Re: [9fans] stack reclamation on Unix using clone, rfork_thread, etc.

[Philippe Anel <xigh@free.fr>]

At 04:39 PM 6/4/2004, you wrote:
>Anyone have any idea how one is supposed to arrange
>to free the stack on which a shared-memory proc is
>running?
>
>In my current implementation, I have a routine called
>stackalloc() that keeps a list of all stacks ever allocated
>along with the pids they were allocated for, and every Nth
>time it gets called, it scans the list freeing the stacks that
>correspond to processes that no longer exist.
>
>Damn TLB-friendly operating systems.
>
>Russ

Hello,

I would associate each stack segment to an 'address space' structure
shared by each shared-memory process.
When the reference counter of this structure goes to zero, I would
free all the segment 'associated' to this structure (and free the structure 
:) ).

I thought plan9 doesn't share process stack segment, am i wrong ?
If it doesn't share these segments you only have to free the stack when the
process is ending.

         Philippe,