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Re: [NSButton state] must by used from the main thread
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Re: [NSButton state] must by used from the main thread


  • Subject: Re: [NSButton state] must by used from the main thread
  • From: Tamas Nagy <email@hidden>
  • Date: Tue, 26 Sep 2017 10:57:14 +0200

Makes sense, thanks Quincey.

Best,
Tamas

> On 2017. Sep 26., at 10:35, Quincey Morris
> <email@hidden> wrote:
>
> On Sep 26, 2017, at 01:16 , Tamas Nagy <email@hidden
> <mailto:email@hidden>> wrote:
>>
>> but “state” of the NSButton is a NSInteger property, so that should be safe
>> to read from a background thread, right?
>
> Not necessarily. If the setter is thread-unsafe, then it’s possible that the
> getter may retrieve an incorrect value.
>
> It’s not clear whether Apple has audited methods to determine thread safety
> (so that such reported errors represent an actual pitfall), or whether there
> is a general restriction on settable properties of UI objects. Either way,
> prudence dictates that you heed the warning and change the code.
>
> Now that I think about it, getting a button state on a background thread does
> seem like an odd thing to do. Except in the simplest of cases, it does seem
> to open up the possibility of race conditions, since the “when” of the value
> might matter, relative to the timing of the surrounding code.
>

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  • Follow-Ups:
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References: 
 >[NSButton state] must by used from the main thread (From: Tamas Nagy <email@hidden>)
 >Re: [NSButton state] must by used from the main thread (From: Quincey Morris <email@hidden>)

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