[Haskell-cafe] threadDelay delays less time than expected (Windows)

[Theodore Lief Gannon]

The existence of a workaround doesn't make it not a bug! Definitely report
it anyway. Worst case, the bug is actually in Windows but is now known and
centrally documented. For that matter, GCH could build the replicateM trick
into the implementation on a platform-specific basis.

On Dec 29, 2016 5:21 AM, "Lian Hung Hon" <hon.lianhung at gmail.com> wrote:

> Dear Tom,
>
> That is a good workaround, now I'm using divMod with the max value of Int,
> and things are working again :) So it really is because of int overflow
> somewhere..
>
> Since a workaround is available I guess I won't file a bug report yet.
> Thomas' comment also got me second guessing myself..
>
> Thank you everyone for your help and guidance!
>
> Regards,
> Hon
>
> On 29 Dec 2016 09:47, <amindfv at gmail.com> wrote:
>
>> If their supplied code sample is failing, couldn't that indicate a bug in
>> the Windows threadDelay implementation for very large values?
>>
>> Hon: if you're looking for a short-term solution you can always:
>>
>> replicateM 48 $ threadDelay $
>>    (half an hour)
>>
>> This way you only have to wait half an hour to be sure there's no
>> overflow or incorrect timing.
>>
>> Tom
>>
>>
>> > El 28 dic 2016, a las 18:47, Thomas DuBuisson <
>> thomas.dubuisson at gmail.com> escribió:
>> >
>> > Not to be infuriating, but I think you should check and re-check your
>> > tooling is not using 32 bit values at any particular point.
>> >
>> > Notice:
>> >
>> > (fromIntegral (86400000000 `mod` 2^32)) / 10^6 ~ 500 seconds which is
>> > your observation.  Any time you depend on `Int` to represent numbers
>> > near or greater than 2^28, or perhaps 2^31 in practice, you should
>> > think hard about bounds and implications regarding portability anyway.
>> >
>> > -Thomas
>> >
>> >> On Wed, Dec 28, 2016 at 4:05 PM, Lian Hung Hon <hon.lianhung at gmail.com>
>> wrote:
>> >> Dear Tom/Yitz,
>> >>
>> >> Just tested, returns False. I'm on 64 bit by the way. What should I do
>> from
>> >> here?
>> >>
>> >> Regards,
>> >> Hon
>> >>
>> >>
>> >>> On 29 Dec 2016 03:47, "Yitzchak Gale" <gale at sefer.org> wrote:
>> >>>
>> >>> Tom wrote:
>> >>>> (86400000000 :: Integer) > (fromIntegral (maxBound :: Int))
>> >>>>
>> >>>> If True, your machine (32-bit?) is probably overflowing the Int
>> >>>
>> >>> Good point. Even if False on Lian's Windows machine, it could
>> >>> be there is some 32-bit value somewhere in the Windows
>> >>> implementation that causes this.
>> >>>
>> >>> Yitz
>> >>
>> >>
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