Trouble with Multi-threading

[Steven D'Aprano]

On Tue, 10 Dec 2013 11:21:32 -0500, dan.rose wrote:

> I am running PYTHON 2.7.3 and executing a PYTHON program that uses
> multi-threading.  I am running this on a 64-bit Windows 2008 R2 server
> (Service Pack 1).

Hi Dan, and despite the emails from a few others, welcome. My further 
comments below, interleaved with your questions.


> Three months ago, I was able to execute this program just fine.  I ran
> the program and opened Task Manager and verified that the program
> successfully obtained all of the multiple threads it requested.

Sounds great, but unfortunately you don't actually show us the program, 
so there's very little we can say about it.

If possible, please show us the actual program. If not, please try to 
show us a simplified version which still displays the fault. If you can't 
do that, at least tell us what result you expect, and what result you 
actually get.

Are you sure you're talking about multi-threading? Do you perhaps mean 
multi-processing? I'm not a Windows user, but I would expect that only 
independent processes show up in Task Manager, not threads within a 
single process.


> Now, when I go to run this same program (no changes to the program), I
> am getting this message:

If nothing has changed with the program, it's unlikely that the behaviour 
will have changed. Since the behaviour has changed, something must be 
different. If not in the program itself, perhaps something in it's 
environment.


> Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit
> (AMD64)] on win32
> Type "copyright", "credits" or "license()" for more information.
>>>> ================================ RESTART
> ================================
>>>> 
> <multiprocessing.queues.Queue object at 0x00000000042309E8>

How are you running the program? If you are using IDLE, the first step 
when you run into problems is to *not* use IDLE. Instead of running the 
program through the interactive IDLE environment, I recommend you try 
running it directly in Python via the command line and see if the error 
persists. Do you know how to do this or do you need help?

Lastly, Dan, if you don't mind I'd like to make a couple of requests. 
This forum is both an email mailing list and a text-only Usenet news 
group, were so-called "Rich Text" (actually HTML) emails are frowned 
upon. If you don't mind, please disable "Rich Text" when sending messages 
to this group, as many people get annoyed having to deal with posts like 
yours that include content like:

<br><font size=2 face="sans-serif">

Also, if there's any way to drop the legal disclaimer when sending here, 
that too would be appreciated.

Thanks for your cooperation, and feel free to ask any further questions, 
hopefully you'll get a few more useful responses next time.


Regards,



-- 
Steven