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Re: async NSOperation and NSOperationQueue
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Re: async NSOperation and NSOperationQueue


  • Subject: Re: async NSOperation and NSOperationQueue
  • From: Quincey Morris <email@hidden>
  • Date: Mon, 15 Sep 2008 15:18:10 -0700

On Sep 15, 2008, at 14:35, Ken Thomases wrote:

It's possible that it's not safe to release a NSOperation until after it returns YES to [NSOperation isFinished].

I don't think there needs to be anything specific in the documentation. In the absence of a documented exception, we should assume it follows the usual Cocoa memory management conventions. That is, if you need to continue to access the NSOperation, you need to hold ownership of it. If you don't care about accessing it in the future, you need not. The NSOperationQueue is expected to do whatever is necessary for it to carry out its responsibilities. If it needs to retain the NSOperation objects, and we can guess that it probably does need that, it will. You, as a client, shouldn't care though.

The question is not really about what NSOperationQueue does, but whether it's safe to release a NSOperation while it's executing. If not (as seems likely), then even if you don't otherwise care about accessing it in the future, you must not release it until 'isFinished' returns YES.


In the absence of documented details, therefore, you can neither rely on NSOperationQueue to keep it alive nor release it yourself until it's finished, which is a bit more restrictive than what you said above.


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  • Follow-Ups:
    • Re: async NSOperation and NSOperationQueue
      • From: Ken Thomases <email@hidden>
References: 
 >Re: async NSOperation and NSOperationQueue (From: John Love <email@hidden>)
 >Re: async NSOperation and NSOperationQueue (From: Jason Coco <email@hidden>)
 >Re: async NSOperation and NSOperationQueue (From: Quincey Morris <email@hidden>)
 >Re: async NSOperation and NSOperationQueue (From: Ken Thomases <email@hidden>)

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