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March 2008 - Posts

Monday, March 31, 2008 7:04 PM

Why Your User Mode Pointer Captures Are Probably Broken

There is a problem that I suspect is pretty widespread in the majority of driver code. The problem is the improper capturing of user mode pointers. I decided to write a blog about it and try to get a feel for if I am right or not. J I figure that if people
Posted by theelvez | 9 Comments
Sunday, March 16, 2008 11:03 PM

How Does KeMemoryBarrier Work?

KeMemoryBarrier is a kernel DDK support macro. There is also a WIN32 macro called MemoryBarrier that is implemented identically (there is an observance test hidden here!) - so we will just talk about KeMemoryBarrier here, but everything we say about it
Posted by theelvez | 4 Comments
Tuesday, March 11, 2008 12:55 AM

The Joys of Compiler and Processor Reordering: Why You Technically Need Read-Side Barriers

In a previous post on compiler and processor reordering, I said that for multi-threaded, lock-free code to be totally correct - you need a barrier on the read sides of the code - but that it was pretty complicated and wasn't required on any processors
Posted by theelvez | 29 Comments
Friday, March 07, 2008 2:11 AM

The Joys of Compiler and Processor Reordering

So I thought that a good first technical blog entry would be one about a common – but “hardly thought about by most programmers” problem called “reordering”. It is a subtle problem but very important to understand if you write lock-less multithreaded
Posted by theelvez | 10 Comments
Tuesday, March 04, 2008 8:44 PM

It Goes to Eleven

I am brand new to the world of blogs so I apologize in advance to any one that reads this blog. Please let me know if I am doing something rude or ignorant. :) "Allow myself to .. introduce ... myself ..." My name is Jonathan Morrison and I work on the
Posted by theelvez | 3 Comments
Saturday, March 01, 2008 5:40 AM

Hello World!

Well - you have to do it don't you?
Posted by theelvez | 1 Comments
 
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