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From: Jan Kiszka <kiszka@domain.hid>
To: Paolo Gai <pj@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] Xenomai 2.0.1 - Posix Skin - implementing a periodic thread
Date: Tue, 13 Dec 2005 19:22:54 +0100	[thread overview]
Message-ID: <439F117E.7030606@domain.hid> (raw)
In-Reply-To: <439F0B78.2000002@domain.hid>

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Paolo Gai wrote:
> Dear all,
> 
> here is another small demo... this time of a periodic thread in POSIX.
> 
> It works under Xenomai, but it fails under Posix Real-Time.
> 
> The reason of the failure is the SIGUSR1 not being blocked by the main
> thread. If in main() the comments below the note "// REMOVE THE COMMENTS
> BELOW" are removed, then the signal is masked also in the main(), and as
> a result the POSIX version works.
> 
> The question I have is if the behavior in Xenomai (that is, not failing
> like the POSIX counterpart) is correct or not...
> 

Without having read your program in details and thought about the signal
behaviour as well, just two general remarks:

1. Signals are not yet supported by Xenomai in primary mode. All you
receive are Linux signals so that the real-time thread is effectively
running only in secondary mode (also due to the printf).

2. Periodic threads can be set up more easily and efficiently under
POSIX by using clock_nanosleep with absolute timeouts.

Jan


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  reply	other threads:[~2005-12-13 18:22 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-12-13 17:57 [Xenomai-help] Xenomai 2.0.1 - Posix Skin - implementing a periodic thread Paolo Gai
2005-12-13 18:22 ` Jan Kiszka [this message]
2005-12-13 20:27 ` Gilles Chanteperdrix

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