inst_s71.htm

来自「ST20 Embedded Toolset R2.0.5用于开发基于ST20芯片」· HTM 代码 · 共 84 行

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<h2>
  <a name="1103051"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">timeslice</font>
</h2><hr>


<p>
  <a name="1103053"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">timeslice</font>
</p>


<h5>
  <a name="1105375"> </a><i><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Code</font></i>
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<p>
  <a name="1103054"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">FE</font>
</p>


<h5>
  <a name="1106161"> </a><i><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Description</font></i>
</h5>


<p>
  <a name="1103055"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Deschedules the current process and starts the next task if a timeslice is due and timeslicing is enabled. This instruction is implemented in two stages to protect interrupt latency. The first stage deschedules the current process (even if the queue is empty), adds it to the back of the scheduling queue and sets the <span class=Signal>start_next_task</span> status bit. The second stage clears the <span class=Signal>start_next_task</span> status bit and starts the next process from the scheduling queue. An interrupt may occur between the two stages.</font>
</p>


<p>
  <a name="1137923"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The <span class=Signal>tdesc </span>register should always be initialized, even if a timeslice trap is installed. When a timeslice trap is taken, the process descriptor block (that is, the data structure pointed to by <span class=Signal>tdesc</span>) becomes undefined (may be overwritten).</font>
</p>


<h5>
  <a name="1108207"> </a><i><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Definition</font></i>
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<p>
  <a name="1135763"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">if ( <span class=Signal>Status</span> <sub>timeslicing enabled</sub> and <span class=Signal>Status</span> <sub>timeslice_count</sub>=0 )<br>{<br>

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