keeps track of the number of requests waiting in the send buffer and adjusts bandwidht priority accordingly in the bandwidth limiter

include/libtorrent/bt_peer_connection.hpp

@@ -275,7 +275,7 @@ public:
 		// these functions encrypt the send buffer if m_rc4_encrypted
 		// is true, otherwise it passes the call to the
 		// peer_connection functions of the same names
-		void send_buffer(char* buf, int size);
+		void send_buffer(char* buf, int size, int flags = 0);
 		buffer::interval allocate_send_buffer(int size);
 		template <class Destructor>
 		void append_send_buffer(char* buffer, int size, Destructor const& destructor)

include/libtorrent/peer_connection.hpp

@@ -409,7 +409,8 @@ namespace libtorrent
 
 		// these functions are virtual to let bt_peer_connection hook into them
 		// and encrypt the content
-		virtual void send_buffer(char const* begin, int size);
+		enum message_type_flags { message_type_request = 1 };
+		virtual void send_buffer(char const* begin, int size, int flags = 0);
 		virtual buffer::interval allocate_send_buffer(int size);
 		virtual void setup_send();
 
@@ -681,6 +682,10 @@ namespace libtorrent
 		// downloaded from this peer
 		std::vector<int> m_suggested_pieces;
 
+		// a list of byte offsets inside the send buffer
+		// the piece requests
+		std::vector<int> m_requests_in_buffer;
+
 		// the number of pieces this peer
 		// has. Must be the same as
 		// std::count(m_have_piece.begin(),

include/libtorrent/peer_info.hpp

@@ -143,6 +143,10 @@ namespace libtorrent
 		// for yet
 		int download_queue_length;
 
+		// the number of request messages
+		// waiting to be sent inside the send buffer
+		int requests_in_buffer;
+
 		// the number of requests that is
 		// tried to be maintained (this is
 		// typically a function of download speed)