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authorMartin Lucina <martin@lucina.net>2012-01-23 08:53:35 +0100
committerMartin Lucina <martin@lucina.net>2012-01-23 08:53:35 +0100
commite645fc2693acc796304498909786b7b47005b429 (patch)
tree4118cd4c7b9eba3ba1d6892800c79669ea94c4e9 /src/dist.cpp
parent2c416a793ea781273a5da6742211f5f01af13a2b (diff)
Imported Upstream version 2.1.3upstream/2.1.3
Diffstat (limited to 'src/dist.cpp')
-rw-r--r--src/dist.cpp196
1 files changed, 196 insertions, 0 deletions
diff --git a/src/dist.cpp b/src/dist.cpp
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+/*
+ Copyright (c) 2007-2011 iMatix Corporation
+ Copyright (c) 2007-2011 Other 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/>.
+*/
+
+#include "../include/zmq.h"
+
+#include "dist.hpp"
+#include "pipe.hpp"
+#include "err.hpp"
+#include "own.hpp"
+#include "msg_content.hpp"
+
+zmq::dist_t::dist_t (own_t *sink_) :
+ active (0),
+ more (false),
+ sink (sink_),
+ terminating (false)
+{
+}
+
+zmq::dist_t::~dist_t ()
+{
+ zmq_assert (pipes.empty ());
+}
+
+void zmq::dist_t::attach (writer_t *pipe_)
+{
+ // If we are in the middle of sending a message, let's postpone plugging
+ // in the pipe.
+ if (!terminating && more) {
+ new_pipes.push_back (pipe_);
+ return;
+ }
+
+ pipe_->set_event_sink (this);
+
+ pipes.push_back (pipe_);
+ pipes.swap (active, pipes.size () - 1);
+ active++;
+
+ if (terminating) {
+ sink->register_term_acks (1);
+ pipe_->terminate ();
+ }
+}
+
+void zmq::dist_t::terminate ()
+{
+ zmq_assert (!terminating);
+ terminating = true;
+
+ sink->register_term_acks (pipes.size ());
+ for (pipes_t::size_type i = 0; i != pipes.size (); i++)
+ pipes [i]->terminate ();
+}
+
+void zmq::dist_t::terminated (writer_t *pipe_)
+{
+ // Remove the pipe from the list; adjust number of active pipes
+ // accordingly.
+ if (pipes.index (pipe_) < active)
+ active--;
+ pipes.erase (pipe_);
+
+ if (terminating)
+ sink->unregister_term_ack ();
+}
+
+void zmq::dist_t::activated (writer_t *pipe_)
+{
+ // Move the pipe to the list of active pipes.
+ pipes.swap (pipes.index (pipe_), active);
+ active++;
+}
+
+int zmq::dist_t::send (zmq_msg_t *msg_, int flags_)
+{
+ // Is this end of a multipart message?
+ bool msg_more = msg_->flags & ZMQ_MSG_MORE;
+
+ // Push the message to active pipes.
+ distribute (msg_, flags_);
+
+ // If mutlipart message is fully sent, activate new pipes.
+ if (more && !msg_more)
+ clear_new_pipes ();
+
+ more = msg_more;
+
+ return 0;
+}
+
+void zmq::dist_t::distribute (zmq_msg_t *msg_, int flags_)
+{
+ // If there are no active pipes available, simply drop the message.
+ if (active == 0) {
+ int rc = zmq_msg_close (msg_);
+ zmq_assert (rc == 0);
+ rc = zmq_msg_init (msg_);
+ zmq_assert (rc == 0);
+ return;
+ }
+
+ msg_content_t *content = (msg_content_t*) msg_->content;
+
+ // For VSMs the copying is straighforward.
+ if (content == (msg_content_t*) ZMQ_VSM) {
+ for (pipes_t::size_type i = 0; i < active;)
+ if (write (pipes [i], msg_))
+ i++;
+ int rc = zmq_msg_init (msg_);
+ zmq_assert (rc == 0);
+ return;
+ }
+
+ // 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 (active == 1) {
+ if (!write (pipes [0], msg_)) {
+ int rc = zmq_msg_close (msg_);
+ zmq_assert (rc == 0);
+ }
+ int rc = zmq_msg_init (msg_);
+ zmq_assert (rc == 0);
+ return;
+ }
+
+ // 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_->flags & ZMQ_MSG_SHARED)
+ content->refcnt.add (active - 1);
+ else {
+ content->refcnt.set (active);
+ msg_->flags |= ZMQ_MSG_SHARED;
+ }
+
+ // Push the message to all destinations.
+ for (pipes_t::size_type i = 0; i < active;) {
+ if (!write (pipes [i], msg_))
+ content->refcnt.sub (1);
+ else
+ i++;
+ }
+
+ // Detach the original message from the data buffer.
+ int rc = zmq_msg_init (msg_);
+ zmq_assert (rc == 0);
+}
+
+bool zmq::dist_t::has_out ()
+{
+ return true;
+}
+
+bool zmq::dist_t::write (class writer_t *pipe_, zmq_msg_t *msg_)
+{
+ if (!pipe_->write (msg_)) {
+ active--;
+ pipes.swap (pipes.index (pipe_), active);
+ return false;
+ }
+ if (!(msg_->flags & ZMQ_MSG_MORE))
+ pipe_->flush ();
+ return true;
+}
+
+void zmq::dist_t::clear_new_pipes ()
+{
+ for (new_pipes_t::iterator it = new_pipes.begin (); it != new_pipes.end ();
+ ++it) {
+ (*it)->set_event_sink (this);
+ pipes.push_back (*it);
+ pipes.swap (active, pipes.size () - 1);
+ active++;
+ }
+ new_pipes.clear ();
+}
+