lockfree interaction patter for 3 theads implemented

src/io_object.hpp

@@ -0,0 +1,62 @@
+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    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_IO_OBJECT_HPP_INCLUDED__
+#define __ZMQ_IO_OBJECT_HPP_INCLUDED__
+
+#include "object.hpp"
+
+namespace zmq
+{
+
+    class io_object_t : public object_t
+    {
+    public:
+
+        //  I/O object will live in the thread inherited from the parent.
+        //  However, it's lifetime is managed by the owner.
+        io_object_t (object_t *parent_, object_t *owner_);
+
+    protected:
+
+        //  Ask owner socket to terminate this I/O object. This may not happen
+        void term ();
+
+        //  I/O object destroys itself. No point in allowing others to invoke
+        //  the destructor. At the same time, it has to be virtual so that
+        //  generic io_object deallocation mechanism destroys specific type
+        //  of I/O object correctly.
+        virtual ~io_object_t ();
+
+    private:
+
+        //  Handlers for incoming commands.
+        void process_term ();
+
+        //  Socket owning this I/O object. It is responsible for destroying
+        //  it when it's being closed.
+        object_t *owner;
+
+        io_object_t (const io_object_t&);
+        void operator = (const io_object_t&);
+    };
+
+}
+
+#endif