Re: Messages between Threads
Re: Messages between Threads
- Subject: Re: Messages between Threads
- From: Michael Ash <email@hidden>
- Date: Mon, 16 Mar 2009 10:35:26 -0400
On Mon, Mar 16, 2009 at 1:43 AM, Gerriet M. Denkmann
<email@hidden> wrote:
>
> On 15 Mar 2009, at 15:43, Joar Wingfors <email@hidden> wrote:
>>
>> On 15 mar 2009, at 01.14, Paul Sanders wrote:
>>
>>> I was referring to where the OP said:
>>>
>>>> "but would it be safe, given the fact that sum and count are bound
>>>> to some textFields / progressIndicator"
>>>>
>>> And presumably it would not be as the instance variables referred to
>>> were being mutated in a secondary thread.
>>
>>
>> That's right. If you've established bindings to some property of an
>> object, it's no longer OK to update that property from background
>> threads.
>>
>> Please refer to the Cocoa thread safety documentations:
>>
>>
>> <http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/Introduction/Introduction.html
>
> Could you please point to the exact section where it is stated that it is
> not OK to update a bound property from a background thread?
It's a consequence of several distinct facts:
1) It is not safe to update a control from a background thread.
2) Bound controls update when KVO notifications fire for the property
in question.
3) KVO notifications fire synchronously on whatever thread is updating
the property.
Mike
_______________________________________________
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