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On Fri, Aug 22, 2003 at 02:27:08PM -0400, der Mouse wrote:
> >> how does one pin dynamically allocated memory in libc (so that it
> >> could be used by an interrupt handler)?
> > You can't, and shouldn't be trying to.
> 
> Can't?  Isn't that what mlock() does?

>That will lock the memory backing the user processes virtual address,
>doesn't mean you can access it from a random routine that isn't
>running in the context of the relevant process.

>I even think that mlock() will just guarantee than copy{in,out}()
>won't block - you still have to use the functions.

>It looks like what you are saying is true. AIX has a function inside the 
>kernel which pins user memory ie we are not supposed to use mlock() for 
>this purpose.

There is an equivalent call to mlock() on AIX -pin() which does the job of 
making it non-pageable. You do need to use copyin() over the pinned memory 
-as you have pointed out.

regards
-kamal






-- 
David Laight: david@l8s.co.uk