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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>aio_suspend</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_001_149"> </a>NAME</h4><blockquote>aio_suspend - wait for an asynchronous I/O request(<b>REALTIME</b>)</blockquote><h4><a name = "tag_000_001_150"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="aio.h.html">aio.h</a>>int aio_suspend(const struct aiocb * const <i>list</i>[], int <i>nent</i>, const struct timespec *<i>timeout</i>);</code></pre></blockquote><h4><a name = "tag_000_001_151"> </a>DESCRIPTION</h4><blockquote>The<i>aio_suspend()</i>function suspends the calling thread until at least one of theasynchronous I/O operations referenced 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 to completed asynchronous I/O operations(that is, the error status for the operation is not equal to EINPROGRESS)at the time of the call,the function returns without suspending the calling threadThe<i>list</i>argument is an array of pointers to asynchronous I/O control blocks.The<i>nent</i>argument indicates the number of elements in the array.Each<b>aiocb</b>structure pointed to will have been used in initiating an asynchronousI/O request via<i><a href="aio_read.html">aio_read()</a></i>,<i><a href="aio_write.html">aio_write()</a></i>,or<i><a href="lio_listio.html">lio_listio()</a></i>.This array may contain NULL pointers, which are ignored.If this array contains pointers that refer to<b>aiocb</b>structures that have not been used in submitting asynchronous I/O,the effect is undefined.<p>If the time interval indicated in the<b>timespec</b>structure pointed to by<i>timeout</i>passes before any of the I/O operations referenced by<i>list</i>are completed, then<i>aio_suspend()</i>returns with an error.</blockquote><h4><a name = "tag_000_001_152"> </a>RETURN VALUE</h4><blockquote>If the<i>aio_suspend()</i>function returns after one or more asynchronous I/O operations have completed,the function returns zero.Otherwise, the function returns a value of -1 and sets<i>errno</i>to indicate the error.<p>The application may determine which asynchronous I/O completedby scanning the associated error and return status using<i><a href="aio_error.html">aio_error()</a></i>and<i><a href="aio_return.html">aio_return()</a></i>,respectively.</blockquote><h4><a name = "tag_000_001_153"> </a>ERRORS</h4><blockquote>The <i>aio_suspend()</i>function will fail if:<dl compact><dt>[EAGAIN]<dd>No asynchronous I/O indicated in the list referenced by<i>list</i>completed in the time interval indicated by<i>timeout</i>.<dt>[EINTR]<dd>A signal interrupted the<i>aio_suspend()</i>function.Note that, since each asynchronous I/O operationmay possibly provoke a signal when it completes,this error return may be caused by the completion of one (or more) of thevery I/O operations being awaited.<dt>[ENOSYS]<dd>The<i>aio_suspend()</i>function is not supported by this implementation.</dl></blockquote><h4><a name = "tag_000_001_154"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_155"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_156"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_157"> </a>SEE ALSO</h4><blockquote><i><a href="aio_read.html">aio_read()</a></i>,<i><a href="aio_write.html">aio_write()</a></i>,<i><a href="lio_listio.html">lio_listio()</a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995)</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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