Re: [python-imaging-sane] get_devices and threading
Fredrik Lundh <[email protected]>
| Newsgroups | gmane.comp.python.image |
|---|---|
| Message-ID | <[email protected]> |
Well, I'd say scanning falls under the "image stuff" umbrella, and the Sane bindings are shipped with the PIL source code... I don't know much about them, though, but I suspect this is a Python GIL issue. </F> 2010/12/28 Edward Cannon <[email protected]>: > wrong mailing list, this is for PIL and related topics only. Try a > sane specific mailing list > > On Mon, Dec 27, 2010 at 8:58 AM, Sandro Mani <[email protected]> wrote: >> Hi, >> I wanted to execute sane.get_devices in a separate thread, i.e. consider the >> following program: >> >> #!/usr/bin/env python >> # -*- coding: utf-8 -*- >> >> import threading >> import sane >> import time >> >> devices=None >> >> class GetDevicesThread(threading.Thread): >> def __init__(self): >> threading.Thread.__init__(self) >> self.setDaemon(True) >> >> def run(self): >> global devices >> #time.sleep(10) >> #devices=[] >> devices=sane.get_devices() >> >> sane.init() >> GetDevicesThread().start() >> print "Detecting devices" >> while devices==None: >> time.sleep(1) >> print "." >> print devices >> >> The devices=sane.get_devices() call in run() for some reason pauses the main >> thread during it's execution - if I switch the statement with the two >> commented lines above, all works as expected. Is there any particular reason >> for this behaviour? >> Thanks >> Sandro Mani >> _______________________________________________ >> Image-SIG maillist - [email protected] >> http://mail.python.org/mailman/listinfo/image-sig >> > _______________________________________________ > Image-SIG maillist - [email protected] > http://mail.python.org/mailman/listinfo/image-sig > _______________________________________________ Image-SIG maillist - [email protected] http://mail.python.org/mailman/listinfo/image-sig