Re: [NSButton state] must by used from the main thread
Re: [NSButton state] must by used from the main thread
- Subject: Re: [NSButton state] must by used from the main thread
- From: Quincey Morris <email@hidden>
- Date: Tue, 26 Sep 2017 01:35:20 -0700
On Sep 26, 2017, at 01:16 , Tamas Nagy <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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