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<title>7.8 Scheduling kernels</title>

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<h2>
  <a name="1102551"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">7.8 	 Scheduling kernels</font>
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  <a name="1102552"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">A scheduling kernel can be written to override the default scheduling behavior of the ST20-C1, but still using the very fast micro-code scheduling. The basis of such a scheduler would be trap handlers to trap the system exceptions <span class=Signal>el_idle_trap</span>, <span class=Signal>el_run_trap</span>, <span class=Signal>el_stop_trap</span>, <span class=Signal>el_timeslice_trap</span> and <span class=Signal>el_schedule_exception_trap</span>. When these traps are taken, a scheduling event is due or the processor has become idle. The trap replaces the default scheduling action. When the trap handler returns, the CPU will continue with the next instruction. Traps are described in <a href="except.htm#1102566"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Chapter

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