Re: Telling Auto Save, "No, I'm busy now"
Re: Telling Auto Save, "No, I'm busy now"
- Subject: Re: Telling Auto Save, "No, I'm busy now"
- From: Jerry Krinock <email@hidden>
- Date: Thu, 04 Aug 2011 08:19:40 -0700
On 2011 Aug 04, at 07:53, Ken Thomases wrote:
> On Aug 4, 2011, at 8:54 AM, Jerry Krinock wrote:
>
>> I'm getting a crash if I begin some operations and then hit the 'close' button on the window while the operations are in progress…
>>
>> I take the four parameters I receive in saveToURL:ofType:forSaveOperation:completionHandler: and put them into a dictionary in an NSOperation, and throw this operation onto the end my operation queue. (This project was written back in 10.5 so it does not use GCD.)
>
> Did you copy the block, or did you just add it to the dictionary as a value (which just retains it)?
The latter, Ken. I didn't mention that I was a newbie on Blocks, having just read "Blocks Programming Topics" yesterday. "Copying Blocks" was near the end … looks like I must have fallen asleep.
> This suggests that you didn't copy it. Thus, the above is the first time it has been copied, which attempts to relocated it off of its original stack frame and into the heap. However, that stack frame is long gone and no longer valid.
Yup.
> Blocks have special memory management requirements and retaining is not sufficient if the block is to survive its original stack frame.
OK, I'll go do the homework.
Thank you.
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