Re: Questions about copy-on-write

[Bas Wijnen]

Sam Mason wrote:
> I think the next challenge for me is to figure out how a task can
> revoke a mapping it gave to another task.  I guess I'll have to give
> the L4 a bit of a read. . .

In there you will find the systemcall unmap, which revokes a mapping 
recursively.  This cannot be used, because the task didn't physically do 
the mapping, that was only conceptually.  Only the task which did that 
can revoke it.  And that was physmem.  So to revoke a mapping, tell 
physmem to do it, and it'll be arranged.  :-)

Thanks,
Bas

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