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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/>.
*/
#include "../bindings/c/zmq.h"
#include "pub.hpp"
#include "err.hpp"
#include "msg_content.hpp"
#include "pipe.hpp"
zmq::pub_t::pub_t (class app_thread_t *parent_) :
socket_base_t (parent_)
{
options.requires_in = false;
options.requires_out = true;
}
zmq::pub_t::~pub_t ()
{
for (out_pipes_t::size_type i = 0; i != out_pipes.size (); i++)
out_pipes [i]->term ();
out_pipes.clear ();
}
void zmq::pub_t::xattach_pipes (class reader_t *inpipe_,
class writer_t *outpipe_)
{
zmq_assert (!inpipe_);
out_pipes.push_back (outpipe_);
}
void zmq::pub_t::xdetach_inpipe (class reader_t *pipe_)
{
zmq_assert (false);
}
void zmq::pub_t::xdetach_outpipe (class writer_t *pipe_)
{
out_pipes.erase (pipe_);
}
void zmq::pub_t::xkill (class reader_t *pipe_)
{
zmq_assert (false);
}
void zmq::pub_t::xrevive (class reader_t *pipe_)
{
zmq_assert (false);
}
int zmq::pub_t::xsetsockopt (int option_, const void *optval_,
size_t optvallen_)
{
errno = EINVAL;
return -1;
}
int zmq::pub_t::xsend (struct zmq_msg_t *msg_, int flags_)
{
out_pipes_t::size_type pipes_count = out_pipes.size ();
// If there are no pipes available, simply drop the message.
if (pipes_count == 0) {
int rc = zmq_msg_close (msg_);
zmq_assert (rc == 0);
rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return 0;
}
// First check whether all pipes are available for writing.
for (out_pipes_t::size_type i = 0; i != pipes_count; i++)
if (!out_pipes [i]->check_write (zmq_msg_size (msg_))) {
errno = EAGAIN;
return -1;
}
msg_content_t *content = (msg_content_t*) msg_->content;
// For VSMs the copying is straighforward.
if (content == (msg_content_t*) ZMQ_VSM) {
for (out_pipes_t::size_type i = 0; i != pipes_count; i++) {
out_pipes [i]->write (msg_);
if (!(flags_ & ZMQ_NOFLUSH))
out_pipes [i]->flush ();
}
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return 0;
}
// Optimisation for the case when there's only a single pipe
// to send the message to - no refcount adjustment i.e. no atomic
// operations are needed.
if (pipes_count == 1) {
out_pipes [0]->write (msg_);
if (!(flags_ & ZMQ_NOFLUSH))
out_pipes [0]->flush ();
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return 0;
}
// There are at least 2 destinations for the message. That means we have
// to deal with reference counting. First add N-1 references to
// the content (we are holding one reference anyway, that's why -1).
if (msg_->shared)
content->refcnt.add (pipes_count - 1);
else {
content->refcnt.set (pipes_count);
msg_->shared = true;
}
// Push the message to all destinations.
for (out_pipes_t::size_type i = 0; i != pipes_count; i++) {
out_pipes [i]->write (msg_);
if (!(flags_ & ZMQ_NOFLUSH))
out_pipes [i]->flush ();
}
// Detach the original message from the data buffer.
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return 0;
}
int zmq::pub_t::xflush ()
{
out_pipes_t::size_type pipe_count = out_pipes.size ();
for (out_pipes_t::size_type i = 0; i != pipe_count; i++)
out_pipes [i]->flush ();
return 0;
}
int zmq::pub_t::xrecv (struct zmq_msg_t *msg_, int flags_)
{
errno = ENOTSUP;
return -1;
}
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