On Mar 20, 4:36 am, akineko <akin...@gmail.com> wrote: > Hello everyone, > > I have started using multiprocessing module, which is now available > with Python 2.6. > It definitely opens up new possibilities. > > Now, I developed a small GUI package, which is to be used from other > programs. > It uses multiprocessing and Pipes are used to pump image data/command > to the GUI process. > (I used multiprocessing because I got stack size problem if I used > threading) > > It works great under Solaris environment, which is my primary > development environment. > > When I tried the program under Linux (CentOS5), the program didn't > work (it hung). > My other programs that use multiprocessing work flawlessly under both > Solaris and Linux. > > To investigate this problem, I create a much simpler test program. The > test program uses only basic necessary codes, nothing else. But my > simple test program still exhibits the same problem. > > My test program display a GUI Button using three possible approaches: > > (1) multiprocessing (Solaris - okay, Linux - hung) > (2) threading (Solaris - okay, Linux - okay) > (3) none (main thread) (Solaris - okay, Linux - okay) > > Is this a bug in a multiprocessing package? Or, I overlooked > something? > > Any comments on resolving this problem will be greatly appreciated. > > The attached is my test program (sorry for posting a long program). > > Thank you! > Aki Niimura > > #!/usr/bin/env python > > import sys, os > import time > import threading > import multiprocessing > > from Tkinter import * > > ### > ### class Panel > ### > > class Panel: > > def __init__(self, subp='multip'): > if subp == 'multip': > print 'multiprocessing module to handle' > # GUI process > self.process1 = multiprocessing.Process(target=self.draw) > self.process1.start() > elif subp == 'thread': > print 'threading module to handle' > # GUI thread > self.thread1 = threading.Thread(target=self.draw) > self.thread1.start() > # self.thread1.setDaemon(1) > else: > print 'main thread to handle' > pass > > def draw(self): > self.root = Tk() > w = Button(self.root, text='Exit', command=self.root.quit) > w.pack() > self.root.mainloop() > > ### > ### Main routine > ### > > def main(): > subp = 'multip' > if len(sys.argv) >= 2: > if not sys.argv[1] in ['multip', 'thread', 'none',]: > print 'Invalid option: %s' % sys.argv[1] > print "Valid options are 'multip', 'thread', 'none'" > sys.exit(1) > else: > subp = sys.argv[1] > panel = Panel(subp) > if subp == 'none': > panel.draw() > while 1: > time.sleep(1) > pass > > if __name__ == '__main__': > main()
It is just a guess, but did you try making 'draw' a function and not a method? I read that parameters to the subprocess function shall be pickable; in your test program, 'draw' as 'self' as parameter, which is a Tkinter.Panel, and I read somewhere that Tkinter objects are not pickable ... Ciao ---- FB -- http://mail.python.org/mailman/listinfo/python-list
