On May 18, 2015, at 16:25 , Britt Durbrow <bdurb...@rattlesnakehillsoftworks.com> wrote: > > If some objects are in autorelease pools, that means that there is a strong > link to them out there somewhere (presumably on the stack or in a register > where it’s going to go away once the stack frames get popped) and the object > pool controller shouldn’t let go of the object yet. Hopefully there will be > enough else that can be released that the memory pressure gets satisfied. > Also, I can set a flag to cause the object pool controller to re-scan the > pool for objects to release after the main autorelease pool is drained in the > main event loop.
But here we go, reasoning about retain counts — incorrectly. (Your first sentence is just false, BTW, not incorrectly reasoned. An object can be in an autorelease pool with no other strong link anywhere.) And you’ve got me doing it too. What I said previously about retain counts of objects in autorelease pools was just wrong. > why I can’t have the object pool controller just drop an object unless the > pool controller is the only one with a strong link to the object. Because what you really want is “unless the pool controller is the only one with an accessible link to the object”. You’re trying hard to force “strong link” to do the duty of “accessible link”, and I’m trying hard to tell you that it can’t. Also, I’m not trying to steer you towards the double pointer approach. Paradoxical as it may seem, I’m suggesting you can avoid that by merely incrementing the retain count of objects you *know* to be accessible, and to decrement it when you *know* they become inaccessible. You can reason about *that* retain count (“it keeps objects alive when present”). You just can’t validly reason about anyone else’s retain counts. :) _______________________________________________ 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
