From e645fc2693acc796304498909786b7b47005b429 Mon Sep 17 00:00:00 2001
From: Martin Lucina <martin@lucina.net>
Date: Mon, 23 Jan 2012 08:53:35 +0100
Subject: Imported Upstream version 2.1.3

---
 src/lb.cpp | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 67 insertions(+), 16 deletions(-)

(limited to 'src/lb.cpp')

diff --git a/src/lb.cpp b/src/lb.cpp
index ca93ba2..95af4a1 100644
--- a/src/lb.cpp
+++ b/src/lb.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    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 Lesser GNU General Public License as published by
+    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
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    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/>.
 */
 
@@ -22,42 +23,70 @@
 #include "lb.hpp"
 #include "pipe.hpp"
 #include "err.hpp"
+#include "own.hpp"
 
-zmq::lb_t::lb_t () :
+zmq::lb_t::lb_t (own_t *sink_) :
     active (0),
     current (0),
-    more (false)
+    more (false),
+    dropping (false),
+    sink (sink_),
+    terminating (false)
 {
 }
 
 zmq::lb_t::~lb_t ()
 {
-    for (pipes_t::size_type i = 0; i != pipes.size (); i++)
-        pipes [i]->term ();
+    zmq_assert (pipes.empty ());
 }
 
 void zmq::lb_t::attach (writer_t *pipe_)
 {
+    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::lb_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::lb_t::detach (writer_t *pipe_)
+void zmq::lb_t::terminated (writer_t *pipe_)
 {
-    zmq_assert (!more || pipes [current] != pipe_);
+    pipes_t::size_type index = pipes.index (pipe_);
+
+    //  If we are in the middle of multipart message and current pipe
+    //  have disconnected, we have to drop the remainder of the message.
+    if (index == current && more)
+        dropping = true;
 
     //  Remove the pipe from the list; adjust number of active pipes
     //  accordingly.
-    if (pipes.index (pipe_) < active) {
+    if (index < active) {
         active--;
         if (current == active)
             current = 0;
     }
     pipes.erase (pipe_);
+
+    if (terminating)
+        sink->unregister_term_ack ();
 }
 
-void zmq::lb_t::revive (writer_t *pipe_)
+void zmq::lb_t::activated (writer_t *pipe_)
 {
     //  Move the pipe to the list of active pipes.
     pipes.swap (pipes.index (pipe_), active);
@@ -66,6 +95,21 @@ void zmq::lb_t::revive (writer_t *pipe_)
 
 int zmq::lb_t::send (zmq_msg_t *msg_, int flags_)
 {
+    //  Drop the message if required. If we are at the end of the message
+    //  switch back to non-dropping mode.
+    if (dropping) {
+
+        more = msg_->flags & ZMQ_MSG_MORE;
+        if (!more)
+            dropping = false;
+
+        int rc = zmq_msg_close (msg_);
+        errno_assert (rc == 0);
+        rc = zmq_msg_init (msg_);
+        zmq_assert (rc == 0);
+        return 0;
+    }
+
     while (active > 0) {
         if (pipes [current]->write (msg_)) {
             more = msg_->flags & ZMQ_MSG_MORE;
@@ -108,13 +152,20 @@ bool zmq::lb_t::has_out ()
         return true;
 
     while (active > 0) {
-        if (pipes [current]->check_write ())
+
+        //  Check whether zero-sized message can be written to the pipe.
+        zmq_msg_t msg;
+        zmq_msg_init (&msg);
+        if (pipes [current]->check_write (&msg)) {
+            zmq_msg_close (&msg);
             return true;
+        }
+        zmq_msg_close (&msg);
 
+        //  Deactivate the pipe.
         active--;
-        if (current < active)
-            pipes.swap (current, active);
-        else
+        pipes.swap (current, active);
+        if (current == active)
             current = 0;
     }
 
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