Date: Wed, 19 Dec 2012 08:18:41 -0800 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Davide Italiano <davide@freebsd.org>, Ian Lepore <freebsd@damnhippie.dyndns.org>, Alexander Motin <mav@freebsd.org>, freebsd-current <freebsd-current@freebsd.org>, "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Re: API explosion (Re: [RFC/RFT] calloutng) Message-ID: <CA%2BhQ2%2Bgn64-b4Y4cvk_cTry55XZyc-vGesnLSkS2YcfmCTVd6Q@mail.gmail.com> In-Reply-To: <17057.1355931448@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> <CACYV=-Eg542iHm9KfujPvCzZrA4TqepEBVA8RzT1YOHnCgfJnA@mail.gmail.com> <15882.1355914308@critter.freebsd.dk> <20121219150809.GA98673@onelab2.iet.unipi.it> <17057.1355931448@critter.freebsd.dk>
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On Wed, Dec 19, 2012 at 7:37 AM, Poul-Henning Kamp <phk@phk.freebsd.dk>wrote: > -------- > In message <20121219150809.GA98673@onelab2.iet.unipi.it>, Luigi Rizzo > writes: > > >> typedef dur_t int64_t; /* signed for bug catching */ > >> #define DURSEC ((dur_t)1 << 32) > >> #define DURMIN (DURSEC * 60) > >> #define DURMSEC (DURSEC / 1000) > >> #define DURUSEC (DURSEC / 10000000) > >> #define DURNSEC (DURSEC / 10000000000) > > >only thing, we must be careful with the parentheses > > Actually, it's more impportant to be careful with zeros, if you > adjust the above to the correct number of zeros, DURNSEC is 4, > which is within seven percent of the correct value. > counting digits is impossible for people over 45. But i have a solution for that #define DURNSEC (DURSEC / 1003006009) which is within 0.5% of the desired value. (and of course (1000*1000*1000) might do the job too) cheers luigi
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