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/*
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
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