Memory protection was Re: change log for rtems (2011-10-21)

[Peter Dufault]

On Oct 25, 2011, at 4:18 , Joel Sherrill wrote:

> Stack protection is likely to result in a violation of the POSIX
> process/thread model.  RTEMS is best compared to a thread
> implementation in a user space library in POSIX process terms.
> 

I wouldn't be so sure.  I've worked on such systems in the past (pre-POSIX) and found them very valuable.

You will need to recode to take advantage - e.g. pthread_mutex_init() will fail when it determines an object isn't shared, etc.  That's not a drawback since a protected stack system is going to need to be coded from the ground up, but you'll still be able to use familiar interfaces subject to understandable restrictions.

Peter
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Peter Dufault
HD Associates, Inc.      Software and System Engineering