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<title>11.2.6 Unknown tasks  </title>

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  <a name="1204538"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">11.2.6 	 Unknown tasks</font>
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  <a name="1204539"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">One problem which is frequently seen when debugging programs is that of an "Unknown task". This occurs because of the way the OS20 task awareness code in <strong>st20run</strong> scans the data structures on the target. It does this in two passes.</font>
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<p>  <font size=2  face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204543"> </a>First it extracts the names of all the tasks in the system.</font></p>
<p>  <font size=2  face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204544"> </a>Secondly it examines all the data structures which a task could be blocked on, to update the task's state.</font></p>
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  <a name="1204545"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">If a task is found in the second pass, which was not found in the first, then the code cannot know the task's name, and invents a task name of the form:</font>
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<a name="1204546"> </a><font size=2 face=Courier><strong>Unknown[<font size=2 face=Courier><strong><em>n</em></strong></font>]<br></strong></font>



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  <a name="1204547"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">where <font size=2 face=Courier><strong><em>n</em></strong></font> is a unique task identifier used by the debugger.</font>
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  <a name="1204548"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Normally unknown tasks are caused by an error in the target code, the most common causes being a corrupted data structure, a stack overflow, or <strong>st20run</strong> being unable to read target memory or registers (for example for the interrupt controller).</font>
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