Calling rtems_io_lookup_name from within an ISR

[Jamie Bowman]

Joel

Thanks for your speedy response.

	Jamie 

-----Original Message-----
From: Joel Sherrill [mailto:joel.sherrill at oarcorp.com] 
Sent: 11 May 2010 17:25
To: Jamie.Bowman at steepestascent.com
Cc: rtems-users at rtems.org
Subject: Re: Calling rtems_io_lookup_name from within an ISR

On 05/11/2010 11:01 AM, Jamie Bowman wrote:
>
> All
>
> Hopefully this should be quite an easy one. Within the RTEMS 
> Documentation "c_user" it states that the following is a list of RTEMS 
> system calls that may be made from an ISR:
>
>     * IO Management
>
> The following services are safe to call from an ISR if and only if the 
> device driver service invoked is also safe. The IO Manager itself is 
> safe but the invoked driver entry point may or may not be. 
> rtems_io_initialize, rtems_io_open, rtems_io_close, rtems_io_read, 
> rtems_io_write, rtems_io_ control
>
> Is it safe to call an rtems_io_lookup_name from within an ISR?
>
No.  It uses the filesystem and that is not safe from ISRs.
>
> Kind regards
>
>             Jamie
>


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Joel Sherrill, Ph.D.             Director of Research&  Development
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