Apple

On Nov 10, 2005, at 10:21 AM, Philip Lukidis wrote:

Hi Garth, thanks for your answer. Sorry about that bad link, it should point to:

-Multithreading Topics -> Thread packages -> POSIX Threads, and the quote is:

"For example, unlike other threading packages, a POSIX thread does not automatically associate itself with your application’s run loop."

I agree with Shawn--I really don't understand the point of this sentence. Could you please file a bug report asking that this language be made clearer?

I can guess that they're trying to point out that the Cocoa threading model, for example, can explicitly run any code on the main thread even if initiated from another thread. If you are using naked pthreads and want to do UI, you'd have to work out your own rendezvous mechanism with your main thread to have it run the UI.

Note that it doesn't say that a pthread doesn't _have_ a run loop though.

However, I'm glad to find out that this is false. I'll definitely call CFRunLoopRun().

thanks,

Philip Lukidis

--gc

-----Original Message-----
From: Garth Cummings [mailto:email@hidden]
Sent: Thursday, November 10, 2005 12:26 PM
To: Philip Lukidis
Cc: email@hidden
Subject: Re: pthreads and CF runloops (possibly slightly OT)

Hi Philip,

On Nov 10, 2005, at 9:07 AM, Philip Lukidis wrote:

However, I've read that a "POSIX thread does not

automatically associate itself with your application's run loop" (see link

below, sorry for the wrapping).

http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/ind

ex.html?http://developer.apple.com/documentation/Cocoa/Conceptual/Multithrea

ding/Multithreading.html

That link points to the top of that document. Were you thinking of <http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/articles/ThreadIntro.html>? That says:

Threads and run loops are tightly entwined entities. Many simple threads do not use the run loop and simply execute the code in their entry-point function. However, if you want your thread to remain running so that it can process requests at a future time, you need to start the thread’s run loop.

When I create a pthread, is a new run loop created, and is

the pthread associated with it?

Yes, to both questions. The confusion might be that the run loop isn't automatically _started_ when the thread runs. That can be done with CFRunLoopRun after attaching at least one run loop event source.

HTH,

--gc

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Garth Cummings

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