MRAB,
Thanks for the hint! Yep, that's much easier!
Thanks! :)
Ron
On Thursday, June 6, 2013 5:49:55 PM UTC-7, MRAB wrote:
> On 07/06/2013 01:03, cerr wrote:
>
> > Hi,
>
> >
>
> > I have a process that I can trigger only at a certain time. Assume I have a
> > TDM period of 10min, that means, I can only fire my trigger at the 5th
> > minute of every 10min cycle i.e. at XX:05, XX:15, XX:25... For hat I came
> > up with following algorithm which oly leaves the waiting while loop if
> > minute % TDM/2 is 0 but not if minute % TDM is 0:
>
> > min = datetime.datetime.now().timetuple().tm_hour*60 +
> > datetime.datetime.now().timetuple().tm_min
>
> > while not (min%tdm_timeslot != 0 ^ min%(int(tdm_timeslot/2)) != 0):
>
> > time.sleep(10)
>
> > logger.debug("WAIT
> > "+str(datetime.datetime.now().timetuple().tm_hour*60 +
> > datetime.datetime.now().timetuple().tm_min))
>
> > logger.debug(str(min%(int(tdm_timeslot/2)))+" -
> > "+str(min%tdm_timeslot))
>
> > min = datetime.datetime.now().timetuple().tm_hour*60 +
> > datetime.datetime.now().timetuple().tm_min
>
> > logger.debug("RUN UPDATE CHECK...")
>
> >
>
> > But weird enough, the output I get is something like this:
>
> > I would expect my while to exit the loop as soon as the minute turns
> > 1435... why is it staying in? What am I doing wrong here?
>
> >
>
> > WAIT 1434
>
> > 3 - 3
>
> > WAIT 1434
>
> > 4 - 4
>
> > WAIT 1434
>
> > 4 - 4
>
> > WAIT 1434
>
> > 4 - 4
>
> > WAIT 1434
>
> > 4 - 4
>
> > WAIT 1434
>
> > 4 - 4
>
> > WAIT 1435
>
> > 4 - 4
>
> > WAIT 1435
>
> > 0 - 5
>
> > WAIT 1435
>
> > 0 - 5
>
> > WAIT 1435
>
> > 0 - 5
>
> > WAIT 1435
>
> > 0 - 5
>
> > WAIT 1435
>
> > 0 - 5
>
> > WAIT 1436
>
> > 0 - 5
>
> > RUN UPDATE CHECK...
>
> >
>
> Possibly it's due to operator precedence. The bitwise operators &, |
>
> and ^ have a higher precedence than comparisons such as !=.
>
>
>
> A better condition might be:
>
>
>
> min % tdm_timeslot != tdm_timeslot // 2
>
>
>
> or, better yet, work out how long before the next trigger time and then
>
> sleep until then.
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