Re: drawing in a separate thread

FROM : Jean-Daniel Dupas
DATE : Fri May 02 18:04:02 2008

Le 2 mai 08 à 17:27, Jens Alfke a écrit :

>
> On 2 May '08, at 4:20 AM, Jean-Daniel Dupas wrote:
>

>> You can have a look at DistributedObject. I think you can publish a 
>> drawer object in your drawing thread and then, just call draw fro 
>> your main thread.

>
> DO might be overkill for this scenario. The background thread really 
> just needs to run a while() loop that waits on a condition-lock, 
> then draws. The main thread's -drawRect: method just sets the 
> condition on the lock to trigger the background thread.


You're right for the.


>
> If more information needs to be passed to the thread, you can use a 
> producer/consumer queue, but unfortunately Foundation doesn't come 
> with one of those built-in; there must be source code for one lying 
> around, though.
>
> —Jens


You're too. The Cocoa Threading Programmming Guide shows a way to 
implements producer/consumer using NSConditonalLock.
(http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/ThreadSafety/chapter_5_section_7.html
)