From: Maxim S. Shatskih [maxim@storagecraft.com]
Sent: Saturday, January 27, 2001 11:34 AM
To: NT Developers Interest List
Subject: [ntdev] Re: DPC question

>system will continue executing the ISR (at DISPATCH_LEVEL) and my DPC
>is ready to be executed.

>When exactly this will be execued ? As I complete my ISR (that means when
>the system goes back to PASSIVE_LEVEL) ? So, what triggers the execution
>of the DPC ?

Trying to drop the IRQL below DISPATCH_LEVEL will trigger the execution of
all DPCs pending on the processor.
This can occur:
- in the ISR epilog (if PASSIVE_LEVEL or APC_LEVEL code was interrupted).
- in KeReleaseSpinLock (which calls KeLowerIrql internally).
- in explicit KeLowerIrql (which is a rare thing).

    Max


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