diff options
| author | Martin Lucina <martin@lucina.net> | 2012-01-23 08:53:35 +0100 |
|---|---|---|
| committer | Martin Lucina <martin@lucina.net> | 2012-01-23 08:53:35 +0100 |
| commit | e645fc2693acc796304498909786b7b47005b429 (patch) | |
| tree | 4118cd4c7b9eba3ba1d6892800c79669ea94c4e9 /doc/zmq_poll.html | |
| parent | 2c416a793ea781273a5da6742211f5f01af13a2b (diff) | |
Imported Upstream version 2.1.3upstream/2.1.3
Diffstat (limited to 'doc/zmq_poll.html')
| -rw-r--r-- | doc/zmq_poll.html | 764 |
1 files changed, 0 insertions, 764 deletions
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-<div id="header">
-<h1>
-zmq_poll(3) Manual Page
-</h1>
-<h2>NAME</h2>
-<div class="sectionbody">
-<p>zmq_poll -
- input/output multiplexing
-</p>
-</div>
-</div>
-<div id="content">
-<h2 id="_synopsis">SYNOPSIS</h2>
-<div class="sectionbody">
-<div class="paragraph"><p><strong>int zmq_poll (zmq_pollitem_t <em>*items</em>, int <em>nitems</em>, long <em>timeout</em>);</strong></p></div>
-</div>
-<h2 id="_description">DESCRIPTION</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>The <em>zmq_poll()</em> function provides a mechanism for applications to multiplex
-input/output events in a level-triggered fashion over a set of sockets. Each
-member of the array pointed to by the <em>items</em> argument is a <strong>zmq_pollitem_t</strong>
-structure. The <em>nitems</em> argument specifies the number of items in the <em>items</em>
-array. The <strong>zmq_pollitem_t</strong> structure is defined as follows:</p></div>
-<div class="literalblock">
-<div class="content">
-<pre><tt>typedef struct
-{
- void <em>*socket</em>;
- int <em>fd</em>;
- short <em>events</em>;
- short <em>revents</em>;
-} zmq_pollitem_t;</tt></pre>
-</div></div>
-<div class="paragraph"><p>For each <strong>zmq_pollitem_t</strong> item, <em>zmq_poll()</em> shall examine either the ØMQ
-socket referenced by <em>socket</em> <strong>or</strong> the standard socket specified by the file
-descriptor <em>fd</em>, for the event(s) specified in <em>events</em>. If both <em>socket</em> and
-<em>fd</em> are set in a single <strong>zmq_pollitem_t</strong>, the ØMQ socket referenced by
-<em>socket</em> shall take precedence and the value of <em>fd</em> shall be ignored.</p></div>
-<div class="admonitionblock">
-<table><tr>
-<td class="icon">
-<div class="title">Note</div>
-</td>
-<td class="content">All ØMQ sockets passed to the <em>zmq_poll()</em> function must share the
-same ØMQ <em>context</em> and must belong to the thread calling <em>zmq_poll()</em>.</td>
-</tr></table>
-</div>
-<div class="paragraph"><p>For each <strong>zmq_pollitem_t</strong> item, <em>zmq_poll()</em> shall first clear the <em>revents</em>
-member, and then indicate any requested events that have occured by setting the
-bit corresponding to the event condition in the <em>revents</em> member.</p></div>
-<div class="paragraph"><p>If none of the requested events have occured on any <strong>zmq_pollitem_t</strong> item,
-<em>zmq_poll()</em> shall wait up to <em>timeout</em> microseconds for an event to occur on
-any of the requested items. If the value of <em>timeout</em> is <tt>0</tt>, <em>zmq_poll()</em>
-shall return immediately. If the value of <em>timeout</em> is <tt>-1</tt>, <em>zmq_poll()</em> shall
-block indefinitely until a requested event has occured on at least one
-<strong>zmq_pollitem_t</strong>.</p></div>
-<div class="paragraph"><p>The <em>events</em> and <em>revents</em> members of <strong>zmq_pollitem_t</strong> are bitmasks constructed
-by OR’ing a combination of the following event flags:</p></div>
-<div class="dlist"><dl>
-<dt class="hdlist1">
-<strong>ZMQ_POLLIN</strong>
-</dt>
-<dd>
-<p>
-For ØMQ sockets, at least one message may be received from the <em>socket</em> without
-blocking. For standard sockets this is equivalent to the <em>POLLIN</em> flag of the
-<em>poll()</em> system call and generally means that at least one byte of data may be
-read from <em>fd</em> without blocking.
-</p>
-</dd>
-<dt class="hdlist1">
-<strong>ZMQ_POLLOUT</strong>
-</dt>
-<dd>
-<p>
-For ØMQ sockets, at least one message may be sent to the <em>socket</em> without
-blocking. For standard sockets this is equivalent to the <em>POLLOUT</em> flag of the
-<em>poll()</em> system call and generally means that at least one byte of data may be
-written to <em>fd</em> without blocking.
-</p>
-</dd>
-<dt class="hdlist1">
-<strong>ZMQ_POLLERR</strong>
-</dt>
-<dd>
-<p>
-For standard sockets, this flag is passed through <em>zmq_poll()</em> to the
-underlying <em>poll()</em> system call and generally means that some sort of error
-condition is present on the socket specified by <em>fd</em>. For ØMQ sockets this flag
-has no effect if set in <em>events</em>, and shall never be returned in <em>revents</em> by
-<em>zmq_poll()</em>.
-</p>
-</dd>
-</dl></div>
-<div class="admonitionblock">
-<table><tr>
-<td class="icon">
-<div class="title">Note</div>
-</td>
-<td class="content">The <em>zmq_poll()</em> function may be implemented or emulated using operating
-system interfaces other than <em>poll()</em>, and as such may be subject to the limits
-of those interfaces in ways not defined in this documentation.</td>
-</tr></table>
-</div>
-</div>
-<h2 id="_return_value">RETURN VALUE</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>Upon successful completion, the <em>zmq_poll()</em> function shall return the number
-of <strong>zmq_pollitem_t</strong> structures with events signaled in <em>revents</em> or <tt>0</tt> if no
-events have been signaled. Upon failure, <em>zmq_poll()</em> shall return <tt>-1</tt> and set
-<em>errno</em> to one of the values defined below.</p></div>
-<div class="admonitionblock">
-<table><tr>
-<td class="icon">
-<div class="title">Important</div>
-</td>
-<td class="content">The <em>zmq_poll()</em> function may return <strong>before</strong> the <em>timeout</em> period
-has expired even if no events have been signaled.</td>
-</tr></table>
-</div>
-</div>
-<h2 id="_errors">ERRORS</h2>
-<div class="sectionbody">
-<div class="dlist"><dl>
-<dt class="hdlist1">
-<strong>EFAULT</strong>
-</dt>
-<dd>
-<p>
-At least one of the members of the <em>items</em> array refers to a <em>socket</em> belonging
-to a different application thread.
-</p>
-</dd>
-<dt class="hdlist1">
-<strong>ETERM</strong>
-</dt>
-<dd>
-<p>
-At least one of the members of the <em>items</em> array refers to a <em>socket</em> whose
-associated ØMQ <em>context</em> was terminated.
-</p>
-</dd>
-<dt class="hdlist1">
-<strong>EFAULT</strong>
-</dt>
-<dd>
-<p>
-The provided <em>items</em> was not valid (NULL).
-</p>
-</dd>
-</dl></div>
-</div>
-<h2 id="_example">EXAMPLE</h2>
-<div class="sectionbody">
-<div class="listingblock">
-<div class="title">Polling indefinitely for input events on both a ØMQ socket and a standard socket.</div>
-<div class="content">
-<pre><tt>zmq_pollitem_t items [2];
-/* First item refers to 0MQ socket 'socket' */
-items[0].socket = socket;
-items[0].events = ZMQ_POLLIN;
-/* Second item refers to standard socket 'fd' */
-items[1].socket = NULL;
-items[1].fd = fd;
-items[1].events = ZMQ_POLLIN;
-/* Poll for events indefinitely */
-int rc = zmq_poll (items, 2, -1);
-assert (rc >= 0);
-/* Returned events will be stored in items[].revents */</tt></pre>
-</div></div>
-</div>
-<h2 id="_see_also">SEE ALSO</h2>
-<div class="sectionbody">
-<div class="paragraph"><p><a href="zmq_socket.html">zmq_socket(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 class="paragraph"><p>Your operating system documentation for the <em>poll()</em> system call.</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 19:40:36 CEST
-</div>
-</div>
-</body>
-</html>
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