April 2012
Intermediate to advanced
196 pages
4h 42m
English
Content preview from Pro Multithreading and Memory Management for iOS and OS X
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Chapter 8
GCD Implementation
In this chapter, I explain how GCD is implemented in order to give you a better understanding of how it works. And then I explain one functionality of GCD called “data source,” which relates to the XNU kernel event.
Dispatch Queue
This section shows how GCD is implemented. We especially look at the GCD structure and then see how a Block is executed on the dispatch queue.
Kernel-Level Implementation
From its functionality, we can guess that GCD uses the following components.
- A FIFO queue in the C language-level to manage the added Blocks
- Lightweight semaphore for concurrency control by atomic functions
- A container in the C language-level to manage threads
If that is all, it doesn’t need kernel-level implementation. ...
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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.