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<title>Scheduler State</title>
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<h2>Scheduler State</h2>
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<p>The first three lines and the fifth line of the output show the
state of the kernel scheduler. This information is mainly of interest to kernel
engineers, although the state of the kernel and the system locks can be useful
when debugging device driver crashes.</p>
<p class="listing">SCHEDULER @64000348: CurrentThread 640396b0<br>
RescheduleNeeded=00 DfcPending=00 KernCSLocked=00000001<br>DFCS: next 64000458 prev 64000458<br>...<br>SYSLOCK: HoldingThread 00000000 iWaiting 00000000</p>
<p>The values are interpreted as follows:</p><table cellpadding="1" border="0" cellspacing="0"><tr><td
class="TableWrap"><table cellpadding="5" cellspacing="1"
border="0"><tr valign="top"><td class="Cell">
<p>SCHEDULER @</p></td><td class="Cell">
<p>This is the address of the kernel’s scheduler instance; this
is not very useful.</p></td></tr>
<tr valign="top"><td class="Cell">
<p>CurrentThread</p></td><td class="Cell">
<p>The address of the kernel object for the current kernel
thread.</p></td></tr>
<tr valign="top"><td class="Cell">
<p>RescheduleNeeded</p></td><td class="Cell">
<p>This is set to non-zero by the kernel to force a reschedule,
for example if a thread has been signalled</p></td></tr>
<tr valign="top"><td class="Cell">
<p>DfcPending</p></td><td class="Cell">
<p>This is non-zero when there are DFCs queued.</p></td></tr>
<tr valign="top"><td class="Cell">
<p>KernCSLocked</p></td><td class="Cell">
<p>This is incremented each time the kernel is locked by a call
to NKern::Lock(), and decremented by calls to NKern::Unlock(). A value of zero means that the kernel is
not locked.</p></td></tr>
<tr valign="top"><td class="Cell">
<p>DFCS:</p></td><td class="Cell">
<p>The addresses of the next and the previous items on the DFC
queue</p></td></tr>
<tr valign="top"><td class="Cell">
<p>HoldingThread</p></td><td class="Cell">
<p>The address of the thread holding the system lock mutex. The
system lock is set by call to NKern::LockSystem() and
unset by call to NKern::UnlockSystem()</p></td></tr>
<tr valign="top"><td class="Cell">
<p>iWaiting</p></td><td class="Cell">
<p>Non-zero, if any thread is waiting for the system lock
mutex.</p></td></tr>
</table></td></tr></table>
<p> </p>
</div>
<h5>Related tasks</h5>
<ul>
<li><a href="CrashDebuggerInfoAboutKernel.guide.html">Extracting Kernel Information</a> </li>
<li><a href="CrashDebuggerInfoAboutKernel.guide03.html">Current Thread State</a></li>
<li><a href="CrashDebuggerInfoAboutKernel.guide04.html">Current Process State</a></li>
<li><a href="CrashDebuggerInfoAboutKernel.guide05.html">Current Data Section Process</a></li>
</ul>
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