From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: "Jens Köhler" <jenskxxx@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] rt_queue_read and EPERM?
Date: Mon, 13 Sep 2010 13:57:03 +0200 [thread overview]
Message-ID: <4C8E118F.7010404@domain.hid> (raw)
In-Reply-To: <AANLkTik4rjQzwnU82OBudtkeS+kO+fbD1RjFXvXK7=qS@mail.gmail.com>
Jens Köhler wrote:
> Hello Gilles,
>
> here is the code:
>
> RT_QUEUE myqueue;
> int retval;
> retval = rt_queue_create(&myqueue, "myqueue", 255, 10, Q_FIFO);
>
> char message[100] = "Message ";
> retval = rt_queue_write(&myqueue,message,sizeof(message),Q_NORMAL);
> //retval is 0
>
> char msgBuf[255];
> retval = rt_queue_read(&myqueue, msgBuf, sizeof(msgBuf), TM_NONBLOCK);
> //retval is always -1, why?
Probably because the callling thread is not a Xenomai thread, it is a
simple Linux thread, and as such, is not allowed to switch to primary
mode as is required by rt_queue_read.
--
Gilles.
next prev parent reply other threads:[~2010-09-13 11:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-13 8:06 [Xenomai-help] rt_queue_read and EPERM? Jens Köhler
2010-09-13 9:07 ` Gilles Chanteperdrix
2010-09-13 10:59 ` Jens Köhler
2010-09-13 11:57 ` Gilles Chanteperdrix [this message]
2010-09-13 13:52 ` Jens Köhler
2010-09-13 14:15 ` Gilles Chanteperdrix
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