From edfd05df8ef58afc498795cb74906c07ee396f76 Mon Sep 17 00:00:00 2001
From: Jon Dyte <jon@totient.co.uk>
Date: Wed, 7 Apr 2010 08:20:01 +0200
Subject: devices can be created via API

---
 src/queue.cpp | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 src/queue.cpp

(limited to 'src/queue.cpp')

diff --git a/src/queue.cpp b/src/queue.cpp
new file mode 100644
index 0000000..361df78
--- /dev/null
+++ b/src/queue.cpp
@@ -0,0 +1,98 @@
+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    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 "../include/zmq.h"
+
+#include "queue.hpp"
+#include "socket_base.hpp"
+#include "err.hpp"
+
+int zmq::queue (class socket_base_t *insocket_,
+        class socket_base_t *outsocket_)
+{
+    zmq_msg_t request_msg;
+    int rc = zmq_msg_init (&request_msg);
+    errno_assert (rc == 0);
+    bool has_request = false;
+
+    zmq_msg_t response_msg;
+    rc = zmq_msg_init (&response_msg);
+    errno_assert (rc == 0);
+    bool has_response = false;
+
+    zmq_pollitem_t items [2];
+    items [0].socket = insocket_;
+    items [0].fd = 0;
+    items [0].events = ZMQ_POLLIN;
+    items [0].revents = 0;
+    items [1].socket = outsocket_;
+    items [1].fd = 0;
+    items [1].events = ZMQ_POLLIN;
+    items [1].revents = 0;
+
+    while (true) {
+        rc = zmq_poll (&items [0], 2, -1);
+        errno_assert (rc > 0);
+
+        //  The algorithm below asumes ratio of request and replies processed
+        //  under full load to be 1:1. The alternative would be to process
+        //  replies first, handle request only when there are no more replies.
+
+        //  Receive a new request.
+        if (items [0].revents & ZMQ_POLLIN) {
+            zmq_assert (!has_request);
+            rc = insocket_->recv (&request_msg, ZMQ_NOBLOCK);
+            errno_assert (rc == 0);
+            items [0].events &= ~ZMQ_POLLIN;
+            items [1].events |= ZMQ_POLLOUT;
+            has_request = true;
+        }
+
+        //  Send the request further.
+        if (items [1].revents & ZMQ_POLLOUT) {
+            zmq_assert (has_request);
+            rc = outsocket_->send (&request_msg, ZMQ_NOBLOCK);
+            errno_assert (rc == 0);
+            items [0].events |= ZMQ_POLLIN;
+            items [1].events &= ~ZMQ_POLLOUT;
+            has_request = false;
+        }
+
+        //  Get a new reply.
+        if (items [1].revents & ZMQ_POLLIN) {
+            zmq_assert (!has_response);
+            rc = outsocket_->recv (&response_msg, ZMQ_NOBLOCK);
+            errno_assert (rc == 0);
+            items [0].events |= ZMQ_POLLOUT;
+            items [1].events &= ~ZMQ_POLLIN;
+            has_response = true;
+        }
+
+        //  Send the reply further.
+        if (items [0].revents & ZMQ_POLLOUT) {\
+            zmq_assert (has_response);
+            rc = insocket_->send (&response_msg, ZMQ_NOBLOCK);
+            errno_assert (rc == 0);
+            items [0].events &= ~ZMQ_POLLOUT;
+            items [1].events |= ZMQ_POLLIN;
+            has_response = false;
+        }
+    }
+}
+
-- 
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