Re: [ECOS] How to enable POSIX message queue in eCos environment?

[Andrew Lunn <andrew at lunn dot ch>]

On Wed, Jun 29, 2005 at 02:55:40PM -0500, Ellen wrote:
> Hi all,
> 
> I'm new to eCos and trying to run on Linux synthetic target.  Have a
> question here for using POSIX message queue in eCos.
> 
> I noticed in the reference manual, it is mentioned that "The presence
> of message queues is controlled by the CYGPKG_POSIX_MQUEUES option. 
> Setting this option will cause _POSIX_MESSAGE_PASSING to be defined
> and the message queue API to be make available."  In my case, I
> checked the ecos.ecc and pkgconf/isoinfra.h, I have the option
> CYGINT_ISO_MQUEUE (instead of CYGPKG_POSIX_MQUEUES) set to 0, which
> consequently makes the _POSIX_MESSAGE_PASSING undefined.  So when
> compiling, I got the error of undeclared "O_CREAT" and implicit
> declaration of "mq_open".
> 
> Since the CYGINT_ISO_MQUEUE is automatically defined in configtool, I
> went back to the configuration tool, try to set this option. 
> Unfortunately, I found that under the "POSIX message queues", the
> "maximum number of open message queues" is grey and its value is 0.
> 
> Anybody can help to set this mqueue option and make the message queue
> API available?

Use the posix template.

        Andrew

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