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6.6 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>The Be Book - Classes And Methods - The Kernel Kit</title><link rel="stylesheet" href="be_book.css" type="text/css" media="all" /><link rel="shortcut icon" type="image/vnd.microsoft.icon" href="./images/favicon.ico" /><!--[if IE]>
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<![endif]--><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /><meta name="keywords" content="Access, BeOS, BeBook, API" /><link rel="start" href="index.html" title="The Be Book" /><link rel="up" href="TheKernelKit.html" title="The Kernel Kit" /><link rel="prev" href="TheKernelKit_ThreadsAndTeams.html" title="Threads And Teams" /><link rel="next" href="TheKernelKit_SystemInfo.html" title="System Information" /></head><body><div id="header"><div id="headerT"><div id="headerTL"><a accesskey="p" href="TheKernelKit_ThreadsAndTeams.html" title="Threads And Teams"><img src="./images/navigation/prev.png" alt="Prev" /></a> <a accesskey="u" href="TheKernelKit.html" title="The Kernel Kit"><img src="./images/navigation/up.png" alt="Up" /></a> <a accesskey="n" href="TheKernelKit_SystemInfo.html" title="System Information"><img src="./images/navigation/next.png" alt="Next" /></a></div><div id="headerTR"><div id="navigpeople"><a href="http://www.haiku-os.org"><img src="./images/People_24.png" alt="haiku-os.org" title="Visit The Haiku Website" /></a></div><div class="navighome" title="Home"><a accesskey="h" href="index.html"><img src="./images/navigation/home.png" alt="Home" /></a></div><div class="navigboxed" id="navigindex"><a accesskey="i" href="ClassIndex.html" title="Index">I</a></div><div class="navigboxed" id="naviglang" title="English">en</div></div><div id="headerTC">The Be Book - Classes And Methods - The Kernel Kit</div></div><div id="headerB">Prev: <a href="TheKernelKit_ThreadsAndTeams.html">Threads And Teams</a> Up: <a href="TheKernelKit.html">The Kernel Kit</a> Next: <a href="TheKernelKit_SystemInfo.html">System Information</a></div><hr /></div><div class="section"><div xmlns="" xmlns:d="http://docbook.org/ns/docbook" class="titlepage"><div><div xmlns:d="http://docbook.org/ns/docbook"><h2 xmlns="http://www.w3.org/1999/xhtml" class="title"><a id="TheKernelKit_Time"></a>Time Information</h2></div></div></div><div class="informaltable"><table border="0"><colgroup><col /><col /></colgroup><tbody><tr><td>Declared in:</td><td><code class="filename">kernel/OS.h</code></td></tr><tr><td>Library:</td><td><code class="filename">libroot.so</code></td></tr></tbody></table></div><div class="section"><div xmlns="" xmlns:d="http://docbook.org/ns/docbook" class="titlepage"><div><hr /><div xmlns:d="http://docbook.org/ns/docbook"><h3 xmlns="http://www.w3.org/1999/xhtml" class="title"><a id="Time_TimeFunctions"></a>Time Functions</h3></div></div></div><div class="section"><div xmlns="" xmlns:d="http://docbook.org/ns/docbook" class="titlepage"><div><div xmlns:d="http://docbook.org/ns/docbook"><h4 xmlns="http://www.w3.org/1999/xhtml" class="title"><a id="real_time_clock"></a><a id="real_time_clock_usecs"></a>
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<a id="set_real_time_clock"></a>
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real_time_clock(), real_time_clock_usecs(), set_real_time_clock()</h4></div></div></div><a id="id1112792" class="indexterm"></a><a id="id1112799" class="indexterm"></a><a id="id1112806" class="indexterm"></a><code class="methodsynopsis c"><span class="type">uint32 </span><span class="methodname">real_time_clock</span>();</code><code class="methodsynopsis c"><span class="type">bigtime_t </span><span class="methodname">real_time_clock_usecs</span>();</code><code class="methodsynopsis c"><span class="type">void </span><span class="methodname">set_real_time_clock</span>(<span class="methodparam"><span class="type">int32 </span><span class="parameter">secs_since_jan1_1970</span></span>);</code><p><code class="function">real_time_clock()</code> returns the number of seconds that have elapsed since
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January 1, 1970.</p><p><code class="function">real_time_clock_usecs()</code> measures the same time span in microseconds.</p><p><code class="function">set_real_time_clock()</code> sets the value that the other two functions refer
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to.</p></div><div class="section"><div xmlns="" xmlns:d="http://docbook.org/ns/docbook" class="titlepage"><div><div xmlns:d="http://docbook.org/ns/docbook"><h4 xmlns="http://www.w3.org/1999/xhtml" class="title"><a id="system_time"></a>system_time()</h4></div></div></div><a id="id1112899" class="indexterm"></a><code class="methodsynopsis c"><span class="type">bigtime_t </span><span class="methodname">system_time</span>();</code><p>Returns the number of microseconds that have elapsed since the computer
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was booted.</p></div></div></div><div id="footer"><hr /><div id="footerT">Prev: <a href="TheKernelKit_ThreadsAndTeams.html">Threads And Teams</a> Up: <a href="TheKernelKit.html">The Kernel Kit</a> Next: <a href="TheKernelKit_SystemInfo.html">System Information</a> </div><div id="footerB"><div id="footerBL"><a href="TheKernelKit_ThreadsAndTeams.html" title="Threads And Teams"><img src="./images/navigation/prev.png" alt="Prev" /></a> <a href="TheKernelKit.html" title="The Kernel Kit"><img src="./images/navigation/up.png" alt="Up" /></a> <a href="TheKernelKit_SystemInfo.html" title="System Information"><img src="./images/navigation/next.png" alt="Next" /></a></div><div id="footerBR"><div><a href="http://www.haiku-os.org"><img src="./images/People_24.png" alt="haiku-os.org" title="Visit The Haiku Website" /></a></div><div class="navighome" title="Home"><a accesskey="h" href="index.html"><img src="./images/navigation/home.png" alt="Home" /></a></div></div><div id="footerBC"><a href="http://www.access-company.com/home.html" title="ACCESS Co."><img alt="Access Company" src="./images/access_logo.png" /></a></div></div></div><div id="licenseFooter"><div id="licenseFooterBL"><a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/" title="Creative Commons License"><img alt="Creative Commons License" style="border-width:0" src="https://licensebuttons.net/l/by-nc-nd/3.0/88x31.png" /></a></div><div id="licenseFooterBR"><a href="./LegalNotice.html">Legal Notice</a></div><div id="licenseFooterBC"><span id="licenseText">This work is licensed under a
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Commons Attribution-Non commercial-No Derivative Works 3.0 License</a>.</span></div></div></body></html>
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