October 2003
Intermediate to advanced
1072 pages
24h 21m
English
Content preview from Guru's Guide to SQL Server Architecture and Internals, TheBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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User Mode vs. Kernel Mode
In order to keep misbehaving application code from destabilizing the system, Windows uses two processor modes: user mode and kernel mode. User application code runs in user mode; OS code and device drivers run in kernel mode. Kernel mode has a higher hardware privilege level than user mode and provides access to all system memory and all CPU instructions. By running at a higher privilege than application software, Windows can keep a misbehaving application from directly destabilizing the system.
The Intel x86 family of processors actually supports four operating modes (also known as rings). These are numbered 0 through 3, and each is isolated from the others by the hardware—a crash in a lower-priority mode will not destabilize ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.