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diff --git a/src/pipe.hpp b/src/pipe.hpp
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+++ b/src/pipe.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_PIPE_HPP_INCLUDED__
+#define __ZMQ_PIPE_HPP_INCLUDED__
+
+#include "../include/zmq.h"
+
+#include "stdint.hpp"
+#include "i_endpoint.hpp"
+#include "yarray_item.hpp"
+#include "ypipe.hpp"
+#include "config.hpp"
+#include "object.hpp"
+
+namespace zmq
+{
+
+    class reader_t : public object_t, public yarray_item_t
+    {
+    public:
+
+        reader_t (class object_t *parent_,
+            uint64_t hwm_, uint64_t lwm_);
+        ~reader_t ();
+
+        void set_pipe (class pipe_t *pipe_);
+        void set_endpoint (i_endpoint *endpoint_);
+
+        //  Returns true if there is at least one message to read in the pipe.
+        bool check_read ();
+
+        //  Reads a message to the underlying pipe.
+        bool read (zmq_msg_t *msg_);
+
+        //  Ask pipe to terminate.
+        void term ();
+
+    private:
+
+        //  Command handlers.
+        void process_revive ();
+        void process_pipe_term_ack ();
+
+        //  The underlying pipe.
+        class pipe_t *pipe;
+
+        //  Pipe writer associated with the other side of the pipe.
+        class writer_t *peer;
+
+        //  High and low watermarks for in-memory storage (in bytes).
+        uint64_t hwm;
+        uint64_t lwm;
+
+        //  Number of messages read so far.
+        uint64_t msgs_read;
+
+        //  Endpoint (either session or socket) the pipe is attached to.
+        i_endpoint *endpoint;
+
+        reader_t (const reader_t&);
+        void operator = (const reader_t&);
+    };
+
+    class writer_t : public object_t, public yarray_item_t
+    {
+    public:
+
+        writer_t (class object_t *parent_,
+            uint64_t hwm_, uint64_t lwm_);
+        ~writer_t ();
+
+        void set_pipe (class pipe_t *pipe_);
+        void set_endpoint (i_endpoint *endpoint_);
+
+        //  Checks whether a message can be written to the pipe.
+        //  If writing the message would cause high watermark to be
+        //  exceeded, the function returns false.
+        bool check_write ();
+
+        //  Writes a message to the underlying pipe. Returns false if the
+        //  message cannot be written because high watermark was reached.
+        bool write (zmq_msg_t *msg_);
+
+        //  Remove unfinished part of a message from the pipe.
+        void rollback ();
+
+        //  Flush the messages downsteam.
+        void flush ();
+
+        //  Ask pipe to terminate.
+        void term ();
+
+    private:
+
+        void process_reader_info (uint64_t msgs_read_);
+
+        //  Command handlers.
+        void process_pipe_term ();
+
+        //  Tests whether the pipe is already full.
+        bool pipe_full ();
+
+        //  The underlying pipe.
+        class pipe_t *pipe;
+
+        //  Pipe reader associated with the other side of the pipe.
+        class reader_t *peer;
+
+        //  High and low watermarks for in-memory storage (in bytes).
+        uint64_t hwm;
+        uint64_t lwm;
+
+        //  Last confirmed number of messages read from the pipe.
+        //  The actual number can be higher.
+        uint64_t msgs_read;
+
+        //  Number of messages we have written so far.
+        uint64_t msgs_written;
+
+        //  True iff the last attempt to write a message has failed.
+        bool stalled;
+
+        //  Endpoint (either session or socket) the pipe is attached to.
+        i_endpoint *endpoint;
+
+        writer_t (const writer_t&);
+        void operator = (const writer_t&);
+    };
+
+    //  Message pipe.
+    class pipe_t : public ypipe_t <zmq_msg_t, message_pipe_granularity>
+    {
+    public:
+
+        pipe_t (object_t *reader_parent_, object_t *writer_parent_,
+            uint64_t hwm_);
+        ~pipe_t ();
+
+        reader_t reader;
+        writer_t writer;
+
+    private:
+
+        uint64_t compute_lwm (uint64_t hwm_);
+
+        pipe_t (const pipe_t&);
+        void operator = (const pipe_t&);
+    };
+
+}
+
+#endif