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WDFREQUESTs are for sharing in KMDF v1.9

In my last post I described why a WDFREQUEST is unique to a particular WDFDEVICE.  There is one particular programming pattern where this is not the behavior you want.  This pattern is when you have each PDO accepting IO requests which it then Read More...
Posted Thursday, March 05, 2009 1:48 PM by doronh | 2 Comments
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How to share HW resources with another driver not in the same PnP hierarchy

First, I have to say that I don't agree with this design pattern at all . I think it leads to too many problems and complications that are not worth the pain. The only reason I am writing this entry is that I have seen so many people get this wrong or Read More...
Posted Wednesday, October 24, 2007 3:56 PM by doronh | 1 Comments
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Supporting query interface in KMDF

In my last post I talked about bidirectional interfaces which can have both input and output parameters. KMDF supports both unidirectional and bidirectional interfaces. As is the case with many KMDF APIs and behaviors, we allow you to implement the easy Read More...
Posted Monday, March 12, 2007 11:25 AM by doronh | 0 Comments
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