queueing activations?

Hi,

I'm just getting started with SimPy and maybe am a bit confused about
how to queue events... I made this simple example:

<code>
from SimPy.Simulation import *

class AProcess(Process):
    def __init__(self):
        Process.__init__(self)
    def callback(self):
        while True:
            print "awake at", now()
            yield passivate, self

def main():
    initialize() # required

    a = AProcess()

    activate(a, a.callback(), at=10.0)
    reactivate(a, at=11)
    reactivate(a, at=12)

    simulate(until=100)

if __name__ == '__main__': main()
</code>

the output is:
awake at 12

I expected the output to be:
awake at 10
awake at 11
awake at 12

Is this sort of behavior possible (where activations are queued?) ?

Thanks,

------------------------------------------------------------------------------
Join us December 9, 2009 for the Red Hat Virtual Experience,
a free event focused on virtualization and cloud computing. 
Attend in-depth sessions from your desk. Your couch. Anywhere.
http://p.sf.net/sfu/redhat-sfdev2dev