[KIU Shueng Chuan]
>Hi, I was trying threads for the first time and not getting it to work, I
>browsed the list archives and found the below piece of code. It
>didn't work either and displayed the same symptoms as my
>program, ie my thread didn't seem to be getting any timeslice at
>all, but once I quit the mainloop(), the thread would jump to life.
it cannot work: the code is blocking the thread by calling threads_enter()
and threads_leave() around mainloop() which locks the mutex that the
thread is waiting for by calling threads_enter() itself, so it can only
run after mainloop() has returned and threads_leave() has been called (at
the end of the code).
>Finally, I added an idlefunc which I commented out below, and
>suddenly everything worked, both my program and one below.
this probably means that gdk is unlocking the mutex
before/after/around calling an idle function.
read the gdk/gtk docs about when to lock/unlock the gdk mutex; the
multithreading precautions should apply to a python program the same way
they apply to a C program.
>I am using win98, is this normal?
sadly, yes ;)
and to answer your question the way you probably rather meant it:
on unix, the code behaves the way you describe, too.
>from gtk import *
>from threading import *
>import time
>
>class Worker(Thread):
> def __init__ (self, widget):
> Thread.__init__(self)
> self.counter = 0
> self.widget = widget
>
> def run (self):
> while 1:
> threads_enter()
here it tries locking the mutex which is held by (see below)
> self.widget.set_text ("Count: %d" % self.counter)
> threads_leave()
> time.sleep(1)
> self.counter = self.counter + 1
>
># def idlefunc():
># time.sleep(0.1)
># return TRUE
>
># idle_add(idlefunc)
>
>win = GtkWindow()
>label = GtkLabel()
>win.add(label)
>win.show_all()
>
>threads_enter()
this locks the mutex.
>worker = Worker(label)
>worker.start()
>mainloop()
>threads_leave()
this unlocks it, so the thread can lock it (and finally do its work)
.tim
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