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 > <cocoa-dev@lists.apple.com> 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 (Cocoa-dev@lists.apple.com) > > 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: > https://lists.apple.com/mailman/options/cocoa-dev/zav%40mac.com > > This email sent to z...@mac.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
