[pygtk] Threads in PyGTK: keep typing while ping-ing

[Graham Whelan]

Hi Mamahita,

The problem is that you are calling Thread.join from within the main thread.
This causes the main thread to stop and wait until the PingHost threads have
completed, and so it's not updating the TextView. You should use a callback
to let PingHost return its results. Something like this:

import threading
import commands
import gtk
import gobject

gobject.threads_init()

class PingHost(threading.Thread):
    def __init__(self, host, callback):
        threading.Thread.__init__(self)
        self.host = host
        self.callback = callback

    def run(self):
        result = self.host, commands.getstatusoutput('ping %s -c1'
%(self.host))[0]
        self.callback(result)


class Main:
    def __init__(self):
        self.win = gtk.Window()
        self.win.connect('destroy', gtk.main_quit)
        #
        self.textb = gtk.TextBuffer()
        self.textv = gtk.TextView(self.textb)
        self.textv.set_size_request(500, 500)
        #
        self.win.add(self.textv)
        self.win.show_all()
        #
        gobject.timeout_add(5000, self.do_ping)

    def do_ping(self):
        for h in range(100, 120):
            host = '192.168.0.%d' %(h)
            #
            worker = PingHost(host, self.ping_result)
            worker.start()

            return True

    def ping_result(self, result):
        print result

if __name__ == '__main__':
  app = Main()
  gtk.main()


I hope this helps,

Graham.


2009/2/17 Mamahita Sela <mamahitasela at yahoo.com>

> Dear All,
>
> I have read several howtos for threading in PyGTK. I have tried some but
> with no luck.
>
> What i want is: i can keep typing in gtk.TextView while periodically doing
> ping some hosts.
>
> I think, the thread part is working since i can ping so fast (even for not
> reply host, around 3 s for 27 no-reply-host). But, when the ping action is
> running, i can not typing in textview. What i type while pinging will show
> up after ping action is done.
>
> (I am using 2.5.1, pygtk 2.10.6 on Linux x86)
>
> This is my code:
> import threading
> import commands
> import gtk
> import gobject
>
> gobject.threads_init()
>
>
> class PingHost(threading.Thread):
>   def __init__(self, host):
>       threading.Thread.__init__(self)
>       self.host = host
>       self.result = ()
>   def run(self):
>       self.result = self.host, commands.getstatusoutput('ping %s -c1'
> %(self.host))[0]
>
> class Main:
>   def __init__(self):
>       self.win = gtk.Window()
>       self.win.connect('destroy', gtk.main_quit)
>       #
>       self.textb = gtk.TextBuffer()
>       self.textv = gtk.TextView(self.textb)
>       self.textv.set_size_request(500, 500)
>       #
>       self.win.add(self.textv)
>       self.win.show_all()
>       #
>       gobject.timeout_add(5000, self.do_ping)
>
>   def do_ping(self):
>       all_threads = []
>       #
>       for h in range(100, 120):
>           host = '192.168.0.%d' %(h)
>           #
>           worker = PingHost(host)
>           worker.start()
>           all_threads.append(worker)
>       #
>       for t in all_threads:
>           t.join()
>           print t.result
>       #
>       return True
>
>
> if __name__ == '__main__':
>   app = Main()
>   gtk.main()
>
>
> PS 1: some friends told me about doing ping in other ways. But, beside
> ping, i also want to try another case. So, working on thread, imho, is
> important.
>
> PS 2: I also have tried to not join thread, replacing:
>       for t in all_threads:
>           t.join()
>           print t.result
>       #
> with:
>        for t in all_threads:
>            t.join(0.1)
>            if not t.isAlive():
>                print t.result
>
> But, then, all i can see is result from host that reply. And, using 0.1s
> timeout, my GUI is still freezing a little. Any idea?
>
>
> Any help would be appreciated :)
> Best regards,
> M
>
>
>
>
> _______________________________________________
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> http://www.daa.com.au/mailman/listinfo/pygtk
> Read the PyGTK FAQ: http://faq.pygtk.org/
>
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