Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results


Before Posting...

Please check out the Community Guidelines in the Announcements and Administration Category.

More Info on Driver Writing and Debugging

The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.

Check out The OSR Learning Library at:

Fw: Re: About time spend when processing Dispatch routine-?

OSR_Community_UserOSR_Community_User Member Posts: 110,217
From: "Prekupec Boris" <[email protected]>
Sent: Tuesday, May 30, 2000 4:04 PM

> Matt and all others,
> I meant DPC routine(s) first as my driver doesn't require an interrupt
> device to process an I/O operation. It can catch interrupts event but I
> wasn't able to test that.

I see.

> So I have designed driver to work also through
> IOCTL codes with DeviceIoControl (don't recall the exact name) function
> call inside win32 application. As I presume that device doesn't rise
> interrupt I use DPCs as some kind of WatchDog timer.

I'm not quite sure I understand the situation you're describing but, yes,
direct calls from an application into your driver will occur at

> As other routines I also meant I/O routines (StarIo, AdapterControl etc.)
> But I think I have received all answers I needed,
> thanks to you all for your contribution,

Glad to help.

Just be careful in the future how you use the term "dispatch routine". To
most driver writers, this means an IRP_MJ_* handler which, as I described,
typically has nothing to do with execution at DISPATCH_LEVEL.

- Matt
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. Sign in or register to get started.

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Kernel Debugging 13-17 May 2024 Live, Online
Developing Minifilters 1-5 Apr 2024 Live, Online
Internals & Software Drivers 11-15 Mar 2024 Live, Online
Writing WDF Drivers 26 Feb - 1 Mar 2024 Live, Online