[Gm2] Fwd: Re: value of maxSecondParts in SysClock.def

[john o goyo]

Meant to send this to the list.

Apologies,
john

-------- Original Message --------
Subject: Re:  value of maxSecondParts in SysClock.def
Date: Fri, 12 Feb 2016 16:12:47 -0500
From: john o goyo <address@hidden>
To: Gaius Mulley <address@hidden>

On 09/02/2016 05:38, Gaius Mulley wrote:
> "Riedl, Udo-Michael"<address@hidden>  writes:
>
> > Hallo,
> >
> > just noticed a small hurdle. In SysClock.def I find "CONST
> > maxSecondParts = 1000000;"
> > Value should be 100 on an Intel CPU based system, that's at least what
> > the following tells me
> >
> > #include<stdio.h>
> > #include<unistd.h>
> > void main()
> > {
> >        long int ClkTck;
> >        ClkTck = sysconf(_SC_CLK_TCK);
> >        printf("\n\n %s %12ld\n\n","CLK_TCK = ",ClkTck);
> > }
> >
> > The value is by sure OS / machine depended - maybe needs to be set different
> > on different platform a compile time.
> >
> > Cheers
> > Michael
>
> Hi Michael,
>
> interesting, I guess we cannot change the ISO definition module
> constant.  However inside SysClock.mod via wraptime.c it should deliver
> the fractional time in microseconds.  Is this not the case?  If not then
> this is a bug and could/will be fixed by scaling the clock tick
> appropriately.

Whence your value of maxSecondParts, Gaius?  ISO/IEC 10514-1:1996 Para.
9.6.1 specifies it as implementation-defined.

If this is mapped to the POSIX CLOCKS_PER_SEC, then the value is correct
(vide http://pubs.opengroup.org/onlinepubs/9699919799/ :"The value of
CLOCKS_PER_SEC shall be 1 million on XSI-conformant systems.").

Incidentally, Michael's value also comes out on my PPC- and Sparc-based
systems.

john

> regards,
> Gaius