Max messages in Message Queue
S.Bitton at sstl.co.uk
Tue Jun 16 07:44:17 UTC 2009
Also note that the message creation failure ends up crashing my
application and RTEMS returns a PANIC ERROR 6.
From: Samuel Bitton
Sent: 16 June 2009 08:20
To: rtems-users at rtems.org
Subject: RE: Max messages in Message Queue
It cannot be too many queues as I can create the queue ok with 100
messages in it.
Note that I get the error when I call create with 500 messages.
Also note that I don't think it is a memory issue as for 100 messages
the message size is set to 33 bytes and for the 500 messages case, I set
the message size to 5 bytes only. So in theory this would require as
much memory (unless RTEMS uses a lot of overhead on a per message
So to me there is a limiting factor for the number of messages per
From: Joel Sherrill [mailto:joel.sherrill at oarcorp.com]
Sent: 15 June 2009 17:49
To: Samuel Bitton
Cc: rtems-users at rtems.org
Subject: Re: Max messages in Message Queue
Samuel Bitton wrote:
> I have a local message queue defined with the maximum number of
> set to 100 and the max size for each message set to 33 bytes.
> All is fine so far. But when I try to increase the max number of
> messages to 500 I get an RTEMS_TOO_MANY error.
> In the manual I can't find a configuration constant that would limit
> size of message queues.
> I've tried increasing the task stack size accordingly but no luck.
> Any suggestion as to what my might the source of my problem?
You didn't add memory for the additional messages but
RTEMS_TOO_MANY indicates that there are either too
many queues (returned from create) or too many messages
in the queue -- full (returned from send).
Maybe something didn't get recompiled.
> Many thanks
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