On Fri, 18 Feb 2000, Matthew Dillon wrote:
> :Currently, the threads library only creates one guard page
> :at the top (or bottom depending on how you look at it) of
> :each threads stack (for stacks of default size). Thread
> :stacks are allocated in sequential zones, so they are always
> :placed on top of the previous threads stack, and thus already
> :have a guard page below the stack.
> :
> :Correct me if I'm wrong, but using MAP_STACK|MAP_GUARDED
> :would allocate one additional guard page for each threads
> :stack.
> :
> :DanE.
>
> Correct. At the moment MAP_GUARDED is a 'generic' guarding flag
> and makes no assumptions about the areas being adjoining. It doesn't
> cost us anything.
Any problem if we overlay a previously MAP_GUARDED page with another
(to save an extra guard page)?
Dan Eischen
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