Re: moving to processing from threading, global variables

[MRAB]

rkmr...@gmail.com wrote:

no one?

It's Easter! :-)

how can i share variables in processing?
please help out!

Threads run in the same address space, so they can share variables;
processes run in different address spaces, so they can't (normally).

You'll need to read the documentation carefully to see what the
recommended techniques are (and I doubt that sharing a global Boolean
variable is one of them...).

On Thu, Apr 9, 2009 at 8:05 AM, rkmr...@gmail.com <mailto:rkmr...@gmail.com> <rkmr...@gmail.com <mailto:rkmr...@gmail.com>> wrote:

    hi
    i am trying to move from threading to processing package. this is
    the controller i used to spawn new threads, and it used the global
    variable done to check if it needs to spawn more threads or not. it
    worked great for me. it checks if there is new data to be processed
    every
    30 seconds, and spawns of new threads to do the work, till all work
    is done.

but now in processing, anychange made to global variable done in

    sendalert method, is not reflected in the controller method.

can please point out what is wrong?

    thanks a lot!

code done = False

    def sendalert():
       global done
       users = q.get('xx')
       if not users:
         done = True
         return

done = False

       for u in users:
        do stuff

def control(number_threads_min=3, number_threads_max = 100):

        global done
        while True:
            number_threads = len(processing.activeChildren())
            if not done and number_threads<number_threads_max:
                processing.Process(target=sendalert).start()
            if done and number_threads<number_threads_min:
                processing.Process(target=sendalert).start()
                time.sleep(30)

if __name__ == '__main__':

        processing.Process(target=control).start()



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