Re: [LAD] Python assistance - threads (my favorite)

On Thu, Oct 14, 2010 at 03:04:54PM -0700, Patrick Shirkey wrote:

> In a bit of a time crunch. Can anyone tell me how to do this properly?
>
> I would like to have a threaded timer to run "cmd" after 5 seconds.
> However cmd is normally triggered like this:
>
> os.system(cmd)
>
> But there seems to be an issue with calling os.system(cmd) from
> subprocess.popen.
>
> ==========================
>
> def do_popen(self, *args):
> subprocess.Popen(args[0], shell=True)
>
>
> def other function
>
> cmd = 'spd-say -t female2 "' + audioText + '"'
> args = shlex.split(cmd)
>
> # Add 5 second delay for first view to allow existing speech processes to
> finish
> print "do_speech: ",delay
> if delay:
> print "do_speech: delayed start"
> t = threading.Timer(5.0, self.do_popen(cmd))
> t.start()
> else :
> print "do_speech: immediate start"
> self.do_popen(cmd)
>
> ======================

A bit confusing - you mention os.system() but is not used at all
(nor should it if you use subprocess.Popen().

You didn't tell what happens...

I suspect that if you do this in a function the thread 't' will be
destroyed as soon as that function returns. Making 't' global could
help. (no guarantee -- speculating).

Ciao,

-- 
FA
There are three of them, and Alleline.
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