Re: [ECOS] sigwait not returning

[Nick Garnett <nickg at ecoscentric dot com>]

"N.Suresh" <nsuresh@cdotb.ernet.in> writes:

> Hi,
>     We tried delivering the signal to a sigwait () call:
>         *) Using alarm () function --- Working.
>         *) pthread_kill () function ---  Working.
> 
>     It looks like only in the case of timer_create () case, the
> sigwait is not returning.
> 
>     We traced the call and found that in the following piece of code,
> signal_sigwait condition variable's queue is empty.
>     So it is not calling the broadcast method which will wake the
> sigwait thread.
>     It is releasing the thread, and in next POSIX_ASR call, the
> cyg_deliver_signals function is calling  _exit because there
>      is no signal handler registered for this thread.
>       All these functions are getting called only if i unmask the
> signal in the thread before calling the sigwait.
>      Otherwise the check in the alarm_action function whether thread
> is accepting this signal will fail.
>      Are we on the right path of debugging?
> 

Sort of. I've been looking at this myself. The problem is that the
timer alarm_action() routine should broadcast the signal_sigwait
condition variable the same way that sigalrm_action() does.

I have this fixed locally. However, We've been having power cuts here
and I haven't had time to check it in to the repository. I'll try to
do that later today.


-- 
Nick Garnett - eCos Kernel Architect
http://www.eCosCentric.com/


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