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13
14<h1>OSSetSwitchThreadCallback</h1>
15
16<h2>Syntax</h2>
17<dl><dd><pre class="construction">
18#include &lt;revolution/os.h&gt;
19
20typedef void (*OSSwitchThreadCallback)(OSThread* from, OSThread* to);
21
22OSSwitchThreadCallback
23    OSSetSwitchThreadCallback( OSSwitchThreadCallback callback );
24</pre></dd></dl>
25
26<h2>Arguments</h2>
27<TABLE class="arguments" border="1" >
28  <tr>
29<TH>callback</TH>
30<TD>Callback function to call whenever a thread context switch occurs. Specify <code>NULL</code> to unregister the callback function.</TD>
31  </tr>
32</TABLE>
33
34<h2>Return Values</h2>
35<P>The previous thread switch callback.</P>
36
37<h2>Description</h2>
38<P>Registers a specified callback function. This callback function is called whenever a thread context switch occurs.</P>
39<P><SPAN class="argument">callback</SPAN> takes 2 arguments. <SPAN class="argument">from</SPAN> is a pointer to the previously running thread. <SPAN class="argument">to</SPAN> is a pointer to the next running thread. If there is no thread ready to run, either <SPAN class="argument">from</SPAN> or <SPAN class="argument">to</SPAN> will be <CODE>NULL</CODE>.</P>
40
41<h2>See Also</h2>
42<P class="reference">
43<a href="../toc.html#Thread" target="contents">Thread Functions</a>,
44<a href="../toc.html#ThreadSynchronization" target="contents">Thread Synchronization Functions</a>,
45<a href="OSCancelThread.html">OSCancelThread</a>,
46<a href="OSDetachThread.html">OSDetachThread</a>,
47<a href="OSExitThread.html">OSExitThread</a>,
48<a href="OSIsThreadTerminated.html">OSIsThreadTerminated</a>
49</p>
50
51<H2>Revision History</H2>
52<P>
532006/03/01 Initial version.<br>
54</P>
55
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