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<h2>
<span class="refentrytitle">clockon</span>
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<p>clockon —
Starts one of a number of internal clocks.
</p>
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<div class="refsect1" title="Description">
<a id="idp16144056"></a>
<h2>Description</h2>
<p>
Starts one of a number of internal clocks.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp16144712"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>clockon</strong></span> inum</pre>
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<div class="refsect1" title="Initialization">
<a id="idp16188696"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>inum</em></span> -- the number of a clock. There are 32 clocks numbered 0 through 31. All other values are mapped to clock number 32.
</p>
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<div class="refsect1" title="Performance">
<a id="idp16189632"></a>
<h2>Performance</h2>
<p>
Between a <span class="emphasis"><em>clockon</em></span> and a <a class="link" href="clockoff.html" title="clockoff"><em class="citetitle">clockoff</em></a> opcode, the CPU time used is accumulated in the clock. The precision is machine dependent but is the millisecond range on UNIX and Windows systems. The <a class="link" href="readclock.html" title="readclock"><em class="citetitle">readclock</em></a> opcode reads the current value of a clock at initialization time.
</p>
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<div class="refsect1" title="Examples">
<a id="idp16191640"></a>
<h2>Examples</h2>
<p>
Here is an example of the clockon opcode. It uses the file <a class="ulink" href="examples/clockon.csd" target="_top"><em class="citetitle">clockon.csd</em></a>.
</p>
<div class="example">
<a id="idp16192616"></a>
<p class="title">
<strong>Example 114. Example of the clockon opcode.</strong>
</p>
<div class="example-contents">
<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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o clockon.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 1
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Start clock #1.</span>
<span class="opc">clockon</span> 1
<span class="comment">; Do something that keeps Csound busy.</span>
a1 <span class="opc">oscili</span> 10000, 440, 1
<span class="opc">out</span> a1
<span class="comment">; Stop clock #1.</span>
<span class="opc">clockoff</span> 1
<span class="comment">; Print the time accumulated in clock #1.</span>
i1 <span class="opc">readclock</span> 1
<span class="opc">print</span> i1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Initialize the function tables.</span>
<span class="comment">; Table 1: an ordinary sine wave.</span>
<span class="stamnt">f</span> 1 0 32768 10 1
<span class="comment">; Play Instrument #1 for one second starting at 0:00.</span>
<span class="stamnt">i</span> 1 0 1
<span class="comment">; Play Instrument #1 for one second starting at 0:01.</span>
<span class="stamnt">i</span> 1 1 1
<span class="comment">; Play Instrument #1 for one second starting at 0:02.</span>
<span class="stamnt">i</span> 1 2 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp16193632"></a>
<h2>See Also</h2>
<p>
<a class="link" href="clockoff.html" title="clockoff"><em class="citetitle">clockoff</em></a>, <a class="link" href="readclock.html" title="readclock"><em class="citetitle">readclock</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp16195112"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>University of Bath/Codemist Ltd.</td>
</tr>
<tr>
<td>Bath, UK</td>
</tr>
<tr>
<td>July, 1999</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.56</p>
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