Date: Wed, 19 Dec 2012 02:03:32 -0800 From: Davide Italiano <davide@freebsd.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Ian Lepore <freebsd@damnhippie.dyndns.org>, Alexander Motin <mav@freebsd.org>, phk@onelab2.iet.unipi.it, freebsd-current <freebsd-current@freebsd.org>, "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Re: API explosion (Re: [RFC/RFT] calloutng) Message-ID: <CACYV=-Eg542iHm9KfujPvCzZrA4TqepEBVA8RzT1YOHnCgfJnA@mail.gmail.com> In-Reply-To: <14604.1355910848@critter.freebsd.dk> References: <50CF88B9.6040004@FreeBSD.org> <20121218173643.GA94266@onelab2.iet.unipi.it> <50D0B00D.8090002@FreeBSD.org> <50D0E42B.6030605@FreeBSD.org> <20121218225823.GA96962@onelab2.iet.unipi.it> <1355873265.1198.183.camel@revolution.hippie.lan> <14604.1355910848@critter.freebsd.dk>
index | next in thread | previous in thread | raw e-mail
On Wed, Dec 19, 2012 at 1:54 AM, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote: > -------- > In message <1355873265.1198.183.camel@revolution.hippie.lan>, Ian Lepore writes > : >>On Tue, 2012-12-18 at 23:58 +0100, Luigi Rizzo wrote: > >>I'm not so sure about the 2^k precision. You speak of seconds, but I >>would be worrying about sub-second precision in my work. > > It is a bad idea, and it is physically pointless, given the stabilities > of the timebases available for computers in general. > > Please just take my word as a time-nut, and use a 32.32 binary format > in seconds (see previous email) and be done with it. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > phk@FreeBSD.ORG | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. Right now -- the precision is specified in 'bintime', which is a binary number. It's not 32.32, it's 32.64 or 64.64 depending on the size of time_t in the specific platform. I do not really think it worth to create another structure for handling time (e.g. struct bintime32), as it will lead to code duplication for all the basic conversion/math operation. On the other hand, 32.32 may not be enough in the long future. What do you think about that? Thanks, Davidehome | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CACYV=-Eg542iHm9KfujPvCzZrA4TqepEBVA8RzT1YOHnCgfJnA>