From owner-freebsd-stable@freebsd.org  Thu Jul 23 13:51:52 2015
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Date: Thu, 23 Jul 2015 09:51:50 -0400
Message-ID: <CAKFCL4Up=cW0mue-XXhnw+u6KfTTSv8T4xzMr4+2p=Y4CoJ=rQ@mail.gmail.com>
Subject: Re: struct timehands: th_generation field
From: Brandon Allbery <allbery.b@gmail.com>
To: deco33000@yandex.com
Cc: freebsd-stable <freebsd-stable@freebsd.org>
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On Thu, Jul 23, 2015 at 9:43 AM, <deco33000@yandex.com> wrote:

> I am struggling on one field of a struct :
> http://fxr.watson.org/fxr/source/kern/kern_tc.c?v=FREEBSD10#L63
> I would like to understand what th_generation means please.
>

Seems to me you get a clue from: (
http://fxr.watson.org/fxr/source/kern/kern_tc.c?v=FREEBSD10#L192)

*/*** * Functions for reading the time.  We have to loop until we are
sure that** * the timehands that we operated on was not updated under
our feet.  See** * the comment in <sys/time.h> for a description of
these 12 functions.** */*
>
> #ifdef FFCLOCK
> voidfbclock_binuptime <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=fbclock_binuptime>(struct bintime <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=bintime> *bt <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=bt>)
> {
>         struct timehands <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=timehands> *th;
>         unsigned int gen <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=gen>;
>
>         do {
>                 th = timehands <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=timehands>;
>                 gen <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=gen> = th->th_generation;
>                 *bt <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=bt> = th->th_offset;
>                 bintime_addx <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=bintime_addx>(bt <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=bt>, th->th_scale * tc_delta <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=tc_delta>(th));
>         } while (gen <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=gen> == 0 || gen <http://fxr.watson.org/fxr/ident?v=FREEBSD10;i=gen> != th->th_generation);
> }
>
> --
brandon s allbery kf8nh                               sine nomine associates
allbery.b@gmail.com                                  ballbery@sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net