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<div class="refentry" title="rtclock">
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<h2>
<span class="refentrytitle">rtclock</span>
</h2>
<p>rtclock —
Read the real time clock from the operating system.
</p>
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<div class="refsect1" title="Description">
<a id="idp41128768"></a>
<h2>Description</h2>
<p>
Read the real-time clock from the operating system.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp41129512"></a>
<h2>Syntax</h2>
<pre class="synopsis">ires <span class="command"><strong>rtclock</strong></span></pre>
<pre class="synopsis">kres <span class="command"><strong>rtclock</strong></span></pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp41140656"></a>
<h2>Performance</h2>
<p>
Read the real-time clock from operating system. Under Windows, this changes only once per second. Under GNU/Linux, it ticks every microsecond. Performance under other systems varies.
</p>
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<div class="refsect1" title="Examples">
<a id="idp41141664"></a>
<h2>Examples</h2>
<p>
Here is an example of the rtclock opcode. It uses the file <a class="ulink" href="examples/rtclock.csd" target="_top"><em class="citetitle">rtclock.csd</em></a>.
</p>
<div class="example">
<a id="idp41142648"></a>
<p class="title">
<strong>Example 734. Example of the rtclock opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-n <span class="comment">;;;no sound</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o rtclock.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">;after an example by Iain McCurdy</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="opc">FLcolor</span> 200, 200, 200, 0, 0, 0
<span class="comment">; LABEL | WIDTH | HEIGHT | X | Y</span>
<span class="opc">FLpanel</span> "rtclock", 500, 130, 0, 0
<span class="comment">; ON,OFF,TYPE,WIDTH, HEIGHT, X, Y, OPCODE, INS,START,IDUR</span>
gkOnOff,ihOnOff <span class="opc">FLbutton</span> "On<span class="op">/</span>Off", 1, 0, 22, 150, 25, 5, 5, 0, 1, 0, 3600
gkExit,ihExit <span class="opc">FLbutton</span> "exitnow",1, 0, 21, 150, 25, 345, 5, 0, 999, 0, 0.001
<span class="opc">FLsetColor2</span> 255, 0, 50, ihOnOff <span class="comment">;reddish color</span>
<span class="comment">;VALUE DISPLAY BOXES WIDTH,HEIGHT,X, Y</span>
gidclock <span class="opc">FLvalue</span> "clock", 100, 25, 200, 60
<span class="opc">FLsetVal_i</span> 1, ihOnOff
<span class="opc">FLpanel_end</span>
<span class="opc">FLrun</span>
<span class="oblock">instr</span> 1
<span class="octrl">if</span> gkOnOff <span class="op">!=</span>0 <span class="octrl">kgoto</span> <span class="olabel">CONTINUE</span> <span class="comment">;sense if FLTK on/off switch is not off (in which case skip the next line) </span>
<span class="opc">turnoff</span> <span class="comment">;turn this instr. off now</span>
<span class="olabel">CONTINUE</span><span class="op">:</span>
ktime <span class="opc">rtclock</span> <span class="comment">;clock continues to run even </span>
<span class="opc">FLprintk2</span> ktime, gidclock <span class="comment">;after the on/off button was used to stop</span>
<span class="oblock">endin</span>
<span class="oblock">instr</span> 999
<span class="opc">exitnow</span> <span class="comment">;exit Csound as fast as possible</span>
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span> 0 60 <span class="comment">;runs 60 seconds</span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="Credits">
<a id="idp41175720"></a>
<h2>Credits</h2>
<p>Author: John ffitch</p>
<p>New in version 4.10</p>
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