From 4322666dc134998c1420ee00c6e01eddc207e5b4 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Mon, 15 Jul 2013 15:19:58 -0700
Subject: b100: switch to new packet demuxer

---
 host/lib/usrp/common/recv_packet_demuxer_3000.hpp | 114 ++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 host/lib/usrp/common/recv_packet_demuxer_3000.hpp

(limited to 'host/lib/usrp/common')

diff --git a/host/lib/usrp/common/recv_packet_demuxer_3000.hpp b/host/lib/usrp/common/recv_packet_demuxer_3000.hpp
new file mode 100644
index 000000000..d4c899f1c
--- /dev/null
+++ b/host/lib/usrp/common/recv_packet_demuxer_3000.hpp
@@ -0,0 +1,114 @@
+//
+// 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 <boost/cstdint.hpp>
+#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>
+
+namespace uhd{ namespace usrp{
+
+    struct recv_packet_demuxer_3000
+    {
+        recv_packet_demuxer_3000(transport::zero_copy_if::sptr xport):
+            _xport(xport)
+        {/*NOP*/}
+
+        transport::managed_recv_buffer::sptr get_recv_buff(const boost::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 boost::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.pop();
+                    return buff;
+                }
+            }
+
+            //----------------------------------------------------------
+            //-- 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
+            {
+                buff = _xport->get_recv_buff(timeout);
+                if (buff)
+                {
+                    const boost::uint32_t new_sid = uhd::wtohx(buff->cast<const boost::uint32_t *>()[1]);
+                    if (new_sid != sid)
+                    {
+                        boost::mutex::scoped_lock l(mutex);
+                        _queues[new_sid].push(buff);
+                        buff.reset();
+                    }
+                }
+                _claimed.write(0);
+                cond.notify_all();
+            }
+            return buff;
+        }
+
+        typedef std::queue<transport::managed_recv_buffer::sptr> queue_type_t;
+        std::map<boost::uint32_t, queue_type_t> _queues;
+        transport::zero_copy_if::sptr _xport;
+        uhd::atomic_uint32_t _claimed;
+        boost::condition_variable cond;
+        boost::mutex mutex;
+    };
+
+}} //namespace uhd::usrp
+
+#endif /* INCLUDED_LIBUHD_USRP_COMMON_RECV_PACKET_DEMUXER_3000_HPP */
-- 
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