multithreading on Linux

[Steve Holden]

Duncan Grisby wrote:
> 
> In article <slrn8r6r97.3gj.bbp at zen.via.ecp.fr>,
>  Brieuc Jeunhomme <bbp at via.ecp.fr> wrote:
> 
> >However, I have recently written a multithreaded app, and I can't
> >understand why I always get weird
> >'currentThread(): no current thread for 1026' when a thread terminates.
> >Probably I have missed something.
> 
> This happens when you mix threads created with the thread module (or a
> C extension) with constructs in the threading module. You should use
> the threading module to create threads if you intend to use threading
> for anything else.
> 
> Cheers,
> 
> Duncan.
> 
> --
>  -- Duncan Grisby  \  Research Engineer  --
>   -- AT&T Laboratories Cambridge          --
>    -- http://www.uk.research.att.com/~dpg1 --
Here's a threading sample by Jeff Blaine which I stashed away some time
ago as potentially useful:

Ripped straight from Aahz Maruch's post the other day and simplified
as more of a 'visual learning tool' demo.  Added a few comments...
whatever...just posting in case someone finds this one more graspable
at a thread-beginner level like me.

#!/usr/local/bin/python

import time, threading, whrandom

class MyThread(threading.Thread):
    """ Each thread picks a 'random' integer between 0 and 19 and reports
        in once per second for that many seconds.
    """

    def run(self):
        iterations = whrandom.randint(0, 19)
        for i in range(iterations):
            print "   ", self.getName(), "is reporting in"
            time.sleep(1)
        print self.getName(), "is DONE"


if __name__ == '__main__':
    threadList = []

    # Create 5 MyThread() threads
    for i in range(5) :
        thread = MyThread()
        threadList.append(thread)

    # Start all threads
    for thread in threadList:
        thread.start()

    # As long as we have more than just the 'main' thread running, print out
    # a status message
    while threading.activeCount() > 1 :
        print str(threading.activeCount()), "threads running including main"
        time.sleep(1)

Hope this helps.

regards
 Steve
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