Re: [Xenomai-core] Watchdog / immediate Linux signal delivery

[Jan Kiszka <jan.kiszka@domain.hid>]

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Philippe Gerum wrote:
> Jan Kiszka wrote:
>> Philippe Gerum wrote:
>>> Jan Kiszka wrote:
>>>> Meanwhile I played with some light-weight approach to relax a thread
>>>> that received a signal (according to do_sigwake_event). Worked, but only
>>>> once due to a limitation (if not bug) of I-pipe x86: in __ipipe_run_isr,
>>>> it does not handle the case that a non-root handler may alter the
>>>> current domain, causing corruptions to the IPIPE_SYNC_FLAG states of the
>>>> involved domains.
>>> It is not a bug, this is wanted. ISR must neither change the current
>>> domain nor migrate CPU; allowing this would open Pandora's box.
>> And if there is no way to migrate from within an ISR, we can bury any
>> attempt to deliver signals to spinning Xenomai threads - or what other
>> context would remain to Xenomai for triggering migration?
>>
> 
> The two-phase solution I have mentioned would work.

I think you can only handle lethal signals that way, not non-lethal like
SIGSTOP.

Jan


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