Re: Reliability of RPC services

[Bas Wijnen]

On Tue, Apr 25, 2006 at 10:32:36AM +0200, Michal Suchanek wrote:
> > Concerning "reusable vs. send once": All reply capabilities are
> > invalidated by send. This is necessary in order to guarantee that every
> > call receives at most one reply. This is, in fact, the *only* difference
> > between a reply capability and a send capability.
> 
> How is it invalidated by send if there are multiple copies? Who finds
> all the copies to invalidate them?

Capabilities are very much like pointers.  Invalidating them doesn't do
anything to the "pointer" itself, but to the object it points to.  So it says:
pointers to here can no longer be used.  If anyone else will later try anyway,
the object will refuse it.  It doesn't actually do anything to the other
copies.  If it would, it could potentially take ages to complete.

Thanks,
Bas

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