Re: For review: timer_settime.2

[Peter Zijlstra <a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>]

On Tue, 2009-02-10 at 14:54 +1300, Michael Kerrisk wrote:
>        If the value of the CLOCK_REALTIME clock is adjusted  while  an
>        absolute  timer  based on that clock is armed, then the expira-
>        tion of the timer will be appropriately adjusted.   Adjustments
>        to  the  CLOCK_REALTIME clock have no effect on relative timers
>        based on that clock.

I cannot find this to be true.

>From what I can make of the code, clock_settime() ends up calling
do_sys_settimeofday() for CLOCK_REALTIME (and the other clocks).

It is, however, not treating relative/abs timers any differently.

Both get converted to an absolute expiration time when set.

If POSIX mandates that we keep relative timers unchanged when we change
the underlying clock, we'd have to iterate all pending timers and reset
them.



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