[Vm-dev] asserta(newUtcMicrosecondClock >= utcMicrosecondClock) failing

[Eliot Miranda]

On Sat, Dec 25, 2010 at 12:20 PM, Igor Stasenko <siguctua at gmail.com> wrote:

>
> On 25 December 2010 16:56, Mariano Martinez Peck <marianopeck at gmail.com>
> wrote:
> >
> > Hi everybody. I hope you are enjoying a wonderful and happy Christmas.
> >
> > Yesterday something weird happened with my cog vm. This assert was
> failing:
> >
> > "newUtcMicrosecondClock >= utcMicrosecondClock 127"
> >
> > a lot of times...
> >
> > I checked and this is line 127 of sqUnixHeartbeat.c. I am in a MacOS vm,
> but it seems that file is used anyway.
> >
> > Now...I have no idea why this assert was failing, nor its severity. What
> does it mean? there is something wrong?  where can I take a look?
> >
>
> if microseconds clock counter is 32-bit, then it wraps over time to time.
> VM should be aware that this may happen and should take appropriate
> measures (like adjusting the wait timeouts etc).
>

The microsecond clock is 64-bit to avoid precisely the possibility of the
clock wrapping within anything other than wildly optimistic predictions of
the possible life of Smalltalk.


> > It seems it is not easy to reproduce :(
> >
> yeah, you should wait another
> ~ 2^32  / 1000000 seconds
>

By all means but you won't see it wrap.


>
> > Thanks in advance,
> >
> > Mariano
> >
> >
>
>
>
> --
> Best regards,
> Igor Stasenko AKA sig.
>
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