Re: [RFC PATCH 00/11] sched: CFS low-latency features

Peter Zijlstra
2010-08-27T07:37:53Z

On Thu, 2010-08-26 at 19:09 -0400, Mathieu Desnoyers wrote:
> > WTF can't the damned delivery thread not be created when timer_create
> > is called and the signal be delivered to that very thread directly via
> > SIGEV_THREAD_ID ?
>
> Yeah, that sounds exactly like what I proposed about an hour ago on IRC ;) I'm
> pretty sure that would work.
>
> The only thing we might have to be careful about is what happens if the timer
> re-fires before the thread completes its execution. We might want to let the
> signal handler detect these overruns somehow.

Simply don't use SIGEV_THREAD and spawn you own thread and use
SIGEV_THREAD_ID yourself, the programmer knows the semantics and knows
if he cares about overlapping timers etc.