LoopingCall Counters

from twisted.internet.task import LoopingCall
from twisted.internet import reactor

counters = [3, 3, 3, 3]

def make_fun(index):
    def decrement():
        global counters
        counters[index] -= 1
        print "LoopCall # {} down to {}".format(index, counters[index])
        if not counters[index]:
            counters[3] -= 1
            print "LoopCall # ", index, " died!"
            if not counters[3]:
                print "Stopping reactor..."
                global reactor
                reactor.stop()
            lcs[index].stop()
    return decrement

lcs = [LoopingCall(make_fun(i)) for i in range(3)]
for i, lc in enumerate(lcs):
    lc.start(i)

reactor.run()
print "Stop!"