site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Hi Shawn, thanks for your reply. I'll answer inline. Philip Lukidis

-----Original Message----- From: Shawn Erickson [mailto:shawn@freetimesw.com] Sent: Thursday, November 10, 2005 12:35 PM To: Philip Lukidis Cc: darwin-dev@lists.apple.com Subject: Re: pthreads and CF runloops (possibly slightly OT)

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

...

Is this true?

To be honest I am not sure I understand that statement in the developer documentation... It may make sense to file a doc defect to get that statement better clarified, it is a little lose in terminology (I assume "your application's run loop" means your applications main thread's runloop).

...

When I create a pthread, is a new run loop created, and is the pthread associated with it?

Likely no because I believe they are created lazily but that is an implementation detail (one that I am guessing at myself).

Lazy creation is OK, as long as it is created when I ask for it via CFRunLoopGetCurrent() (and it seems to be).

...

I ask this because I've done a simple (naive) test of outputting the address of my main runloop, and then outputting the address of a pthread runloop, and they are different.

They should be different since they are different threads. Each thread can get its own runloop which is basically a thread local data structure.

Yes, I was hoping for them to be different. My initial understanding was that no runloop would ever be created for pthreads, but thankfully this is quite false.

...

I've also modified my simple daemon to receive client messages in the created pthread, which seems to work.

Can you better explain how you did this so we can help make sure we (and you) understand things? I ask given the following question.

Well, instead of waiting for messages from main(), I did so from my pthread, using CFRunLoopGetCurrent() in order to get the runloop. This worked OK, and is what I was hoping for.

...

So the question is, are pthreads associated with a runloop, and, if not, how can I create a runloop and associate a pthread with it?

In this case when running under your pthread simply use CFRunLoopGetCurrent() but if in Cocoa/Carbon use their API for runloops. Of course that only gets you a valid reference for the runloop associated with the current thread (possibly "creating" it if needed). To actually have the runloop do what it does you need to run it.

Yes, this is what my simple server app showed me.

<http://developer.apple.com/documentation/CoreFoundation/Conceptual/ CFRunLoops/Tasks/Running.html>

-Shawn

Thanks for that link, I'll read up more about runloops. Philip Lukidis _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... This email sent to site_archiver@lists.apple.com