1 files changed, 68 insertions, 0 deletions
diff --git a/src/safe_object.hpp b/src/safe_object.hpp
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+++ b/src/safe_object.hpp
@@ -0,0 +1,68 @@
+/*
+    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 __ZS_SAFE_OBJECT_HPP_INCLUDED__
+#define __ZS_SAFE_OBJECT_HPP_INCLUDED__
+
+#include "object.hpp"
+#include "atomic_counter.hpp"	
+
+namespace zs
+{
+
+    //  Same as object_t with the exception of termination mechanism. While
+    //  object_t is destroyed immediately on terminate (assuming that the caller
+    //  have ensured that there are no more commands for the object on the
+    //  fly), safe_object_t switches into termination mode and waits for all
+    //  the on-the-fly commands to be delivered before it deallocates itself.
+
+    class safe_object_t : public object_t
+    {
+    public:
+
+        safe_object_t (class dispatcher_t *dispatcher_, int thread_slot_);
+        safe_object_t (object_t *parent_);
+
+        void inc_seqnum ();
+        void process_command (struct command_t &cmd_);
+
+    protected:
+
+        void terminate ();
+        bool is_terminating ();
+
+        virtual ~safe_object_t ();
+
+    private:
+
+        //  Sequence number of the last command sent to the object and last
+        //  command processed by the object. The former is an atomic counter
+        //  meaning that other threads can increment it safely.
+        atomic_counter_t sent_seqnum;
+        uint32_t processed_seqnum;
+
+        bool terminating;
+
+        safe_object_t (const safe_object_t&);
+        void operator = (const safe_object_t&);
+    };
+
+}
+
+#endif