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90 lines
3.4 KiB
HTML
90 lines
3.4 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>clock (The Red Hat newlib C Library)</title>
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<meta name="description" content="clock (The Red Hat newlib C Library)">
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<meta name="keywords" content="clock (The Red Hat newlib C Library)">
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<meta name="resource-type" content="document">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Timefns.html#Timefns" rel="up" title="Timefns">
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<link href="ctime.html#ctime" rel="next" title="ctime">
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</head>
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<body lang="en">
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<a name="clock"></a>
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<div class="header">
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<p>
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Next: <a href="ctime.html#ctime" accesskey="n" rel="next">ctime</a>, Previous: <a href="asctime.html#asctime" accesskey="p" rel="prev">asctime</a>, Up: <a href="Timefns.html#Timefns" accesskey="u" rel="up">Timefns</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="clock_002d_002d_002dcumulative-processor-time"></a>
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<h3 class="section">8.2 <code>clock</code>—cumulative processor time</h3>
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<a name="index-clock"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <time.h>
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clock_t clock(void);
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</pre></div>
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<p><strong>Description</strong><br>
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Calculates the best available approximation of the cumulative amount
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of time used by your program since it started. To convert the result
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into seconds, divide by the macro <code>CLOCKS_PER_SEC</code>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The amount of processor time used so far by your program, in units
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defined by the machine-dependent macro <code>CLOCKS_PER_SEC</code>. If no
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measurement is available, the result is (clock_t)<code>-1</code>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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ANSI C requires <code>clock</code> and <code>CLOCKS_PER_SEC</code>.
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</p>
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<p>Supporting OS subroutine required: <code>times</code>.
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</p>
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<br>
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</body>
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</html>
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