Re: Open a panel in secondary thread?
Re: Open a panel in secondary thread?
- Subject: Re: Open a panel in secondary thread?
- From: Alex Zavatone via Cocoa-dev <email@hidden>
- Date: Mon, 23 Mar 2020 15:25:00 +0000
Main queue is analogous to the main thread, but not exactly the same -
according to Apple’s docs.
Sent from my iPhone
> On Mar 23, 2020, at 12:53 PM, Gabriel Zachmann via Cocoa-dev
> <email@hidden> wrote:
>
> Thanks a lot for your response.
>
>> I would not do this. It is widely documented that AppKit API that produce
>> UI elements, like NSOpenPanel, are _not_ thread safe.
>
> Right, and that is why I have to execute any UI code in the main thread,
> or so I thought.
> As far as I understand, the dispatch_get_main_queue is executed by the main
> thread, isn't it?
>
>
>> So you may find your app hitting some memory stomping issues or strange
>> crashes/exceptions due to this. Specifically what problems you will hit are
>> anyones guess, but its just a matter of time. There is a reason Xcode has
>> the Main Thread Checker to catch UI elements being used on secondary threads.
>>
>> Lets come at this from a different direction: What are you trying to do?
>> Why do you think you need to use the open panel on a secondary thread?
>
> When the user selects a directory, I collect all files in that sub-tree (aka
> "scan").
> That might involve aliases. which means I need to ask the user to open the
> directory that alias points to.
> Because that scan can take several seconds (10-20),
> I wanted to do that scan in a secondary thread so that it can update progress
> info in the UI.
>
> Best regards, Gabriel
>
> _______________________________________________
>
> Cocoa-dev mailing list (email@hidden)
>
> Please do not post admin requests or moderator comments to the list.
> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>
> Help/Unsubscribe/Update your Subscription:
>
> This email sent to email@hidden
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden