff;
//----------------------------------------------------------
//-- Check the queue to see if we already have a buffer
//----------------------------------------------------------
{
boost::mutex::scoped_lock l(mutex);
queue_type_t &queue = _queues[sid];
if (not queue.empty())
{
buff = queue.front();
queue.front().reset();
queue.pop();
return buff;
}
}
// Following is disabled by default as super_recv_packet_handler (caller) is not thread safe
// Only underlying transport (libusb1_zero_copy) is thread safe
// The onus is on the caller to super_recv_packet_handler (and therefore this) to serialise access
#ifdef RECV_PACKET_DEMUXER_3000_THREAD_SAFE
//----------------------------------------------------------
//-- Try to claim the transport or wait patiently
//----------------------------------------------------------
if (_claimed.cas(1, 0))
{
boost::mutex::scoped_lock l(mutex);
cond.timed_wait(l, boost::posix_time::microseconds(long(timeout*1e6)));
}
//----------------------------------------------------------
//-- Wait on the transport for input buffers
//----------------------------------------------------------
else
#endif // RECV_PACKET_DEMUXER_3000_THREAD_SAFE
{
buff = _xport->get_recv_buff(timeout);
if (buff)
{
const uint32_t new_sid = uhd::wtohx(buff->cast<const uint32_t *>()[1]);
if (new_sid != sid)
{
boost::mutex::scoped_lock l(mutex);
if (_queues.count(new_sid) == 0) UHD_MSG(error)
<< "recv packet demuxer unexpected sid 0x" << std::hex << new_sid << std::dec
<< std::endl;
else _queues[new_sid].push(buff);
buff.reset();
}
}
#ifdef RECV_PACKET_DEMUXER_3000_THREAD_SAFE
_claimed.write(0);
cond.notify_all();
#endif // RECV_PACKET_DEMUXER_3000_THREAD_SAFE
}
return buff;
}
void realloc_sid(const uint32_t sid)
{
boost::mutex::scoped_lock l(mutex);
while(not _queues[sid].empty()) //allocated and clears if already allocated
{
_queues[sid].pop();
}
}
transport::zero_copy_if::sptr make_proxy(const uint32_t sid);
typedef std::queue<transport::managed_recv_buffer::sptr> queue_type_t;
std::map<uint32_t, queue_type_t> _queues;
transport::zero_copy_if::sptr _xport;
#ifdef RECV_PACKET_DEMUXER_3000_THREAD_SAFE
uhd::atomic_uint32_t _claimed;
boost::condition_variable cond;
#endif // RECV_PACKET_DEMUXER_3000_THREAD_SAFE
boost::mutex mutex;
};
struct recv_packet_demuxer_proxy_3000 : transport::zero_copy_if
{
recv_packet_demuxer_proxy_3000(recv_packet_demuxer_3000::sptr demux, transport::zero_copy_if::sptr xport, const uint32_t sid):
_demux(demux), _xport(xport), _sid(sid)
{
_demux->realloc_sid(_sid); //causes clear
}
~recv_packet_demuxer_proxy_3000(void)
{
_demux->realloc_sid(_sid); //causes clear
}
size_t get_num_recv_frames(void) const {return _xport->get_num_recv_frames();}
size_t get_recv_frame_size(void) const {return _xport->get_recv_frame_size();}
transport::managed_recv_buffer::sptr get_recv_buff(double timeout)
{
return _demux->get_recv_buff(_sid, timeout);
}
size_t get_num_send_frames(void) const {return _xport->get_num_send_frames();}
size_t get_send_frame_size(void) const {return _xport->get_send_frame_size();}
transport::managed_send_buffer::sptr get_send_buff(double timeout)
{
return _xport->get_send_buff(timeout);
}
recv_packet_demuxer_3000::sptr _demux;
transport::zero_copy_if::sptr _xport;
const uint32_t _sid;
};
inline transport::zero_copy_if::sptr recv_packet_demuxer_3000::make_proxy(const uint32_t sid)
{
return transport::zero_copy_if::sptr(new recv_packet_demuxer_proxy_3000(this->shared_from_this(), _xport, sid));
}
}} //namespace uhd::usrp
#endif /* INCLUDED_LIBUHD_USRP_COMMON_RECV_PACKET_DEMUXER_3000_HPP */
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