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 forwards on to the parent WDFDEVICE for processing. One great in box…

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WDFREQUESTs are not for sharing

FYI: this is a bit of a long post, but I wanted to be thorough and illustrative and give some insight into how the framework works and potential design that could have been made, but were not for the sake of simplicity and performance A common misconception a WDFREQUEST handle is the assumption that the…

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Great WinHEC presentation on device interfaces compared to device clases

[This is a repeat of a post I made to NTDEV, but I wanted to make sure I reached as many people as possible.]   I just read this deck, http://download.microsoft.com/download/5/E/6/5E66B27B-988B-4F50-AF3A-C2FF1E62180F/CON-T615_WH08.pptx, which was presented at WinHEC this past year.  It is by far the best explanation of device interfaces and device classes that I have…

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MSDN link on how to set up a user or kernel debugger

This has got to be one of the top FAQs out there: how do I set up a kernel debugger?  I just stumbled across a link on MSDN which gives instructions not only on how to set up a kernel debugger on all transports (serial, 1394, usb2), but also how to set up a user…

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Dude, what happened to Doron?

So, I have not written anything in over 6 months and yet I have posted on NTDEV and public newsgroups. What gives?  Well, the short answer is that I have been short on time these past few months.  I have had only enough extra curricular time to read NTDEV and occassionally the newsgroups. Why? Well,…

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