Imported Upstream version 2.1.3upstream/2.1.3

1 files changed, 196 insertions, 0 deletions

diff --git a/src/dist.cpp b/src/dist.cpp
new file mode 100644
index 0000000..e447bc1
--- /dev/null
+++ b/src/dist.cpp
@@ -0,0 +1,196 @@
+/*
+    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 ();
+}
+