diff options
Diffstat (limited to 'doc/zmq_socket.html')
| -rw-r--r-- | doc/zmq_socket.html | 1403 |
1 files changed, 0 insertions, 1403 deletions
diff --git a/doc/zmq_socket.html b/doc/zmq_socket.html deleted file mode 100644 index 50f5844..0000000 --- a/doc/zmq_socket.html +++ /dev/null @@ -1,1403 +0,0 @@ -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
- "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
-<head>
-<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
-<meta name="generator" content="AsciiDoc 8.5.2" />
-<title>zmq_socket(3)</title>
-<style type="text/css">
-/* Debug borders */
-p, li, dt, dd, div, pre, h1, h2, h3, h4, h5, h6 {
-/*
- border: 1px solid red;
-*/
-}
-
-body {
- margin: 1em 5% 1em 5%;
-}
-
-a {
- color: blue;
- text-decoration: underline;
-}
-a:visited {
- color: fuchsia;
-}
-
-em {
- font-style: italic;
- color: navy;
-}
-
-strong {
- font-weight: bold;
- color: #083194;
-}
-
-tt {
- color: navy;
-}
-
-h1, h2, h3, h4, h5, h6 {
- color: #527bbd;
- font-family: sans-serif;
- margin-top: 1.2em;
- margin-bottom: 0.5em;
- line-height: 1.3;
-}
-
-h1, h2, h3 {
- border-bottom: 2px solid silver;
-}
-h2 {
- padding-top: 0.5em;
-}
-h3 {
- float: left;
-}
-h3 + * {
- clear: left;
-}
-
-div.sectionbody {
- font-family: serif;
- margin-left: 0;
-}
-
-hr {
- border: 1px solid silver;
-}
-
-p {
- margin-top: 0.5em;
- margin-bottom: 0.5em;
-}
-
-ul, ol, li > p {
- margin-top: 0;
-}
-
-pre {
- padding: 0;
- margin: 0;
-}
-
-span#author {
- color: #527bbd;
- font-family: sans-serif;
- font-weight: bold;
- font-size: 1.1em;
-}
-span#email {
-}
-span#revnumber, span#revdate, span#revremark {
- font-family: sans-serif;
-}
-
-div#footer {
- font-family: sans-serif;
- font-size: small;
- border-top: 2px solid silver;
- padding-top: 0.5em;
- margin-top: 4.0em;
-}
-div#footer-text {
- float: left;
- padding-bottom: 0.5em;
-}
-div#footer-badges {
- float: right;
- padding-bottom: 0.5em;
-}
-
-div#preamble {
- margin-top: 1.5em;
- margin-bottom: 1.5em;
-}
-div.tableblock, div.imageblock, div.exampleblock, div.verseblock,
-div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
-div.admonitionblock {
- margin-top: 1.0em;
- margin-bottom: 1.5em;
-}
-div.admonitionblock {
- margin-top: 2.0em;
- margin-bottom: 2.0em;
- margin-right: 10%;
- color: #606060;
-}
-
-div.content { /* Block element content. */
- padding: 0;
-}
-
-/* Block element titles. */
-div.title, caption.title {
- color: #527bbd;
- font-family: sans-serif;
- font-weight: bold;
- text-align: left;
- margin-top: 1.0em;
- margin-bottom: 0.5em;
-}
-div.title + * {
- margin-top: 0;
-}
-
-td div.title:first-child {
- margin-top: 0.0em;
-}
-div.content div.title:first-child {
- margin-top: 0.0em;
-}
-div.content + div.title {
- margin-top: 0.0em;
-}
-
-div.sidebarblock > div.content {
- background: #ffffee;
- border: 1px solid silver;
- padding: 0.5em;
-}
-
-div.listingblock > div.content {
- border: 1px solid silver;
- background: #f4f4f4;
- padding: 0.5em;
-}
-
-div.quoteblock, div.verseblock {
- padding-left: 1.0em;
- margin-left: 1.0em;
- margin-right: 10%;
- border-left: 5px solid #dddddd;
- color: #777777;
-}
-
-div.quoteblock > div.attribution {
- padding-top: 0.5em;
- text-align: right;
-}
-
-div.verseblock > div.content {
- white-space: pre;
-}
-div.verseblock > div.attribution {
- padding-top: 0.75em;
- text-align: left;
-}
-/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
-div.verseblock + div.attribution {
- text-align: left;
-}
-
-div.admonitionblock .icon {
- vertical-align: top;
- font-size: 1.1em;
- font-weight: bold;
- text-decoration: underline;
- color: #527bbd;
- padding-right: 0.5em;
-}
-div.admonitionblock td.content {
- padding-left: 0.5em;
- border-left: 3px solid #dddddd;
-}
-
-div.exampleblock > div.content {
- border-left: 3px solid #dddddd;
- padding-left: 0.5em;
-}
-
-div.imageblock div.content { padding-left: 0; }
-span.image img { border-style: none; }
-a.image:visited { color: white; }
-
-dl {
- margin-top: 0.8em;
- margin-bottom: 0.8em;
-}
-dt {
- margin-top: 0.5em;
- margin-bottom: 0;
- font-style: normal;
- color: navy;
-}
-dd > *:first-child {
- margin-top: 0.1em;
-}
-
-ul, ol {
- list-style-position: outside;
-}
-ol.arabic {
- list-style-type: decimal;
-}
-ol.loweralpha {
- list-style-type: lower-alpha;
-}
-ol.upperalpha {
- list-style-type: upper-alpha;
-}
-ol.lowerroman {
- list-style-type: lower-roman;
-}
-ol.upperroman {
- list-style-type: upper-roman;
-}
-
-div.compact ul, div.compact ol,
-div.compact p, div.compact p,
-div.compact div, div.compact div {
- margin-top: 0.1em;
- margin-bottom: 0.1em;
-}
-
-div.tableblock > table {
- border: 3px solid #527bbd;
-}
-thead, p.table.header {
- font-family: sans-serif;
- font-weight: bold;
-}
-tfoot {
- font-weight: bold;
-}
-td > div.verse {
- white-space: pre;
-}
-p.table {
- margin-top: 0;
-}
-/* Because the table frame attribute is overriden by CSS in most browsers. */
-div.tableblock > table[frame="void"] {
- border-style: none;
-}
-div.tableblock > table[frame="hsides"] {
- border-left-style: none;
- border-right-style: none;
-}
-div.tableblock > table[frame="vsides"] {
- border-top-style: none;
- border-bottom-style: none;
-}
-
-
-div.hdlist {
- margin-top: 0.8em;
- margin-bottom: 0.8em;
-}
-div.hdlist tr {
- padding-bottom: 15px;
-}
-dt.hdlist1.strong, td.hdlist1.strong {
- font-weight: bold;
-}
-td.hdlist1 {
- vertical-align: top;
- font-style: normal;
- padding-right: 0.8em;
- color: navy;
-}
-td.hdlist2 {
- vertical-align: top;
-}
-div.hdlist.compact tr {
- margin: 0;
- padding-bottom: 0;
-}
-
-.comment {
- background: yellow;
-}
-
-.footnote, .footnoteref {
- font-size: 0.8em;
-}
-
-span.footnote, span.footnoteref {
- vertical-align: super;
-}
-
-#footnotes {
- margin: 20px 0 20px 0;
- padding: 7px 0 0 0;
-}
-
-#footnotes div.footnote {
- margin: 0 0 5px 0;
-}
-
-#footnotes hr {
- border: none;
- border-top: 1px solid silver;
- height: 1px;
- text-align: left;
- margin-left: 0;
- width: 20%;
- min-width: 100px;
-}
-
-
-@media print {
- div#footer-badges { display: none; }
-}
-
-div#toc {
- margin-bottom: 2.5em;
-}
-
-div#toctitle {
- color: #527bbd;
- font-family: sans-serif;
- font-size: 1.1em;
- font-weight: bold;
- margin-top: 1.0em;
- margin-bottom: 0.1em;
-}
-
-div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
- margin-top: 0;
- margin-bottom: 0;
-}
-div.toclevel2 {
- margin-left: 2em;
- font-size: 0.9em;
-}
-div.toclevel3 {
- margin-left: 4em;
- font-size: 0.9em;
-}
-div.toclevel4 {
- margin-left: 6em;
- font-size: 0.9em;
-}
-/* Overrides for manpage documents */
-h1 {
- padding-top: 0.5em;
- padding-bottom: 0.5em;
- border-top: 2px solid silver;
- border-bottom: 2px solid silver;
-}
-h2 {
- border-style: none;
-}
-div.sectionbody {
- margin-left: 5%;
-}
-
-@media print {
- div#toc { display: none; }
-}
-
-/* Workarounds for IE6's broken and incomplete CSS2. */
-
-div.sidebar-content {
- background: #ffffee;
- border: 1px solid silver;
- padding: 0.5em;
-}
-div.sidebar-title, div.image-title {
- color: #527bbd;
- font-family: sans-serif;
- font-weight: bold;
- margin-top: 0.0em;
- margin-bottom: 0.5em;
-}
-
-div.listingblock div.content {
- border: 1px solid silver;
- background: #f4f4f4;
- padding: 0.5em;
-}
-
-div.quoteblock-attribution {
- padding-top: 0.5em;
- text-align: right;
-}
-
-div.verseblock-content {
- white-space: pre;
-}
-div.verseblock-attribution {
- padding-top: 0.75em;
- text-align: left;
-}
-
-div.exampleblock-content {
- border-left: 3px solid #dddddd;
- padding-left: 0.5em;
-}
-
-/* IE6 sets dynamically generated links as visited. */
-div#toc a:visited { color: blue; }
-</style>
-<script type="text/javascript">
-/*<+'])');
- // Function that scans the DOM tree for header elements (the DOM2
- // nodeIterator API would be a better technique but not supported by all
- // browsers).
- var iterate = function (el) {
- for (var i = el.firstChild; i != null; i = i.nextSibling) {
- if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
- var mo = re.exec(i.tagName);
- if (mo && (i.getAttribute("class") || i.getAttribute("className")) != "float") {
- result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
- }
- iterate(i);
- }
- }
- }
- iterate(el);
- return result;
- }
-
- var toc = document.getElementById("toc");
- var entries = tocEntries(document.getElementById("content"), toclevels);
- for (var i = 0; i < entries.length; ++i) {
- var entry = entries[i];
- if (entry.element.id == "")
- entry.element.id = "_toc_" + i;
- var a = document.createElement("a");
- a.href = "#" + entry.element.id;
- a.appendChild(document.createTextNode(entry.text));
- var div = document.createElement("div");
- div.appendChild(a);
- div.className = "toclevel" + entry.toclevel;
- toc.appendChild(div);
- }
- if (entries.length == 0)
- toc.parentNode.removeChild(toc);
-},
-
-
-/////////////////////////////////////////////////////////////////////
-// Footnotes generator
-/////////////////////////////////////////////////////////////////////
-
-/* Based on footnote generation code from:
- * http://www.brandspankingnew.net/archive/2005/07/format_footnote.html
- */
-
-footnotes: function () {
- var cont = document.getElementById("content");
- var noteholder = document.getElementById("footnotes");
- var spans = cont.getElementsByTagName("span");
- var refs = {};
- var n = 0;
- for (i=0; i<spans.length; i++) {
- if (spans[i].className == "footnote") {
- n++;
- // Use [\s\S] in place of . so multi-line matches work.
- // Because JavaScript has no s (dotall) regex flag.
- note = spans[i].innerHTML.match(/\s*\[([\s\S]*)]\s*/)[1];
- noteholder.innerHTML +=
- "<div class='footnote' id='_footnote_" + n + "'>" +
- "<a href='#_footnoteref_" + n + "' title='Return to text'>" +
- n + "</a>. " + note + "</div>";
- spans[i].innerHTML =
- "[<a id='_footnoteref_" + n + "' href='#_footnote_" + n +
- "' title='View footnote' class='footnote'>" + n + "</a>]";
- var id =spans[i].getAttribute("id");
- if (id != null) refs["#"+id] = n;
- }
- }
- if (n == 0)
- noteholder.parentNode.removeChild(noteholder);
- else {
- // Process footnoterefs.
- for (i=0; i<spans.length; i++) {
- if (spans[i].className == "footnoteref") {
- var href = spans[i].getElementsByTagName("a")[0].getAttribute("href");
- href = href.match(/#.*/)[0]; // Because IE return full URL.
- n = refs[href];
- spans[i].innerHTML =
- "[<a href='#_footnote_" + n +
- "' title='View footnote' class='footnote'>" + n + "</a>]";
- }
- }
- }
-}
-
-}
-/*]]>*/
-</script>
-</head>
-<body>
-<div id="header">
-<h1>
-zmq_socket(3) Manual Page
-</h1>
-<h2>NAME</h2>
-<div class="sectionbody">
-<p>zmq_socket -
- create 0MQ socket
-</p>
-</div>
-</div>
-<div id="content">
-<h2 id="_synopsis">SYNOPSIS</h2>
-<div class="sectionbody">
-<div class="paragraph"><p><strong>void *zmq_socket (void <em>*context</em>, int <em>type</em>);</strong></p></div>
-</div>
-<h2 id="_description">DESCRIPTION</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>The <em>zmq_socket()</em> function shall create a ØMQ socket within the specified
-<em>context</em> and return an opaque handle to the newly created socket. The <em>type</em>
-argument specifies the socket type, which determines the semantics of
-communication over the socket.</p></div>
-<div class="paragraph"><p>The newly created socket is initially unbound, and not associated with any
-endpoints. In order to establish a message flow a socket must first be
-connected to at least one endpoint with <a href="zmq_connect.html">zmq_connect(3)</a>, or at least one
-endpoint must be created for accepting incoming connections with
-<a href="zmq_bind.html">zmq_bind(3)</a>.</p></div>
-<div class="paragraph"><div class="title">Key differences to conventional sockets</div><p>Generally speaking, conventional sockets present a <em>synchronous</em> interface to
-either connection-oriented reliable byte streams (SOCK_STREAM), or
-connection-less unreliable datagrams (SOCK_DGRAM). In comparison, ØMQ sockets
-present an abstraction of an asynchronous <em>message queue</em>, with the exact
-queueing semantics depending on the socket type in use. Where conventional
-sockets transfer streams of bytes or discrete datagrams, ØMQ sockets transfer
-discrete <em>messages</em>.</p></div>
-<div class="paragraph"><p>ØMQ sockets being <em>asynchronous</em> means that the timings of the physical
-connection setup and teardown, reconnect and effective delivery are transparent
-to the user and organized by ØMQ itself. Further, messages may be <em>queued</em> in
-the event that a peer is unavailable to receive them.</p></div>
-<div class="paragraph"><p>Conventional sockets allow only strict one-to-one (two peers), many-to-one
-(many clients, one server), or in some cases one-to-many (multicast)
-relationships. With the exception of <em>ZMQ_PAIR</em>, ØMQ sockets may be connected
-<strong>to multiple endpoints</strong> using <em>zmq_connect()</em>, while simultaneously accepting
-incoming connections <strong>from multiple endpoints</strong> bound to the socket using
-<em>zmq_bind()</em>, thus allowing many-to-many relationships.</p></div>
-<div class="paragraph"><div class="title">Socket types</div><p>The following sections present the socket types defined by ØMQ, grouped by the
-general <em>messaging pattern</em> which is built from related socket types.</p></div>
-<h3 id="_request_reply_pattern">Request-reply pattern</h3><div style="clear:left"></div>
-<div class="paragraph"><p>The request-reply pattern is used for sending requests from a <em>client</em> to one
-or more instances of a <em>service</em>, and receiving subsequent replies to each
-request sent.</p></div>
-<h4 id="_zmq_req">ZMQ_REQ</h4>
-<div class="paragraph"><p>A socket of type <em>ZMQ_REQ</em> is used by a <em>client</em> to send requests to and
-receive replies from a <em>service</em>. This socket type allows only an alternating
-sequence of <em>zmq_send(request)</em> and subsequent <em>zmq_recv(reply)</em> calls. Each
-request sent is load-balanced among all <em>services</em>, and each reply received is
-matched with the last issued request.</p></div>
-<div class="paragraph"><p>When a <em>ZMQ_REQ</em> socket enters an exceptional state due to having reached the
-high water mark for all <em>services</em>, or if there are no <em>services</em> at all, then
-any <a href="zmq_send.html">zmq_send(3)</a> operations on the socket shall block until the
-exceptional state ends or at least one <em>service</em> becomes available for sending;
-messages are not discarded.</p></div>
-<div class="hdlist"><div class="title">Summary of ZMQ_REQ characteristics</div><table>
-<tr>
-<td class="hdlist1">
-Compatible peer sockets
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-<em>ZMQ_REP</em>
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Direction
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Bidirectional
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Send/receive pattern
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Send, Receive, Send, Receive, …
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Outgoing routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Load-balanced
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Incoming routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Last peer
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-ZMQ_HWM option action
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Block
-</p>
-</td>
-</tr>
-</table></div>
-<h4 id="_zmq_rep">ZMQ_REP</h4>
-<div class="paragraph"><p>A socket of type <em>ZMQ_REP</em> is used by a <em>service</em> to receive requests from and
-send replies to a <em>client</em>. This socket type allows only an alternating
-sequence of <em>zmq_recv(request)</em> and subsequent <em>zmq_send(reply)</em> calls. Each
-request received is fair-queued from among all <em>clients</em>, and each reply sent
-is routed to the <em>client</em> that issued the last request.</p></div>
-<div class="paragraph"><p>When a <em>ZMQ_REP</em> socket enters an exceptional state due to having reached the
-high water mark for a <em>client</em>, then any replies sent to the <em>client</em> in
-question shall be dropped until the exceptional state ends.</p></div>
-<div class="hdlist"><div class="title">Summary of ZMQ_REP characteristics</div><table>
-<tr>
-<td class="hdlist1">
-Compatible peer sockets
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-<em>ZMQ_REQ</em>
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Direction
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Bidirectional
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Send/receive pattern
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Receive, Send, Receive, Send, …
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Incoming routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Fair-queued
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Outgoing routing stratagy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Last peer
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-ZMQ_HWM option action
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Drop
-</p>
-</td>
-</tr>
-</table></div>
-<h4 id="_zmq_xreq">ZMQ_XREQ</h4>
-<div class="paragraph"><p>A socket of type <em>ZMQ_XREQ</em> is an advanced pattern used for extending
-request/reply sockets. Each message sent is load-balanced among all connected
-peers, and each message received is fair-queued from all connected peers.</p></div>
-<div class="paragraph"><p>When a <em>ZMQ_XREQ</em> socket enters an exceptional state due to having reached the
-high water mark for all peers, or if there are no peers at all, then any
-<a href="zmq_send.html">zmq_send(3)</a> operations on the socket shall block until the exceptional
-state ends or at least one peer becomes available for sending; messages are not
-discarded.</p></div>
-<div class="paragraph"><p>When a <em>ZMQ_XREQ</em> socket is connected to a <em>ZMQ_REP</em> socket each message sent
-must consist of an empty message part, the <em>delimiter</em>, followed by one or more
-<em>body parts</em>.</p></div>
-<div class="hdlist"><div class="title">Summary of ZMQ_XREQ characteristics</div><table>
-<tr>
-<td class="hdlist1">
-Compatible peer sockets
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-<em>ZMQ_XREP</em>, <em>ZMQ_REP</em>
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Direction
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Bidirectional
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Send/receive pattern
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Unrestricted
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Outgoing routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Load-balanced
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Incoming routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Fair-queued
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-ZMQ_HWM option action
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Block
-</p>
-</td>
-</tr>
-</table></div>
-<h4 id="_zmq_xrep">ZMQ_XREP</h4>
-<div class="paragraph"><p>A socket of type <em>ZMQ_XREP</em> is an advanced pattern used for extending
-request/reply sockets. When receiving messages a <em>ZMQ_XREP</em> socket shall
-prepend a message part containing the <em>identity</em> of the originating peer to the
-message before passing it to the application. Messages received are fair-queued
-from among all connected peers. When sending messages a <em>ZMQ_XREP</em> socket shall
-remove the first part of the message and use it to determine the <em>identity</em> of
-the peer the message shall be routed to.</p></div>
-<div class="paragraph"><p>When a <em>ZMQ_XREP</em> socket enters an exceptional state due to having reached the
-high water mark for all peers, or if there are no peers at all, then any
-messages sent to the socket shall be dropped until the exceptional state ends.
-Likewise, any messages routed to a non-existent peer or a peer for which the
-individual high water mark has been reached shall also be dropped.</p></div>
-<div class="paragraph"><p>When a <em>ZMQ_REQ</em> socket is connected to a <em>ZMQ_XREP</em> socket, in addition to the
-<em>identity</em> of the originating peer each message received shall contain an empty
-<em>delimiter</em> message part. Hence, the entire structure of each received message
-as seen by the application becomes: one or more <em>identity</em> parts, <em>delimiter</em>
-part, one or more <em>body parts</em>. When sending replies to a <em>ZMQ_REQ</em> socket the
-application must include the <em>delimiter</em> part.</p></div>
-<div class="hdlist"><div class="title">Summary of ZMQ_XREP characteristics</div><table>
-<tr>
-<td class="hdlist1">
-Compatible peer sockets
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-<em>ZMQ_XREQ</em>, <em>ZMQ_REQ</em>
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Direction
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Bidirectional
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Send/receive pattern
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Unrestricted
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Outgoing routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-See text
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Incoming routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Fair-queued
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-ZMQ_HWM option action
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Drop
-</p>
-</td>
-</tr>
-</table></div>
-<h3 id="_publish_subscribe_pattern">Publish-subscribe pattern</h3><div style="clear:left"></div>
-<div class="paragraph"><p>The publish-subscribe pattern is used for one-to-many distribution of data from
-a single <em>publisher</em> to multiple <em>subscribers</em> in a fanout fashion.</p></div>
-<h4 id="_zmq_pub">ZMQ_PUB</h4>
-<div class="paragraph"><p>A socket of type <em>ZMQ_PUB</em> is used by a <em>publisher</em> to distribute data.
-Messages sent are distributed in a fanout fashion to all connected peers.
-The <a href="zmq_recv.html">zmq_recv(3)</a> function is not implemented for this socket type.</p></div>
-<div class="paragraph"><p>When a <em>ZMQ_PUB</em> socket enters an exceptional state due to having reached the
-high water mark for a <em>subscriber</em>, then any messages that would be sent to the
-<em>subscriber</em> in question shall instead be dropped until the exceptional state
-ends.</p></div>
-<div class="hdlist"><div class="title">Summary of ZMQ_PUB characteristics</div><table>
-<tr>
-<td class="hdlist1">
-Compatible peer sockets
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-<em>ZMQ_SUB</em>
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Direction
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Unidirectional
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Send/receive pattern
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Send only
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Incoming routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-N/A
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Outgoing routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Fanout
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-ZMQ_HWM option action
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Drop
-</p>
-</td>
-</tr>
-</table></div>
-<h4 id="_zmq_sub">ZMQ_SUB</h4>
-<div class="paragraph"><p>A socket of type <em>ZMQ_SUB</em> is used by a <em>subscriber</em> to subscribe to data
-distributed by a <em>publisher</em>. Initially a <em>ZMQ_SUB</em> socket is not subscribed to
-any messages, use the <em>ZMQ_SUBSCRIBE</em> option of <a href="zmq_setsockopt.html">zmq_setsockopt(3)</a> to
-specify which messages to subscribe to. The <em>zmq_send()</em> function is not
-implemented for this socket type.</p></div>
-<div class="hdlist"><div class="title">Summary of ZMQ_SUB characteristics</div><table>
-<tr>
-<td class="hdlist1">
-Compatible peer sockets
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-<em>ZMQ_PUB</em>
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Direction
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Unidirectional
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Send/receive pattern
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Receive only
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Incoming routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Fair-queued
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Outgoing routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-N/A
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-ZMQ_HWM option action
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-N/A
-</p>
-</td>
-</tr>
-</table></div>
-<h3 id="_pipeline_pattern">Pipeline pattern</h3><div style="clear:left"></div>
-<div class="paragraph"><p>The pipeline pattern is used for distributing data to <em>nodes</em> arranged in
-a pipeline. Data always flows down the pipeline, and each stage of the pipeline
-is connected to at least one <em>node</em>. When a pipeline stage is connected to
-multiple <em>nodes</em> data is load-balanced among all connected <em>nodes</em>.</p></div>
-<h4 id="_zmq_push">ZMQ_PUSH</h4>
-<div class="paragraph"><p>A socket of type <em>ZMQ_PUSH</em> is used by a pipeline <em>node</em> to send messages
-to downstream pipeline <em>nodes</em>. Messages are load-balanced to all connected
-downstream <em>nodes</em>. The <em>zmq_recv()</em> function is not implemented for this
-socket type.</p></div>
-<div class="paragraph"><p>When a <em>ZMQ_PUSH</em> socket enters an exceptional state due to having reached the
-high water mark for all downstream <em>nodes</em>, or if there are no downstream
-<em>nodes</em> at all, then any <a href="zmq_send.html">zmq_send(3)</a> operations on the socket shall
-block until the exceptional state ends or at least one downstream <em>node</em>
-becomes available for sending; messages are not discarded.</p></div>
-<div class="paragraph"><p>Deprecated alias: <em>ZMQ_DOWNSTREAM</em>.</p></div>
-<div class="hdlist"><div class="title">Summary of ZMQ_PUSH characteristics</div><table>
-<tr>
-<td class="hdlist1">
-Compatible peer sockets
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-<em>ZMQ_PULL</em>
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Direction
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Unidirectional
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Send/receive pattern
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Send only
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Incoming routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-N/A
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Outgoing routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Load-balanced
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-ZMQ_HWM option action
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Block
-</p>
-</td>
-</tr>
-</table></div>
-<h4 id="_zmq_pull">ZMQ_PULL</h4>
-<div class="paragraph"><p>A socket of type <em>ZMQ_PULL</em> is used by a pipeline <em>node</em> to receive messages
-from upstream pipeline <em>nodes</em>. Messages are fair-queued from among all
-connected upstream <em>nodes</em>. The <em>zmq_send()</em> function is not implemented for
-this socket type.</p></div>
-<div class="paragraph"><p>Deprecated alias: <em>ZMQ_UPSTREAM</em>.</p></div>
-<div class="hdlist"><div class="title">Summary of ZMQ_PULL characteristics</div><table>
-<tr>
-<td class="hdlist1">
-Compatible peer sockets
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-<em>ZMQ_PUSH</em>
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Direction
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Unidirectional
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Send/receive pattern
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Receive only
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Incoming routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Fair-queued
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Outgoing routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-N/A
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-ZMQ_HWM option action
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-N/A
-</p>
-</td>
-</tr>
-</table></div>
-<h3 id="_exclusive_pair_pattern">Exclusive pair pattern</h3><div style="clear:left"></div>
-<div class="paragraph"><p>The exclusive pair is an advanced pattern used for communicating exclusively
-between two peers.</p></div>
-<h4 id="_zmq_pair">ZMQ_PAIR</h4>
-<div class="paragraph"><p>A socket of type <em>ZMQ_PAIR</em> can only be connected to a single peer at any one
-time. No message routing or filtering is performed on messages sent over a
-<em>ZMQ_PAIR</em> socket.</p></div>
-<div class="paragraph"><p>When a <em>ZMQ_PAIR</em> socket enters an exceptional state due to having reached the
-high water mark for the connected peer, or if no peer is connected, then
-any <a href="zmq_send.html">zmq_send(3)</a> operations on the socket shall block until the peer
-becomes available for sending; messages are not discarded.</p></div>
-<div class="admonitionblock">
-<table><tr>
-<td class="icon">
-<div class="title">Note</div>
-</td>
-<td class="content"><em>ZMQ_PAIR</em> sockets are experimental, and are currently missing several
-features such as auto-reconnection.</td>
-</tr></table>
-</div>
-<div class="hdlist"><div class="title">Summary of ZMQ_PAIR characteristics</div><table>
-<tr>
-<td class="hdlist1">
-Compatible peer sockets
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-<em>ZMQ_PAIR</em>
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Direction
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Bidirectional
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Send/receive pattern
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Unrestricted
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Incoming routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-N/A
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Outgoing routing strategy
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-N/A
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-ZMQ_HWM option action
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-Block
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<h2 id="_return_value">RETURN VALUE</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>The <em>zmq_socket()</em> function shall return an opaque handle to the newly created
-socket if successful. Otherwise, it shall return NULL and set <em>errno</em> to one of
-the values defined below.</p></div>
-</div>
-<h2 id="_errors">ERRORS</h2>
-<div class="sectionbody">
-<div class="dlist"><dl>
-<dt class="hdlist1">
-<strong>EINVAL</strong>
-</dt>
-<dd>
-<p>
-The requested socket <em>type</em> is invalid.
-</p>
-</dd>
-<dt class="hdlist1">
-<strong>EMTHREAD</strong>
-</dt>
-<dd>
-<p>
-The maximum number of sockets within this <em>context</em> has been exceeded.
-</p>
-</dd>
-<dt class="hdlist1">
-<strong>EFAULT</strong>
-</dt>
-<dd>
-<p>
-The provided <em>context</em> was not valid (NULL).
-</p>
-</dd>
-</dl></div>
-</div>
-<h2 id="_see_also">SEE ALSO</h2>
-<div class="sectionbody">
-<div class="paragraph"><p><a href="zmq_init.html">zmq_init(3)</a>
-<a href="zmq_setsockopt.html">zmq_setsockopt(3)</a>
-<a href="zmq_bind.html">zmq_bind(3)</a>
-<a href="zmq_connect.html">zmq_connect(3)</a>
-<a href="zmq_send.html">zmq_send(3)</a>
-<a href="zmq_recv.html">zmq_recv(3)</a>
-<a href="zmq.html">zmq(7)</a></p></div>
-</div>
-<h2 id="_authors">AUTHORS</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>The ØMQ documentation was written by Martin Sustrik <<a href="mailto:sustrik@250bpm.com">sustrik@250bpm.com</a>> and
-Martin Lucina <<a href="mailto:mato@kotelna.sk">mato@kotelna.sk</a>>.</p></div>
-</div>
-</div>
-<div id="footnotes"><hr /></div>
-<div id="footer">
-<div id="footer-text">
-ØMQ 2.0.10<br />
-Last updated 2010-10-15 19:26:37 CEST
-</div>
-</div>
-</body>
-</html>
|