New to threads. How do they work?

[Dermot Doran]

Hi

I think the answer to your last question is that the threading module
provides a high level interface (i.e. easier to  use) to the thread module.
The thread module is very low-level.  Any threaded python scripts I have
written (not expert) have used the threading module which is, in my opinion,
a very clean easy to use module.  Just takes a bit of hacking with to get
used to.

Cheers!!

Dermot.


On 19 Jul 2006 23:53:22 -0700, gel <geli at tasmail.com> wrote:
>
>
> Dennis Lee Bieber wrote:
>
> > On 19 Jul 2006 19:08:12 -0700, "gel" <geli at tasmail.com> declaimed the
> > following in comp.lang.python:
> >
> > > import thread
> > >
> >       Step one... Skip the thread module and use threading module
> instead.
> >
> > > def create():
> > >
> > >         pythoncom.CoInitialize()
> > >         c = wmi.WMI()
> > >         while 1 :
> > >
> > >             print "watching creation"
> > >             watcher = c.watch_for(notification_type="Creation",
> > > wmi_class="Win32_Process", delay_secs=1)
> >
> >       I don't know WMI, but is that delay a real sleep operation, or a
> > polling loop?
> >
> >       And either could be a problem if they hold the GIL -- preventing
> > anything else from running until they return...
> >
> > >
> > > thread.start_new_thread(create(),())
> > > thread.start_new_thread(delete(),())
> >
> >       At the very least, I suggest commenting out the COM and WMI calls
> --
> > test threads that ONLY print output and do a time.sleep(1). That should
> > be sufficient to see if the threads themselves are being started.
> > --
> >       Wulfraed        Dennis Lee Bieber               KD6MOG
> >       wlfraed at ix.netcom.com           wulfraed at bestiaria.com
> >               HTTP://wlfraed.home.netcom.com/
> >       (Bestiaria Support Staff:               web-asst at bestiaria.com)
> >               HTTP://www.bestiaria.com/
>
> Thanks alot for your help.  I had tried using threading with a
> different setup in the function side but did not get success. I think
> that I have winner now.  Thanks again.  What follows is the what I have
> working so far.  And another question why do you prefer to us threading
> and thread?
>
> import wmi
> import pythoncom
> import threading
>
> def create():
>
>        pythoncom.CoInitialize()
>        c = wmi.WMI()
>        while 1 :
>
>            print "watching creation"
>            watcher = c.watch_for(notification_type="Creation",
> wmi_class="Win32_Process", delay_secs=1)
>            print watcher()
>
> def delete():
>
>        pythoncom.CoInitialize()
>        d = wmi.WMI()
>        while 1 :
>            print "watching deletion"
>            watcher = d.watch_for(notification_type="Deletion",
> wmi_class="Win32_Process", delay_secs=1)
>            print watcher()
>
> import threading
> threading.Thread(target=create).start()
> threading.Thread(target=delete).start()
>
> Cheers
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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