Tim> It's not so fine that this delicate code is duplicated, so I'd
Tim> rather see an internal refactoring to use a common backoff-polling
Tim> class.
I recently copied it to my own code as well. I'd like to see it whacked
into something reusable. This seems to work:
import time
class Timeout(Exception): pass
def await_condition(predicate, timeout):
delay = 0.0005
endtime = time.time() + timeout
while True:
if predicate():
return
remaining = endtime - time.time()
if remaining <= 0: # time's up, predicate always failed
raise Timeout
delay = min(delay * 2, remaining, .05)
time.sleep(delay) # reduce CPU usage by using a sleep
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