def timeout_handler(nevents, maxevents):
'Recurring timeout, in loop.call_later it rescheduls itself'
if not cycle.running or (nevents and ievent[timer] >= maxevents):
loop.stop()
else:
handler(timer)
loop.call_later(cycle.period, timeout_handler, nevents, maxevents)
def run(nevents=0):
"""
Run the Piety event loop.
nevents: number of timer events to process, then exit run loop.
If nevents not 0, runs even if running==False
Use default nevents=0 to process until running==False or unhandled exception
"""
start()
maxevents = ievent[timer] + nevents # ievent includes previous calls to run()
interval = cycle.period # timeout interval in seconds
while cycle.running or (nevents and ievent[timer] < maxevents):
# Python select doesn't assign time remaining to timeout argument
# so we have to time it ourselves
t0 = datetime.datetime.now()
inputready, outputready, exceptready = select.select(inputs, outputs,
exceptions, interval)
# inputs
for fd in inputready:
handler(fd)
interval = adjust_interval(t0, interval)
# periodic timeout if no input
if not (inputready or outputready or exceptready):
handler(timer)
interval = cycle.period # if we got here, full interval has elapsed
def activate(t):
"""
Activate task t by registering t.input with loop and add to ievent counter.
Here we assume piety has already added task t to schedule.
"""
if t.input != timer:
loop.add_reader(t.input, (lambda: handler(t.input)))