Re: [9fans] Re: APE:sys/time.h: long instead of suseconds_t

[tlaronde@polynum.com]

Le Thu, Oct 14, 2021 at 06:11:54PM +0000, Conor Williams a écrit :
> surely you can shift a 64 bit long?
> 

In fact, I have read cursorily the man page and misread "the time is
expressed in seconds and microseconds since EPOCH" to mean "expressed
in seconds AND expressed in microseconds" while there is a structure
because there is the integer (seconds) part and the fractional
(microseconds) part. Hum...

So, yes, the result (in microseconds) can be hold in a long long.

And for long instead of suseconds_t, I'm probably the only one who will
ever directly use suseconds_t in the code for a variable thinking it is
like the result of nsec(2) and it is probably a type that will never
appear in real user code.

So let this RIP.

> On Thu, Oct 14, 2021 at 6:04 PM <tlaronde@polynum.com> wrote:
> 
> > Le Thu, Oct 14, 2021 at 07:56:37PM +0200, tlaronde a écrit :
> > > As suggested by ori@eigenstate.org, I have used gettimeofday(2) to
> > > achieve what I needed.
> > >
> > > But I had to change suseconds_t (in POSIX) to long (in Plan9
> > > ape/include/sys/time.h).
> > >
> > > But are all the compilers in Plan9 making long an octabytes, whatever
> > > the arch and the machine? Because a long, if it is a tetra, will never
> > > hold the value...
> >
> > I misread: the microseconds are for the fractional part. I was still
> > focusing on nsec() and taking the one for the other.
> >
> > But the following still holds:
> >
> > >
> > > Furthermore, for portability, there should be a typedef associating
> > > suseconds_t to long (or vlong, if long is not guaranteed to be an
> > > octa).
> > >
> > --
> > Thierry Laronde <tlaronde +AT+ polynum +dot+ com>
> >              http://www.kergis.com/
> >             http://kertex.kergis.com/
> >                http://www.sbfa.fr/
> > Key fingerprint = 0FF7 E906 FBAF FE95 FD89  250D 52B1 AE95 6006 F40C

-- 
        Thierry Laronde <tlaronde +AT+ polynum +dot+ com>
                     http://www.kergis.com/
                    http://kertex.kergis.com/
                       http://www.sbfa.fr/
Key fingerprint = 0FF7 E906 FBAF FE95 FD89  250D 52B1 AE95 6006 F40C

------------------------------------------
9fans: 9fans
Permalink: https://9fans.topicbox.com/groups/9fans/T232b7176352c012b-M86b19184ee7cf17b00f55809
Delivery options: https://9fans.topicbox.com/groups/9fans/subscription