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  <title>PycURL: CurlMulti Objects</title>
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<h1>CurlMulti Object</h1>

<p>CurlMulti objects have the following methods: </p>

<dl>
<dt><code>close()</code> -&gt; <em>None</em></dt>
<dd>
<p>Corresponds to
<a href="http://curl.haxx.se/libcurl/c/curl_multi_cleanup.html"><code>curl_multi_cleanup()</code></a> in libcurl.
This method is automatically called by pycurl when a CurlMulti object no
longer has any references to it, but can also be called
explicitly.</p>
</dd>

<dt><code>perform()</code> -&gt; <em>tuple of status and the number of active Curl objects</em></dt>
<dd>
<p>Corresponds to
<a href="http://curl.haxx.se/libcurl/c/curl_multi_perform.html"><code>curl_multi_perform()</code></a> in libcurl.</p>
</dd>

<dt><code>add_handle(</code><em>Curl object</em><code>) </code>-&gt; <em>None</em></dt>
<dd>
<p>Corresponds to
<a href="http://curl.haxx.se/libcurl/c/curl_multi_add_handle.html"><code>curl_multi_add_handle()</code></a> in libcurl.
This method  adds an existing and valid Curl object to the CurlMulti
object.</p>

<p>IMPORTANT NOTE: add_handle does not implicitly add a Python reference
to the Curl object (and thus does not increase the reference count on the Curl
object).</p>
</dd>

<dt><code>remove_handle(</code><em>Curl object</em><code>)</code> -&gt; <em>None</em></dt>
<dd>
<p>Corresponds to
<a href="http://curl.haxx.se/libcurl/c/curl_multi_remove_handle.html"><code>curl_multi_remove_handle()</code></a> in libcurl.
This method removes an existing and valid Curl object from the CurlMulti
object.</p>

<p>IMPORTANT NOTE: remove_handle does not implicitly remove a Python reference
from the Curl object (and thus does not decrease the reference count on the Curl
object).</p>
</dd>

<dt><code>fdset()</code> -&gt;
<em>triple of lists with active file descriptors,
readable,  writeable, exceptions.</em></dt>
<dd>
<p>Corresponds to
<a href="http://curl.haxx.se/libcurl/c/curl_multi_fdset.html"><code>curl_multi_fdset()</code></a> in libcurl.
This method extracts  the file descriptor information from a CurlMulti object.
The returned  lists can be used with the <code>select</code> module to
poll for events.</p>

<p>Example usage:</p>

<pre>
import pycurl
c = pycurl.Curl()
c.setopt(pycurl.URL, "http://curl.haxx.se")
m = pycurl.CurlMulti()
m.add_handle(c)
while 1:
    ret, num_handles = m.perform()
    if ret != pycurl.E_CALL_MULTI_PERFORM: break
while num_handles:
    apply(select.select, m.fdset() + (1,))
    while 1:
        ret, num_handles = m.perform()
        if ret != pycurl.E_CALL_MULTI_PERFORM: break
</pre>
</dd>

<dt><code>select(</code><em>timeout</em><code>)</code> -&gt;
<em>number of ready file descriptors or -1 on timeout</em></dt>
<dd>
<p>This is a convenience function which simplifies the combined
use of <code>fdset()</code> and the <code>select</code> module.</p>

<p>Example usage:</p>

<pre>import pycurl
c = pycurl.Curl()
c.setopt(pycurl.URL, "http://curl.haxx.se")
m = pycurl.CurlMulti()
m.add_handle(c)
while 1:
    ret, num_handles = m.perform()
    if ret != pycurl.E_CALL_MULTI_PERFORM: break
while num_handles:
    ret = m.select(1.0)
    if ret == -1:  continue
    while 1:
        ret, num_handles = m.perform()
        if ret != pycurl.E_CALL_MULTI_PERFORM: break
</pre>
</dd>

<dt><code>info_read(</code><em>[max]</em><code>)</code> -&gt;
<em>numberof queued messages, a list of successful objects, a list of
failed objects</em></dt>
<dd>
<p>Corresponds to the
<a href="http://curl.haxx.se/libcurl/c/curl_multi_info_read.html"><code>curl_multi_info_read()</code></a> function in libcurl.
This method extracts at most <em>max</em> messages
from the multi stack and returns them in two lists. The first
list contains the handles which completed successfully and the second
list contains a tuple <em>&lt;curl object, curl error number, curl
error message&gt;</em> for each failed curl object. The number
of queued messages after this method has been called is also
returned.</p>
</dd>
</dl>

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