178 lines
4.4 KiB
HTML
178 lines
4.4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>QsoCreateIOCompletionPort()--Create I/O Completion Port</title>
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<!-- Begin Header Records -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Change History: -->
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<!-- YYMMDD USERID Change description -->
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<!-- Created for V5R1 -->
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<!-- Edited by Kersten Feb 02 -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!--Java sync-link-->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>QsoCreateIOCompletionPort()--Create I/O Completion Port</h2>
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<div class="box" style="width: 60%;">
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<br>
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Syntax
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<pre>
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#include <qsoasync.h>
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int QsoCreateIOCompletionPort()
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</pre>
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<br>
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Service Program Name: QSOSRV3<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The QsoCreateIOCompletionPort is used to create a common wait point for a
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completed overlapped I/O operation. The wait point is represented by the I/O
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completion port handle returned by the QsoCreateIOCompletionPort() function.
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This handle is specified on QsoStartRecv and QsoStartSend functions to initiate
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overlapped I/O operations.</p>
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<br>
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<h3>Authorities</h3>
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<p>No authorization is required.</p>
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<br>
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<h3>Return Values</h3>
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<p><em>QsoCreateIOCompletionPort()</em> returns an integer. Possible values are:</p>
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<ul>
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<li>-1 - Unsuccessful, errno is set to a value defined below.</li>
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<li>n - Successful, where n is an I/O completion port handle that can be used
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in conjunction with overlapped I/O functions QsoStartRecv(), QsoStartSend(),
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and QsoPostIOCompletionPort().</li>
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</ul>
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<br>
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<h3>Errno Conditions</h3>
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<p>When QsoCreateIOCompletionPort() fails, errno can be set to one of the
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following:</p>
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<table cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<td align="left" valign="top">[ENOBUFS]</td>
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<td align="left" valign="top">The limit of 256 I/O completion ports has been
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exceeded for this process.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">[EUNKNOWN]</td>
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<td align="left" valign="top">Unknown system state.</td>
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</tr>
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</table>
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<br>
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<br>
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<h3>Error Messages</h3>
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<table width="100%" cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<th align="left" valign="top">Message ID</th>
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<th align="left" valign="top">Error Message Text</th>
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</tr>
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<tr>
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<td width="15%" valign="top">CPE3418 E</td>
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<td width="85%" valign="top">Possible APAR condition or hardware failure.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA081 E</td>
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<td align="left" valign="top">Unable to set return value or error code.</td>
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</tr>
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</table>
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<br>
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<br>
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<h3>Usage Notes</h3>
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<ol>
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<li>The I/O completion port handle is a process scoped resource; therefore, you
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may not start an overlapped I/O function on a socket in one process and check
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for its completion in another process.<br>
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<br>
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</li>
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<li>The number of I/O completion ports that can be active for a given process
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is 256.</li>
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</ol>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li><a href="destroyiocompletionport.htm">QsoDestroyIOCompletionPort()</a>--Create
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I/O Completion Port<br><br></li>
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<li><a href="postiocompletion.htm">QsoPostIOCompletionPort()</a>--Post Request on
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I/O Completion Port<br><br></li>
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<li><a href="startrecv.htm">QsoStartRecv</a>--Start Asynchronous Recv
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Operation<br><br></li>
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<li><a href="startsend.htm">QsoStartSend</a>--Start Asynchronous Send
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Operation<br><br></li>
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<li><a href="waitforiocompletion.htm">QsoWaitForIOCompletion()</a>--Wait for I/O
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Completion Operation</li>
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</ul>
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<br>
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<hr>
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API introduced: V5R1
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table></center>
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</body>
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</html>
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