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Re: Multithreaded Cocoa Document Application?
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Re: Multithreaded Cocoa Document Application?


  • Subject: Re: Multithreaded Cocoa Document Application?
  • From: Andrew Merenbach <email@hidden>
  • Date: Mon, 27 Aug 2007 10:22:38 -0700

Ah, right, Distributed Objects.... that's where I got confused.

Cheers,
	Andrew

On Aug 27, 2007, at 10:15 AM, Uli Kusterer wrote:

On 24.08.2007, at 03:11, Andrew Merenbach wrote:
I'm not an expert on interthread communication, but I believe that you may wish to look into NSDistributedNotifications for this:

Distributed *objects* were the old way to do this, maybe you were thinking of that? But I vaguely remember having heard that it was not recommended to use DO for inter-thread communication these days. performSelectorOnMainThread: and similar NSThread-related methods are apparently what one should use these days.


As others have said, while BeOS was apparently designed so you could have entire windows run on separate threads, in Cocoa and AppKit you're generally encouraged to use locks (or @synchronized), and to only start a particular *operation* on separate threads. Just kicking off a thread when needed and sending a message to the main thread occasionally for progress information or to indicate you've finished should be the easiest way to not block the UI and still do work in the background. Having some kind of message queue can come in handy there if you do this frequently and with lots of small operations, or interdependent operations, or with several tasks across different documents, and you want to start only as many as you have CPUs or so.

Cheers,
-- M. Uli Kusterer
http://www.zathras.de




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References: 
 >Multithreaded Cocoa Document Application? (From: "Rick Ekle" <email@hidden>)
 >Re: Multithreaded Cocoa Document Application? (From: Andrew Merenbach <email@hidden>)
 >Re: Multithreaded Cocoa Document Application? (From: Uli Kusterer <email@hidden>)

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