Re: [Pyobjc-dev] Web Services Tool example broken

[Ronald O. <ous...@ci...>]

On 6-apr-04, at 16:21, Bob Ippolito wrote:

>
> On Apr 6, 2004, at 3:01 AM, Just van Rossum wrote:
>
>> Bob Ippolito wrote:
>>
>>> I have no idea how to reasonably debug that example, it freely mixes
>>> ObjC and Python threading code.  It's not even correct for at least
>>> one reason: it doesn't detach an NSThread anywhere, so Foundation and
>>> Cocoa are not notified to be thread safeish.  Even though it did work
>>> previously, that might have been by accident.
>>
>> Huh? The WST example goes through great pain not to call any GUI code
>> from the worker threads, so I don't see why Cocoa needs to be 
>> notified.
>>
>> It's also the first time I hear that pure pthreads would be a no-no in
>> Cocoa. Is that really so? How do NSThreads cooperate with the 
>> threading
>> module?
>
> The thing is that Foundation and Cocoa needs to know about the threads 
> you are using in the same way that Python needs to know about them 
> (via PyGILState_Ensure, etc.).  There is a hook and notification that 
> happens in Foundation when you detach your first NSThread (which this 
> program never explicitly does), and you are otherwise supposed to at 
> least call +[NSThread currentThread] from any raw pthread that expects 
> to call Foundation or Cocoa code (which this program also never does).
>
> That said, it's probably not WHY it doesn't work, I'm just saying the 
> program isn't strictly correct to begin with, and it uses threads, so 
> it will be hard to debug.

It worked before the PyGILState_ changes, and doesn't work now. I'd say 
this is a PyObjC bug until proven otherwise.

Luckily I've already fixed this problem: the wrapper for 
NSApplicationMain didn't release the GIL.

Ronald
>
> -bob
>
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by: IBM Linux Tutorials
> Free Linux tutorial presented by Daniel Robbins, President and CEO of
> GenToo technologies. Learn everything from fundamentals to system
> administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click
> _______________________________________________
> Pyobjc-dev mailing list
> Pyo...@li...
> https://lists.sourceforge.net/lists/listinfo/pyobjc-dev
>
>
--
X|support bv            http://www.xsupport.nl/
T:  +31 610271479       F:  +31 204416173