SingleRunner makes sure only one instance of programme running at the same time. the programme most likes: 1. it would run very long or run forever in a loop 2. and more running at the same time would make something terribly bad

so, use SingleRunner like this:

def my_main(a=1, b=3):
    import time
    while 1:
        print a+b
        a += 1
        b += 1

import siglerunner

sr = siglerunner.SingleRunner(__file__)
as_daemon = False
sr.run(as_daemon, my_main, 2,2)
#sr.run(as_daemon, my_main, a=3, b=3)