Re: [PATCH v2 1/3] process cputimer is moving faster than its corresponding clock

Olivier Langlois
2013-04-29T18:20:34Z

>
> >> I'm confused. glibc's rt/tst-cputimer1 doesn't have thread exiting code. I have
> >> no seen any issue in this accounting.
> >
> > glibc launch a helper thread to receive timer signal and will also
> > create a new thread upon signal reception when a timer is created with
> > sigev_notify = SIGEV_THREAD;
> >
> > please see:
> >
> > glibc-2.17/nptl/sysdeps/unix/sysv/linux/timer_create.c
> > glibc-2.17/nptl/sysdeps/unix/sysv/linux/timer_routines.c
>
> I know. I taled thread exiting. not thread creating. And, as far as I can see, only test sig1 can fail,
> not thr[12].
>
Apart from glibc helper thread, the threads created for handling timer
firing all do exit immediatly as soon as user callback returns.

I count 12 thread exits during tst-cputimer1 execution. The errors do
add up hence you're more likely to see errors after 2.5 sec and up from
start of execution. I have seen sig1, thr[12] fails. I see no reason why
one could not fail.