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Re: [sc-dev] Timers




On 30 Dec 2012, at 08:01, Scott Wilson <s.d.wilson@xxxxxxxxxx> wrote:

> 
> 
> On 30 Dec 2012, at 03:58, Jonatan Liljedahl <lijon@xxxxxxxxxxxx> wrote:
> 
>> There's also the case of stopping a periodic timer, then it's not only
>> enough to disable the evaluation of a function.
> 
> I'm not sure I understand. You'd just do periodic timers in the traditional fashion, by returning a rescheduling value. That's perhaps not the most intuitive method, but it's very flexible, and users must learn about it anyway, as it can trip them up otherwise.

Oh I see, you want to be able to cancel just one item of a repeating timer? I wonder is that really common enough a need to require a class in Common?

But I'm not especially bothered either way.

S.

> 
> S.
>> 
>> Surely one can combine stuff to get a cancelable timer, but that would
>> never be as straight forward as a dedicated timer class.
>> 
>> Another solution would be to add the ability to unschedule an item
>> previously scheduled on a clock. I think it would work by popping all
>> items from the prioQ, and discard the one to be removed, and push the
>> rest back again. This might be a good thing to have anyway, even if we
>> add a dedicated simple timer class.
>> 
>> 
>> On Sun, Dec 30, 2012 at 4:58 AM, Scott Wilson <s.d.wilson@xxxxxxxxxx> wrote:
>>> Perhaps something more general would be useful, i.e. a wrapper which evaluates only conditionally would give the cancel-ability and also be useful for other purposes.
>>> 
>>> Fdef could be used for this already I suppose.
>>> 
>>> S.
>>> 
>>> On 29 Dec 2012, at 15:11, Jonatan Liljedahl wrote:
>>> 
>>>> SkipJack has a few differences:
>>>> - the name of the class has nothing to do with "timer"
>>>> - survives cmdPeriod (as you said)
>>>> - most importantly, it always repeats, no one-shot timers
>>>> 
>>>> Also it's rather complex compared to a simple lightweight timer, due
>>>> to the cmdperiod-survival and storing skipjacks by name, etc. I think
>>>> SkipJack has a clear and useful purpose (periodic timer that survives
>>>> cmdPeriod), and that it would be nice with a separate simple and clear
>>>> timer class similar or equal to the one I posted, instead of extending
>>>> SkipJack.
>>>> 
>>>> On Sat, Dec 29, 2012 at 9:31 PM, Jakob Leben <jakob.leben@xxxxxxxxx> wrote:
>>>>> On Sat, Dec 29, 2012 at 4:54 PM, Jonatan Liljedahl <lijon@xxxxxxxxxxxx> wrote:
>>>>>> sclang does not have Timers, in the usual sense of timers in other
>>>>>> languages, like NSTimer in obj-c.
>>>>>> 
>>>>>> There is someClock.sched, but those are not cancelable.
>>>>> 
>>>>> Well, there is SkipJack. It survives CmdPeriod, but could easily be
>>>>> extended to not...
>>>>> 
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>>>> 
>>>> 
>>>> --
>>>> /Jonatan
>>>> http://kymatica.com
>>>> 
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>> 
>> 
>> -- 
>> /Jonatan
>> http://kymatica.com
>> 
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