July 2009 - Darwin-dev - lists.apple.com

Re: Filling in a struct timespec with the current date?
by Jean-Daniel Dupas 29 Jul '09

29 Jul '09

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Re: Filling in a struct timespec with the current date?
by Esteban Bodigami 29 Jul '09

29 Jul '09

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Re: Filling in a struct timespec with the current date?
by Mo McRoberts 29 Jul '09

29 Jul '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Wed, Jul 29, 2009 at 08:54, Esteban Bodigami<esteban.bodigami(a)gmail.com> wrote: > Steve Checkoway <s(a)pahtak.org> >> >> On Jul 28, 2009, at 10:06 PM, Esteban Bodigami wrote: >> >>> 1 kilosec = 1 day >>> 1 kilosec != 1000 sec >> >> First, no. <http://en.wikipedia.org/wiki/Kilosecond> If you want a time in >> kiloseconds, divide the number of seconds by 1000. End of story. >> Second, I thought we were done with this sort of gibberish from you. >> Please, please stop. > > that's nanosecond... it is multiply not divide. kilo+ nano- Steve said: “ If you want a time in kiloseconds, divide the number of seconds by 1000.” e.g.: 1 second is 0.001 kiloseconds. 1000 seconds is 1 kilosecond. If you were to multiply, as you suggest: 1 second would be 1000 kiloseconds 1000 seconds would be 1000000 kiloseconds (which is clearly nonsense). > [snip irrelevance] M. -- http://nevali.net _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Filling in a struct timespec with the current date?
by Esteban Bodigami 29 Jul '09

29 Jul '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=e2w+Pea+7MzdpGFJxZSCqtkiCnFy+sUpMTNyHvHCDtw=; b=K7ENdn54jHkI3aYfrSFRXet3tTGhtAPNm3HEupnAw8TA2JH1xKOURi0P5qfXzqKxm4 v5eKplKmwH2DI7Y5hahSZA+JhX7q0dZwEp0oSGCI7F5vprBfUZtO98I51+GnqgFoLaXT UGIH8luwRc7Dc2DwEvJYVQZ0kQE65EmTWFX8o= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=hGptpcp6U4aCMo3uPvDt60B8+BXQP0Bw05izmMKghTK/IVI8vvD+navCSINOlLpiLV tU/50q3DA7kltbtTnFX+jO310tz+VuP74s1+P3oVQnmUJoKo+FjiF/ACBYGgJyIBv6/7 0bMkdEuE+Zvx64LnbGj+O3Pwe4DVQIqDSSAGw= _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Filling in a struct timespec with the current date?
by Eli Bach 29 Jul '09

29 Jul '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:from:to :in-reply-to:content-type:content-transfer-encoding:subject :mime-version:date:references:x-mailer; bh=o7LZmJiBc8wrordqa/hZAgERvAmit1Mvfim6BBi+NYE=; b=nBkUR7ow0WXXvRzZvmEn73xLV2ugBJHLX3wS3ECY6802wYpYKK7LA36kObJb/PqBUZ AM3V2aRRMYUQoUP3ybEgrAwcRtLmsHRFGNAAUzTXLgMbjyZiSV+GHyD+qEb6uVk0ep3o PxtILUYID0SDtgoGI0+kDEZaPoAREf9ToFWhQ= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:from:to:in-reply-to:content-type :content-transfer-encoding:subject:mime-version:date:references :x-mailer; b=O6Qn6XFLvh8aXiWUIkX8Uf35EwPs4+L9hCYwLLLxvpTMc8uUS7N+WNou6+j6upW1Qk NOzvsnkkRKfTyHPAOcbeRTCRtPrQSvDitr1MKgiZUMlWONeoRLb/TxkOrMq/juaLjqv+ ljFBkHar2/YlKiuTxLAU2/9QlUVJpna5NAMEA= On Jul 28, 2009, at 10:06 PM, Esteban Bodigami wrote: 1 kilosec = 1 day 1 kilosec != 1000 sec (1500), because of many astronomical cycles that were never taken into account when the 365 Gregorian Calendar was invented. the time zone is irrelevant, it is UTC +0 Esteban, Eli _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… ...which is weird... you may think that you just multiply the seconds to minutes and then to hours and finally to days... but NO! one day has never had 24 hours (1440)... it is like 24 hours + 1 minute for simplicity we have also the "megasec", which will be 1 year, and the "zetasec" which is 1 galactic year (the Mayan Calendar in this way is superior; they knew about the galactic year which equals 26,000 years). btw, for conversion of time i don't use "seconds" i use "units of time"... which are related to pixies (COLORS and LIGHT); because people cann't see either nano-pixies nor zeta-pixies (they are part of what has being proved by science to be outside of the range of human visible light)... one "light-second" is 300k -1m; but 1 unit of time = 3z units of lenght (almost meters). I am fine with the epoch being 1970, because if you -40 there is 1930 (Great Depresion) and if you +40 there is 2010 (next year, 2 years before the 13th baktun and the year 2555 of the Buddhist Era... there will be a year 2600 B.E. btw =) I have to say, your reply to my attempt to help you has put the final nail in the coffin. The units you describe don't show up in the first couple of pages of google results, and from the sound of them, seem to have been defined by you for your own personal needs. It is entirely unrealistic to assume anybody can help if you don't realize this. And from your earlier posts, you clearly are very enthusiastic about working with computers. However, you also come across as being very inexperienced with programming them. So the ideas and concepts you present either don't make sense or are considered very unrealistic by the people on this list, which by it's nature has a bunch of programmers/engineers that have a lot of experience in programming in general, and the design and programming of unix systems in particular. I would suggest that you need to spend a bunch of time reading the archives (past messages) for mailing lists to get a sense of what is appropriate to post and what kind of assistance the list can/will provide before you post again. However, I will no longer respond to your posts, as your ideas relating to computing, units and life are way beyond my ability to comprehend. This email sent to site_archiver(a)lists.apple.com

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Re: Filling in a struct timespec with the current date?
by Steve Checkoway 29 Jul '09

29 Jul '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jul 28, 2009, at 10:06 PM, Esteban Bodigami wrote: 1 kilosec = 1 day 1 kilosec != 1000 sec -- Steve Checkoway "Anyone who says that the solution is to educate the users hasn't ever met an actual user." -- Bruce Schneier _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com First, no. <http://en.wikipedia.org/wiki/Kilosecond> If you want a time in kiloseconds, divide the number of seconds by 1000. End of story. Second, I thought we were done with this sort of gibberish from you. Please, please stop. btw, for conversion of time i don't use "seconds" i use "units of time"... which are related to pixies (COLORS and LIGHT); because people cann't see either nano-pixies nor zeta-pixies (they are part of what has being proved by science to be outside of the range of human visible light)... one "light-second" is 300k -1m; but 1 unit of time = 3z units of lenght (almost meters). This just makes you look insane. Earlier, you said pixies were daemons. (That's not a question, nor a request for clarification.) I am fine with the epoch being 1970, because if you -40 there is 1930 (Great Depresion) and if you +40 there is 2010 (next year, 2 years before the 13th baktun and the year 2555 of the Buddhist Era... there will be a year 2600 B.E. btw =) I fail to see how this is relevant (which is true of everything you've written), but the 14th baktun begins December 21, 2012 <http://en.wikipedia.org/wiki/Baktun >. smime.p7s

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Re: Filling in a struct timespec with the current date?
by Esteban Bodigami 29 Jul '09

29 Jul '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=A3kamld5C1dUjUQW7yuMcfoaBb1C0Pe7Lt7ELTnfubU=; b=maOwEm/YbczthSjkjeuAFoPT+yDBD9w1jrHI9QnoFgFtcvZ2HsXG/V6LF86HQPddvm uur3bMuICt0TNxvb78x3yCS6bdB4Jyh3uou2ZL8KHV6YpU+He0aBWnxEKoPGWnR0l+C2 vQxGhyPKysCFXg3tkqrCfUjy+XPPzkqgsV7Fo= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=QMcrejOcdG6IKAFWqkj0kZ7FSWr/vDo1gmtbKjhK9TmYes/AX2H7KrG8eRMA4Ayuyf 74AwZ6kKO/O8TdVUtzU7oOlZ/Z3O/kQTwpiejfpkvfgJyFQqVQ6we9cHI9iVvFbW2+uI 8XQ+Vb5oyHRZv0yDzYMRmi/WMtNYJImG7w2go= _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Filling in a struct timespec with the current date?
by Eli Bach 29 Jul '09

29 Jul '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:from:to :in-reply-to:content-type:content-transfer-encoding:subject :mime-version:date:references:x-mailer; bh=DGuSUU19SnTJwa6QZZcxDGOPt33hLybdOG5ZGMK7eK8=; b=bl7qGlS+CfzsQfUUmD2VnWH4jN4G+HGtASuSGp77LNn7DGcflDvcTvrzofzXS7lDnW nGPYpwql2DrEh53ZoU2qirObUG6nmCSjYYdBT4NU9m4PHOeZv+ymIvBzXl2LpJVZCcV9 komm8oezEXRc5jsaY47uWjcFo5fpzrpriyvUY= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:from:to:in-reply-to:content-type :content-transfer-encoding:subject:mime-version:date:references :x-mailer; b=t8clJi69Z8SDMOiG4pA7ANRCw+EY1xMRvf8EMlI//qHbFwoI3jPbYuOXXchDIEnFGG 1uDJ79h/atN/GsRfuVHDBeZX3vP+H4h7BtJ3ovRgqdulOGvrGjlIJnKB4MvSt4IvDjMp 3cKhAww0bSj9LacoN+OGvTyRoFqKt0tCZVULg= On Jul 28, 2009, at 9:08 PM, Esteban Bodigami wrote: Well, first you need to define what you mean by 'time in kilosecs'. If you're ok with the time from Jan 1, 1970, you can use gettimeofday(). Once you have that, you just need to multiple that value by 1000. Eli _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… i want the time in kilosecs... If it's from some other date/time, you need to calculate the difference between Jan 1, 1970 and the date you want, perhaps taking the current time zone into account. There are a variety of functions available to do this kind of calculation. This email sent to site_archiver(a)lists.apple.com

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Re: Filling in a struct timespec with the current date?
by Esteban Bodigami 29 Jul '09

29 Jul '09

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RE: Filling in a struct timespec with the current date?
by Karan, Cem (Civ, ARL/CISD) 28 Jul '09

28 Jul '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: AcoPtHsvzHJigHWKSe25Tdk8NQGYPAAC4lLA Thread-topic: Filling in a struct timespec with the current date? Terry Lambert wrote on Tuesday, July 28, 2009 2:51 PM > On Jul 28, 2009, at 10:07 AM, Kevin Van Vechten <kvv(a)apple.com> wrote: > > On Jul 28, 2009, at 9:57 AM, Karan, Cem (Civ, ARL/CISD) wrote: > >> Jean-Daniel Dupas wrote on Tuesday, July 28, 2009 12:52 PM > >> > >>> Le 28 juil. 09 à 18:42, Karan, Cem (Civ, ARL/CISD) a écrit : > >>> > >>>> I'm trying to use struct timespec, and I want to initialize > >>> it to the > >>>> current date (sec & nanosec). Is there a function call > that I can > >>>> call that will do so, or do I have to roll my own? Note that I'm > >>>> looking for an API that will fill in a timespec that I > pass in, not > >>>> create a new one on the heap. > >>> > >>> > >>> You can wrap your own using gettimeofday() which does > what you want > >>> but using a timeval instead of a timespec. > >> > >> Yeah, that is what I'm doing now; I was hoping there was a cleaner > >> way, something along the lines of: > >> > >> ERROR_CODE initWithCurrentDate(&myTimeSpec); > >> > >> If there isn't, then such is life; I'll continue using what > >> gettimeofday(). > > > > Wrapping gettimeofday(3) is the way to go. There is a > POSIX REALTIME > > interface clock_gettime(3) that returns a struct timespec, > but Mac OS > > X does not implement these optional interfaces. > > Or if he needs better resolution, mach_absolute_time(), which > is well documented at <http://developer.apple.com>. > > Even if we did a clock_gettime(), you'd need to call > clock_getres() to get the resolution, and like > gettimeofday(), there's no guarantee that just because the > structure is capable of representing a resolution that that's > the resolution you'd get. I could give you the interface > tomorrow, but depending on the resolution I picked, it could > be worse than gettimeofday() while still being technically > standards compliant. > Without the rest of the [TMR] functionality, though, the > feature test macro from <unistd.h> that would let you use the > interface safely in the knowledge it was compliant would > still claim it wasn't there. > > The only guaranteed resolution is going to be if you call > mach_absolute_time() and then do the numerator/denominator > math via the contents of the mach_timebase_info structure > (i.e. you can not assume it is in nanoseconds or that the > value is 1/1, particularly for hardware clocked at less than > 1GHz, for example, an iPhone). > > In general, timespec is mostly useful as a parameter to > things like pselect to contain delta times, rather than > useful for times since the epoch, and for measuring time, for > example for benchmarking a new version of your code against > the previous version of your code to check for regressions, > you probably want better resolution than you'll get from > gettimeofday(). Wow! Thank you Terry, I'll recode my code to use that immediately; it's a lot more accurate than what I need at the moment, but having accurate clock code that I can reuse is always useful! Thanks, Cem Karan _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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