January 2004
Intermediate to advanced
432 pages
11h 1m
English
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The Callout Table
The kernel sometimes needs to be able to schedule events to happen in the future. For example, a driver might want a timeout on an I/O operation. The driver starts an I/O and is interrupted by the I/O system when the I/O completes, but if for some reason the I/O doesn't complete, the driver needs to know about that too. The driver sets a callout for some number of ticks in the future, specifying a routine to be called at that time. If the I/O completes successfully, then the callout is cancelled. If the callout routine gets called, then the driver knows something went wrong.
Interface
The basic function for setting a timeout is called timeout(). It takes three arguments: a pointer to a function to call, a void* argument to pass ...
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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.