AW: question about posix timer expiration

[Gabriel.Moyano at dlr.de]

Hi Chris,

Did you compile ptpd with kqueue only? I’ve tried with posix timer, which are implemented in rtems, but it seems that the handler with siginfo_t is not called correctly. I’ve managed to get it working using a workaround but I’ll continue with kqueue, thx!.

Regards,
Gabriel


Von: Chris Johns <chrisj at rtems.org>
Gesendet: Mittwoch, 19. Mai 2021 10:30
An: Moyano Heredia, Victor Gabriel <Gabriel.Moyano at dlr.de>
Cc: devel at rtems.org
Betreff: Re: question about posix timer expiration




On 18 May 2021, at 10:02 pm, Gabriel.Moyano at dlr.de<mailto:Gabriel.Moyano at dlr.de> wrote:

From further investigation I’ve found that when a timer expires, _POSIX_Timer_TSR() is called and this uses pthread_kill() to send a signal. Shouldn’t ptimer->inf.sigev_value be used here in order to create a siginfo_t object with the right value?

Did anyone have to deal with this while using posix timers?

Thanks!

Von: devel <devel-bounces at rtems.org<mailto:devel-bounces at rtems.org>> Im Auftrag von Gabriel.Moyano at dlr.de<mailto:Gabriel.Moyano at dlr.de>
Gesendet: Mittwoch, 12. Mai 2021 14:37
An: devel at rtems.org<mailto:devel at rtems.org>
Betreff: question about posix timer expiration

Hello everyone,

Currently I am trying to get running ptpd on rtems (following the Chris’ work, thx btw).

Ptpd uses posix timers and when a timer expires a handler with this signature void(int sig, siginfo_t *info, void *ucontext) is called.

Is this on libbsd? If it is I would have expected kqueue being used so I am not sure where this is happening.

Chris


 Unfortunately (*info) doesn’t have the right values, eg. info->si_code should be SI_TIMER but it is SI_USER and also info->si_signo should be the same as sig but it’s not.



Diving into the code I’ve found where the handler is called (also where *info is created). This is done in the function _POSIX_signals_Check_signal() in the file psignalunblockthread.c. It doesn’t seems that info is updated with the values (I guess) should take from object ptimer, which was created by create_timer().



My question is: is this handler fully supported? Or maybe I’m missing something else.



Thanks in advance,

Gabriel

——————————————————————————
Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
Institute for Software Technology | SC-OSS | Lilienthalplatz 7 | 38108 Braunschweig  | Germany

Gabriel Moyano | Research Scientist in Onboard Software Systems group
gabriel.moyano at dlr.de<mailto:gabriel.moyano at dlr.de>
DLR.de<http://www.dlr.de/>

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