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diff --git a/src/req.hpp b/src/req.hpp
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+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_REQ_HPP_INCLUDED__
+#define __ZMQ_REQ_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "yarray.hpp"
+
+namespace zmq
+{
+
+    class req_t : public socket_base_t
+    {
+    public:
+
+        req_t (class app_thread_t *parent_);
+        ~req_t ();
+
+        //  Overloads of functions from socket_base_t.
+        void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
+            const blob_t &peer_identity_);
+        void xdetach_inpipe (class reader_t *pipe_);
+        void xdetach_outpipe (class writer_t *pipe_);
+        void xkill (class reader_t *pipe_);
+        void xrevive (class reader_t *pipe_);
+        void xrevive (class writer_t *pipe_);
+        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
+        int xsend (zmq_msg_t *msg_, int flags_);
+        int xrecv (zmq_msg_t *msg_, int flags_);
+        bool xhas_in ();
+        bool xhas_out ();
+
+    private:
+
+        //  List in outbound and inbound pipes. Note that the two lists are
+        //  always in sync. I.e. outpipe with index N communicates with the
+        //  same session as inpipe with index N.
+        //
+        //  TODO: Once we have queue limits in place, list of active outpipes
+        //  is to be held (presumably by stacking active outpipes at
+        //  the beginning of the array). We don't have to do the same thing for
+        //  inpipes, because we know which pipe we want to read the
+        //  reply from.
+        typedef yarray_t <class writer_t> out_pipes_t;
+        out_pipes_t out_pipes;
+        typedef yarray_t <class reader_t> in_pipes_t;
+        in_pipes_t in_pipes;
+
+        //  Number of active pipes.
+        size_t active;
+
+        //  Req_t load-balances the requests - 'current' points to the session
+        //  that's processing the request at the moment.
+        out_pipes_t::size_type current;
+
+        //  If true, request was already sent and reply wasn't received yet or
+        //  was raceived partially.
+        bool receiving_reply;
+
+        //  True, if read can be attempted from the reply pipe.
+        bool reply_pipe_active;
+
+        //  True, if message processed at the moment (either sent or received)
+        //  is processed only partially.
+        bool more;
+
+        //  Pipe we are awaiting the reply from.
+        class reader_t *reply_pipe;
+
+        req_t (const req_t&);
+        void operator = (const req_t&);
+    };
+
+}
+
+#endif