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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_OWNED_HPP_INCLUDED__
+#define __ZMQ_OWNED_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "atomic_counter.hpp"
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    //  Base class for objects owned by individual sockets. Handles
+    //  initialisation and destruction of such objects.
+
+    class owned_t : public object_t
+    {
+    public:
+
+        //  The object will live in parent's thread, however, its lifetime
+        //  will be managed by its owner socket.
+        owned_t (object_t *parent_, socket_base_t *owner_);
+
+        //  When another owned object wants to send command to this object
+        //  it calls this function to let it know it should not shut down
+        //  before the command is delivered.
+        void inc_seqnum ();
+
+    protected:
+
+        //  Ask owner socket to terminate this object.
+        void term ();
+
+        //  Derived object destroys owned_t. No point in allowing others to
+        //  invoke the destructor. At the same time, it has to be virtual so
+        //  that generic owned_t deallocation mechanism destroys specific type
+        //  of the owned object correctly.
+        virtual ~owned_t ();
+
+        //  io_object_t defines a new handler used to disconnect the object
+        //  from the poller object. Implement the handlen in the derived
+        //  classes to ensure sane cleanup.
+        virtual void process_unplug () = 0;
+
+        //  Socket owning this object. When the socket is being closed it's
+        //  responsible for shutting down this object.
+        socket_base_t *owner;
+
+    private:
+
+        //  Handlers for incoming commands.
+        void process_term ();
+        void process_seqnum ();
+
+        void finalise ();
+
+        //  Sequence number of the last command sent to this object.
+        atomic_counter_t sent_seqnum;
+
+        //  Sequence number of the last command processed by this object.
+        uint64_t processed_seqnum;
+
+        //  If true, the object is already shutting down.
+        bool shutting_down;
+
+        owned_t (const owned_t&);
+        void operator = (const owned_t&);
+    };
+
+}
+
+#endif