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/*
Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ZMQ_COMMAND_HPP_INCLUDED__
#define __ZMQ_COMMAND_HPP_INCLUDED__
#include "stdint.hpp"
namespace zmq
{
class object_t;
class own_t;
struct i_engine;
class pipe_t;
class socket_base_t;
// This structure defines the commands that can be sent between threads.
struct command_t
{
// Object to process the command.
zmq::object_t *destination;
enum type_t
{
stop,
plug,
own,
attach,
bind,
activate_read,
activate_write,
hiccup,
pipe_term,
pipe_term_ack,
term_req,
term,
term_ack,
reap,
reaped,
inproc_connected,
done
} type;
union {
// Sent to I/O thread to let it know that it should
// terminate itself.
struct {
} stop;
// Sent to I/O object to make it register with its I/O thread.
struct {
} plug;
// Sent to socket to let it know about the newly created object.
struct {
zmq::own_t *object;
} own;
// Attach the engine to the session. If engine is NULL, it informs
// session that the connection have failed.
struct {
struct i_engine *engine;
} attach;
// Sent from session to socket to establish pipe(s) between them.
// Caller have used inc_seqnum beforehand sending the command.
struct {
zmq::pipe_t *pipe;
} bind;
// Sent by pipe writer to inform dormant pipe reader that there
// are messages in the pipe.
struct {
} activate_read;
// Sent by pipe reader to inform pipe writer about how many
// messages it has read so far.
struct {
uint64_t msgs_read;
} activate_write;
// Sent by pipe reader to writer after creating a new inpipe.
// The parameter is actually of type pipe_t::upipe_t, however,
// its definition is private so we'll have to do with void*.
struct {
void *pipe;
} hiccup;
// Sent by pipe reader to pipe writer to ask it to terminate
// its end of the pipe.
struct {
} pipe_term;
// Pipe writer acknowledges pipe_term command.
struct {
} pipe_term_ack;
// Sent by I/O object ot the socket to request the shutdown of
// the I/O object.
struct {
zmq::own_t *object;
} term_req;
// Sent by socket to I/O object to start its shutdown.
struct {
int linger;
} term;
// Sent by I/O object to the socket to acknowledge it has
// shut down.
struct {
} term_ack;
// Transfers the ownership of the closed socket
// to the reaper thread.
struct {
zmq::socket_base_t *socket;
} reap;
// Closed socket notifies the reaper that it's already deallocated.
struct {
} reaped;
// Sent by reaper thread to the term thread when all the sockets
// are successfully deallocated.
struct {
} done;
} args;
};
}
#endif
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