📄 aio_suspend.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>aio_suspend</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="aio_suspend"></a> <a name="tag_03_19"></a><!-- aio_suspend --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_19_01"></a>NAME</h4><blockquote>aio_suspend - wait for an asynchronous I/O request (<b>REALTIME</b>)</blockquote><h4><a name="tag_03_19_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('AIO')">AIO</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/aio.h.html">aio.h</a>><br><br> int aio_suspend(const struct aiocb * const</tt> <i>list</i><tt>[], int</tt> <i>nent</i><tt>,<br> const struct timespec *</tt><i>timeout</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_19_03"></a>DESCRIPTION</h4><blockquote><p>The <i>aio_suspend</i>() function shall suspend the calling thread until at least one of the asynchronous I/O operationsreferenced by the <i>list</i> argument has completed, until a signal interrupts the function, or, if <i>timeout</i> is not NULL,until the time interval specified by <i>timeout</i> has passed. If any of the <b>aiocb</b> structures in the list correspond tocompleted asynchronous I/O operations (that is, the error status for the operation is not equal to [EINPROGRESS]) at the time ofthe call, the function shall return without suspending the calling thread. The <i>list</i> argument is an array of pointers toasynchronous I/O control blocks. The <i>nent</i> argument indicates the number of elements in the array. Each <b>aiocb</b>structure pointed to has been used in initiating an asynchronous I/O request via <a href="../functions/aio_read.html"><i>aio_read</i>()</a>, <a href="../functions/aio_write.html"><i>aio_write</i>()</a>, or <a href="../functions/lio_listio.html"><i>lio_listio</i>()</a>. This array may contain NULL pointers, which are ignored. If this arraycontains pointers that refer to <b>aiocb</b> structures that have not been used in submitting asynchronous I/O, the effect isundefined.</p><p>If the time interval indicated in the <b>timespec</b> structure pointed to by <i>timeout</i> passes before any of the I/Ooperations referenced by <i>list</i> are completed, then <i>aio_suspend</i>() shall return with an error. <sup>[<a href="javascript:open_code('MON')">MON</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> If theMonotonic Clock option is supported, the clock that shall be used to measure this time interval shall be the CLOCK_MONOTONIC clock.<img src="../images/opt-end.gif" alt="[Option End]" border="0"></p></blockquote><h4><a name="tag_03_19_04"></a>RETURN VALUE</h4><blockquote><p>If the <i>aio_suspend</i>() function returns after one or more asynchronous I/O operations have completed, the function shallreturn zero. Otherwise, the function shall return a value of -1 and set <i>errno</i> to indicate the error.</p><p>The application may determine which asynchronous I/O completed by scanning the associated error and return status using <a href="../functions/aio_error.html"><i>aio_error</i>()</a> and <a href="../functions/aio_return.html"><i>aio_return</i>()</a>,respectively.</p></blockquote><h4><a name="tag_03_19_05"></a>ERRORS</h4><blockquote><p>The <i>aio_suspend</i>() function shall fail if:</p><dl compact><dt>[EAGAIN]</dt><dd>No asynchronous I/O indicated in the list referenced by <i>list</i> completed in the time interval indicated by<i>timeout</i>.</dd><dt>[EINTR]</dt><dd>A signal interrupted the <i>aio_suspend</i>() function. Note that, since each asynchronous I/O operation may possibly provoke asignal when it completes, this error return may be caused by the completion of one (or more) of the very I/O operations beingawaited.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_19_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_19_07"></a>APPLICATION USAGE</h4><blockquote><p>The <i>aio_suspend</i>() function is part of the Asynchronous Input and Output option and need not be available on allimplementations.</p></blockquote><h4><a name="tag_03_19_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_19_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_19_10"></a>SEE ALSO</h4><blockquote><p><a href="aio_read.html"><i>aio_read</i>()</a> , <a href="aio_write.html"><i>aio_write</i>()</a> , <a href="lio_listio.html"><i>lio_listio</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/aio.h.html"><i><aio.h></i></a></p></blockquote><h4><a name="tag_03_19_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 5. Included for alignment with the POSIX Realtime Extension.</p></blockquote><h4><a name="tag_03_19_12"></a>Issue 6</h4><blockquote><p>The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support theAsynchronous Input and Output option.</p><p>The APPLICATION USAGE section is added.</p><p>The DESCRIPTION is updated for alignment with IEEE Std 1003.1j-2000 by specifying that the CLOCK_MONOTONIC clock, ifsupported, is used.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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