Re: what is the best way to get microseconds of time on Windows in C or C++ ?

From	Lynn McGuire <lynnmcguire5@gmail.com>
Newsgroups	comp.lang.c, comp.lang.c++
Subject	Re: what is the best way to get microseconds of time on Windows in C or C++ ?
Date	2022-11-04 15:16 -0500
Organization	A noiseless patient Spider
Message-ID	<tk3rua$205ng$1@dont-email.me> (permalink)
References	<tk1p0t$1iv03$1@dont-email.me> <tk2fch$13ej$1@gioia.aioe.org> <tk3oto$1va6e$1@dont-email.me> <87pme233e6.fsf@bsb.me.uk>

Cross-posted to 2 groups.

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On 11/4/2022 2:50 PM, Ben Bacarisse wrote:
> Lynn McGuire <lynnmcguire5@gmail.com> writes:
> 
>> On 11/4/2022 2:35 AM, Juha Nieminen wrote:
>>> In comp.lang.c++ Lynn McGuire <lynnmcguire5@gmail.com> wrote:
>>>> What is the best way to get microseconds of time on Windows in C or C++
>>> It's a bit unclear whether you mean "time in microseconds units" or "time
>>> at the microseconds resolution".
>>> Because the latter may not be even possible (portable or not). Just because
>>> some time function returns time "in microseconds" that doesn't mean that it
>>> uses microsecond resolution (in other words, the value it returns may well
>>> change at longer intervals than every microsecond; probably *significantly*
>>> longer intervals).
>>> It is possible to get some kind of timing at the CPU clock cycle interval
>>> (in most modern CPUs, at least), which is about as accurate as you can
>>> possibly get, but I don't know if there are eg. some system functions that
>>> will return elapsed clock cycles converted into the equivalent amount of
>>> microseconds.
>>
>> Get time at the microseconds resolution.  My calculation engine
>> creates a bunch of temporary files and I use the time to create unique
>> names for those temporary files.  Seconds should be good enough for
>> uniqueness but I like adding microseconds as a guarantee.  Something
>> like
>>     uniquac1.out.009.20181972.20220912
> 
> Have you ruled out tmpnam and tmpfile?

I just ported this code from F77 to C++.  I totally forgot about tmpnam 
and tmpfile.

Thanks,
Lynn

Thread

what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-03 20:14 -0500
  Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 00:06 -0500
    Re: what is the best way to get microseconds of time on Windows in C or C++ ? Christian Gollwitzer <auriocus@gmx.de> - 2022-11-04 08:03 +0100
      Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 14:32 -0500
    Re: what is the best way to get microseconds of time on Windows in C or C++ ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-11-04 09:07 -0700
      Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 14:33 -0500
    Re: what is the best way to get microseconds of time on Windows in C or C++ ? Opus <ifonly@youknew.org> - 2022-11-06 20:53 +0100
      Re: what is the best way to get microseconds of time on Windows in C or C++ ? Michael S <already5chosen@yahoo.com> - 2022-11-06 14:30 -0800
        Re: what is the best way to get microseconds of time on Windows in C or C++ ? "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2022-11-07 07:48 +0100
          Re: what is the best way to get microseconds of time on Windows in C or C++ ? Michael S <already5chosen@yahoo.com> - 2022-11-07 04:11 -0800
            Re: what is the best way to get microseconds of time on Windows in C or C++ ? "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2022-11-08 18:30 +0100
              Re: what is the best way to get microseconds of time on Windows in C or C++ ? Michael S <already5chosen@yahoo.com> - 2022-11-08 15:37 -0800
                Re: what is the best way to get microseconds of time on Windows in C or C++ ? Öö Tiib <ootiib@hot.ee> - 2022-11-09 06:14 -0800
                Re: what is the best way to get microseconds of time on Windows in C or C++ ? Michael S <already5chosen@yahoo.com> - 2022-11-12 16:21 -0800
  Re: what is the best way to get microseconds of time on Windows in C or C++ ? Juha Nieminen <nospam@thanks.invalid> - 2022-11-04 07:35 +0000
    Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 14:24 -0500
      Re: what is the best way to get microseconds of time on Windows in C or C++ ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-11-04 19:50 +0000
        Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 15:16 -0500
      Re: what is the best way to get microseconds of time on Windows in C or C++ ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-11-04 15:05 -0700
        Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 17:35 -0500
          Re: what is the best way to get microseconds of time on Windows in C or C++ ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-11-04 15:56 -0700
          Re: what is the best way to get microseconds of time on Windows in C or C++ ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-11-04 16:15 -0700
          Re: what is the best way to get microseconds of time on Windows in C or C++ ? Michael S <already5chosen@yahoo.com> - 2022-11-06 14:41 -0800
            Re: what is the best way to get microseconds of time on Windows in C or C++ ? scott@slp53.sl.home (Scott Lurndal) - 2022-11-07 14:39 +0000
              Re: what is the best way to get microseconds of time on Windows in C or C++ ? Michael S <already5chosen@yahoo.com> - 2022-11-07 11:03 -0800
            Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-07 23:26 -0600
  Re: what is the best way to get microseconds of time on Windows in C or C++ ? Öö Tiib <ootiib@hot.ee> - 2022-11-04 01:23 -0700
    Re: what is the best way to get microseconds of time on Windows in C or C++ ? Juha Nieminen <nospam@thanks.invalid> - 2022-11-07 07:20 +0000
      Re: what is the best way to get microseconds of time on Windows in C or C++ ? Öö Tiib <ootiib@hot.ee> - 2022-11-07 07:11 -0800
  Re: what is the best way to get microseconds of time on Windows in C or C++ ? Michael S <already5chosen@yahoo.com> - 2022-11-04 03:12 -0700
    Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 14:35 -0500
  Re: what is the best way to get microseconds of time on Windows in C or C++ ? scott@slp53.sl.home (Scott Lurndal) - 2022-11-04 13:44 +0000
    Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 14:34 -0500
    Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-14 16:58 -0600
      Re: what is the best way to get microseconds of time on Windows in C or C++ ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-11-14 17:36 -0800
        Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-15 17:26 -0600
          Re: what is the best way to get microseconds of time on Windows in C or C++ ? Andreas <nospam@gmx.de> - 2022-11-16 13:15 +0100
  Re: what is the best way to get microseconds of time on Windows in C or C++ ? Bonita Montero <Bonita.Montero@gmail.com> - 2022-11-04 20:49 +0100
  Re: what is the best way to get microseconds of time on Windows in C or C++ ? Manu Raju <MR@invalid.invalid> - 2022-11-20 21:30 +0000

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