> >> On 27 Jul 2016, at 10:05, Trygve Inda <cocoa...@xericdesign.com> wrote: >> >>> >> >> How is it retained by the main thread without an explicit retain call? > > are you not using ARC? If you are then all such references, both variable and > during method calls are retained automatically. If you’re not, then do what > ARC does and retain it explicitly and release it explicitly (and start using > ARC in that case!)
This is non-ARC code. It is a large project and convertig to ARC is a huge amount of work. >> >> I would be no different than a main thread calling: >> >> someVar [[MyObj alloc] init] >> [someVar doSomething]; > > That isn’t compilable code. Did you mean > > someVar = [ [ MyObj alloc]init ] > [ someVar doSomething ]; Yes. > > Again if you’re using ARC, none of these issues are issues. > > Why would a worker thread call [ someVar release ] on a variable it didn’t > retain in the first place? If that’s actually a realistic scenario and you’re > not using ARC, then call retain on someVar when you assign it in the first > place and release it only after you’re finished with it, after the call to > doSomething. Which, by the way, is pretty much what ARC does. I would think that even with a retain it could get weird... The main thread wants to use the imageRef property so it calls: myRef = [window.imageRef]; [myref retain]; If right between these calls, the worker thread calls setImageRef (on a property with atomic, copy), then the retain call in the main thread might be on something that has already gone away. I just don't see how I can safely set the property on a worker thread and read it on the main thread without some risk of it being released behind my back. _______________________________________________ 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
