GNU bug report logs - #19581
'sleep' return value is incorrectly rounded

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Package: guile; Reported by: ludo@HIDDEN (Ludovic Courtès); dated Tue, 13 Jan 2015 12:59:02 UTC; Maintainer for guile is bug-guile@HIDDEN.

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From: Andy Wingo <wingo@HIDDEN>
To: Arne Babenhauserheide <arne_bab@HIDDEN>
Subject: Re: [PATCH] Allow giving floating point values to (sleep).
References: <8c8510a889e2d3b9f57f.1463767657@HIDDEN>
 <871t3j3a44.fsf@HIDDEN>
Date: Mon, 27 Jun 2016 10:10:13 +0200
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On Sun 26 Jun 2016 23:37, Arne Babenhauserheide <arne_bab@HIDDEN> writes:

> ping?

Let's follow up on bug #19581.

Thanks,

Andy
Information forwarded to bug-guile@HIDDEN:
bug#19581; Package guile. Full text available.

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From: ludo@HIDDEN (Ludovic =?utf-8?Q?Court=C3=A8s?=)
To: Andy Wingo <wingo@HIDDEN>
Subject: Re: bug#19581: 'sleep' return value is incorrectly rounded
References: <87a91mkfc3.fsf@HIDDEN> <87shw4p9ai.fsf@HIDDEN>
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Hello,

Andy Wingo <wingo@HIDDEN> skribis:

> On Tue 13 Jan 2015 13:58, ludo@HIDDEN (Ludovic Court=C3=A8s) writes:
>
>> I just noticed that =E2=80=98sleep=E2=80=99 essentially always rounds do=
wn its return
>> value, which makes it unreliable, as in this example:
>>
>> $ time guile -c '(sigaction SIGINT +) (call-with-new-thread (lambda () (=
let loop () (kill (getpid) SIGINT) (loop)))) (let loop ((n 3)) (when (> n 0=
) (loop (sleep (pk "s" n)))))'
>>
>> ;;; ("s" 3)
>>
>> ;;; ("s" 2)
>>
>> ;;; ("s" 1)
>>
>> real	0m0.039s
>> user	0m0.052s
>> sys	0m0.017s
>>
>> Here =E2=80=98loop=E2=80=99 is meant to assure we sleep for roughly 3 se=
conds, but
>> because of the incorrect rounding, we end up not sleeping at all.
>
> Hummmmmmmmmm.
>
> I don't think we can change anything in 2.0.  Right?
>
> In master, how about (1) we allow sleep to take any real number, in
> seconds; (2) sleep returns an inexact real number.  Then we can
> deprecate usleep and "standardize" on sleeping in units of seconds.
> Internally we refactor scm_std_usleep/* to take a 64-bit double for the
> number of seconds to sleep and return a double for the time remaining.

Sounds like a plan.  There could be programs that will break if =E2=80=98sl=
eep=E2=80=99
gives them an inexact instead of an integer.  Maybe we can assume this
is an unlikely situation, though.

Thoughts?

Ludo=E2=80=99.
Information forwarded to bug-guile@HIDDEN:
bug#19581; Package guile. Full text available.

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From: Andy Wingo <wingo@HIDDEN>
To: ludo@HIDDEN (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: bug#19581: 'sleep' return value is incorrectly rounded
References: <87a91mkfc3.fsf@HIDDEN>
Date: Thu, 23 Jun 2016 11:02:45 +0200
In-Reply-To: <87a91mkfc3.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
 =?utf-8?Q?s?= message of "Tue, 13 Jan 2015 13:58:04 +0100")
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Hi :)

On Tue 13 Jan 2015 13:58, ludo@HIDDEN (Ludovic Court=C3=A8s) writes:

> I just noticed that =E2=80=98sleep=E2=80=99 essentially always rounds dow=
n its return
> value, which makes it unreliable, as in this example:
>
> $ time guile -c '(sigaction SIGINT +) (call-with-new-thread (lambda () (l=
et loop () (kill (getpid) SIGINT) (loop)))) (let loop ((n 3)) (when (> n 0)=
 (loop (sleep (pk "s" n)))))'
>
> ;;; ("s" 3)
>
> ;;; ("s" 2)
>
> ;;; ("s" 1)
>
> real	0m0.039s
> user	0m0.052s
> sys	0m0.017s
>
> Here =E2=80=98loop=E2=80=99 is meant to assure we sleep for roughly 3 sec=
onds, but
> because of the incorrect rounding, we end up not sleeping at all.

Hummmmmmmmmm.

I don't think we can change anything in 2.0.  Right?

In master, how about (1) we allow sleep to take any real number, in
seconds; (2) sleep returns an inexact real number.  Then we can
deprecate usleep and "standardize" on sleeping in units of seconds.
Internally we refactor scm_std_usleep/* to take a 64-bit double for the
number of seconds to sleep and return a double for the time remaining.

WDYT?

Andy
Information forwarded to bug-guile@HIDDEN:
bug#19581; Package guile. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: ludo@HIDDEN (Ludovic =?utf-8?Q?Court=C3=A8s?=)
To: bug-guile@HIDDEN
Subject: 'sleep' return value is incorrectly rounded
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I just noticed that =E2=80=98sleep=E2=80=99 essentially always rounds down =
its return
value, which makes it unreliable, as in this example:

--8<---------------cut here---------------start------------->8---
$ time guile -c '(sigaction SIGINT +) (call-with-new-thread (lambda () (let=
 loop () (kill (getpid) SIGINT) (loop)))) (let loop ((n 3)) (when (> n 0) (=
loop (sleep (pk "s" n)))))'

;;; ("s" 3)

;;; ("s" 2)

;;; ("s" 1)

real	0m0.039s
user	0m0.052s
sys	0m0.017s
--8<---------------cut here---------------end--------------->8---

Here =E2=80=98loop=E2=80=99 is meant to assure we sleep for roughly 3 secon=
ds, but
because of the incorrect rounding, we end up not sleeping at all.

Ludo=E2=80=99.
Acknowledgement sent to ludo@HIDDEN (Ludovic Courtès):
New bug report received and forwarded. Copy sent to bug-guile@HIDDEN. Full text available.
Report forwarded to bug-guile@HIDDEN:
bug#19581; Package guile. Full text available.
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