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Cocoa Programming for OS X: The Big Nerd Ranch Guide by Aaron Hillegass, Adam Preble, Nate Chandler

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34 Concurrency

All of the applications you have written as you have worked through this book have been single-threaded. In simplistic terms, this means that only one thing is happening in the application at any given time, such as responding to a button click, updating the display, or counting the number of objects in an array.

Of course, in some cases it is very useful to be able to do many things at once. In a modern OS, each application is running in its own process; this division gives each application its own memory space, but it also allows the task scheduler to create the illusion that many applications are running at once.

Multithreading

Threads give this same power to individual processes. Each thread in ...

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