Merge branch 'work'

1 files changed, 72 insertions, 64 deletions

diff --git a/host/lib/transport/udp_zero_copy_asio.cpp b/host/lib/transport/udp_zero_copy_asio.cpp
index ee44803f4..56ba391d3 100644
--- a/host/lib/transport/udp_zero_copy_asio.cpp
+++ b/host/lib/transport/udp_zero_copy_asio.cpp
@@ -16,9 +16,9 @@
 //
 
 #include <uhd/transport/udp_zero_copy.hpp>
+#include <uhd/utils/assert.hpp>
 #include <boost/cstdint.hpp>
 #include <boost/asio.hpp>
-#include <boost/thread.hpp>
 #include <boost/format.hpp>
 #include <iostream>
 
@@ -26,65 +26,56 @@ 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;
+        /* NOP */
     }
 
     ~managed_recv_buffer_impl(void){
-        if (not _done) this->done();
+        /* NOP */
     }
 
     void done(void){
-        _done = true;
-        delete [] boost::asio::buffer_cast<const boost::uint32_t *>(_buff);
+        /* NOP */
     }
 
 private:
-    const boost::asio::const_buffer &get(void){
+    const boost::asio::const_buffer &get(void) const{
         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;
+    ) : _buff(buff), _socket(socket){
+        /* NOP */
     }
 
     ~managed_send_buffer_impl(void){
-        if (not _done) this->done(0);
+        /* NOP */
     }
 
     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;
+        _socket->send(boost::asio::buffer(_buff, num_bytes));
     }
 
 private:
-    const boost::asio::mutable_buffer &get(void){
+    const boost::asio::mutable_buffer &get(void) const{
         return _buff;
     }
 
     const boost::asio::mutable_buffer _buff;
     boost::asio::ip::udp::socket      *_socket;
-    bool _done;
 };
 
 /***********************************************************************
@@ -94,8 +85,12 @@ private:
  *   However, it is not a true zero copy implementation as each
  *   send and recv requires a copy operation to/from userspace.
  **********************************************************************/
+static const size_t max_buff_size = 2000; //assume max size on send and recv
+
 class udp_zero_copy_impl : public udp_zero_copy{
 public:
+    typedef boost::shared_ptr<udp_zero_copy_impl> sptr;
+
     //structors
     udp_zero_copy_impl(const std::string &addr, const std::string &port);
     ~udp_zero_copy_impl(void);
@@ -104,23 +99,27 @@ public:
     managed_recv_buffer::sptr get_recv_buff(void);
     managed_send_buffer::sptr get_send_buff(void);
 
-    //resize
-    size_t resize_recv_buff(size_t num_bytes){
-        boost::asio::socket_base::receive_buffer_size option(num_bytes);
-        _socket->set_option(option);
+    //manage buffer
+    template <typename Opt> size_t get_buff_size(void){
+        Opt option;
         _socket->get_option(option);
         return option.value();
     }
-    size_t resize_send_buff(size_t num_bytes){
-        boost::asio::socket_base::send_buffer_size option(num_bytes);
+
+    template <typename Opt> size_t resize_buff(size_t num_bytes){
+        Opt option(num_bytes);
         _socket->set_option(option);
-        _socket->get_option(option);
-        return option.value();
+        return get_buff_size<Opt>();
     }
 
 private:
     boost::asio::ip::udp::socket   *_socket;
     boost::asio::io_service        _io_service;
+
+    //send and recv buffer memory (allocated once)
+    boost::uint8_t _send_mem[max_buff_size], _recv_mem[max_buff_size];
+
+    managed_send_buffer::sptr _send_buff;
 };
 
 udp_zero_copy_impl::udp_zero_copy_impl(const std::string &addr, const std::string &port){
@@ -131,10 +130,25 @@ udp_zero_copy_impl::udp_zero_copy_impl(const std::string &addr, const std::strin
     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
+    // 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);
+
+    // create the managed send buff (just once)
+    _send_buff = managed_send_buffer::sptr(new managed_send_buffer_impl(
+        boost::asio::buffer(_send_mem, max_buff_size), _socket
+    ));
+
+    // set recv timeout
+    timeval tv;
+    tv.tv_sec = 0;
+    tv.tv_usec = 100*1000; //100 ms
+    UHD_ASSERT_THROW(setsockopt(
+        _socket->native(),
+        SOL_SOCKET, SO_RCVTIMEO,
+        (const char *)&tv, sizeof(timeval)
+    ) == 0);
 }
 
 udp_zero_copy_impl::~udp_zero_copy_impl(void){
@@ -142,61 +156,55 @@ udp_zero_copy_impl::~udp_zero_copy_impl(void){
 }
 
 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));
-    }
+    //call recv() with timeout option
+    size_t num_bytes = _socket->receive(boost::asio::buffer(_recv_mem, max_buff_size));
 
     //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))
+        new managed_recv_buffer_impl(boost::asio::buffer(_recv_mem, num_bytes))
     );
 }
 
 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)
-    );
+    return _send_buff;
 }
 
 /***********************************************************************
  * UDP zero copy make function
  **********************************************************************/
+template<typename Opt> static inline void resize_buff_helper(
+    udp_zero_copy_impl::sptr udp_trans,
+    size_t target_size,
+    const std::string &name
+){
+    static const size_t min_buff_size = size_t(100e3);
+
+    //resize the buffer if size was provided
+    if (target_size > 0){
+        size_t actual_size = udp_trans->resize_buff<Opt>(target_size);
+        if (target_size != actual_size) std::cout << boost::format(
+            "Target %s buffer size: %d\n"
+            "Actual %s byffer size: %d"
+        ) % name % target_size % name % actual_size << std::endl;
+    }
+
+    //otherwise, ensure that the buffer is at least the minimum size
+    else if (udp_trans->get_buff_size<Opt>() < min_buff_size){
+        resize_buff_helper<Opt>(udp_trans, min_buff_size, name);
+    }
+}
+
 udp_zero_copy::sptr udp_zero_copy::make(
     const std::string &addr,
     const std::string &port,
     size_t recv_buff_size,
     size_t send_buff_size
 ){
-    boost::shared_ptr<udp_zero_copy_impl> udp_trans(new udp_zero_copy_impl(addr, port));
-
-    //resize the recv buffer if size was provided
-    if (recv_buff_size > 0){
-        size_t actual_bytes = udp_trans->resize_recv_buff(recv_buff_size);
-        if (recv_buff_size != actual_bytes) std::cout << boost::format(
-            "Target recv buffer size: %d\n"
-            "Actual recv byffer size: %d"
-        ) % recv_buff_size % actual_bytes << std::endl;
-    }
+    udp_zero_copy_impl::sptr udp_trans(new udp_zero_copy_impl(addr, port));
 
-    //resize the send buffer if size was provided
-    if (send_buff_size > 0){
-        size_t actual_bytes = udp_trans->resize_send_buff(send_buff_size);
-        if (send_buff_size != actual_bytes) std::cout << boost::format(
-            "Target send buffer size: %d\n"
-            "Actual send byffer size: %d"
-        ) % send_buff_size % actual_bytes << std::endl;
-    }
+    //call the helper to resize send and recv buffers
+    resize_buff_helper<boost::asio::socket_base::receive_buffer_size>(udp_trans, recv_buff_size, "recv");
+    resize_buff_helper<boost::asio::socket_base::send_buffer_size>   (udp_trans, send_buff_size, "send");
 
     return udp_trans;
 }