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20

answers:

1
Q: 

Autorelease pools in appkit applications

I'm having difficulties to understand exactly WHEN autorelease pools are created and released in AppKit apps.

For example, if I have an ApplicationController class that overrides init, is there an autorelease pool that gets created before it starts and gets drained after it ends?

+1  A: 

The main thread in an AppKit application runs an NSRunLoop to process events. NSRunLoop creates a new autorelease pool every time it processes a new event (or timer) and drains it once control flow has returned to the NSRunLoop. So in essence, every pass through the run loop has a fresh autorelease pool.

Kevin Ballard  2010-10-28 22:35:12
So when will objects created in init be released? O:-)
Fernando  2010-10-28 22:36:48
Once you've started the runloop, if you autorelease anything, it will get released once control flow returns to the runloop. The only exceptions are if you autorelease something inside of `main()` (which is outside of the run loop) or in another thread.
Kevin Ballard  2010-10-28 22:50:42
Fernando: They will be released when they are released. Objects you add to an autorelease pool are released when the pool drains. A pool you create drains when you drain it; a pool created by the run loop drains when… well, the answer tells you that.
Peter Hosey  2010-10-29 19:39:04

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