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Re: emulating no-senders notifications in L4?

From: Yoshinori K. Okuji
Subject: Re: emulating no-senders notifications in L4?
Date: Thu, 20 Dec 2001 21:48:29 +0900
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At 20 Dec 2001 00:37:34 +0100,
Niels Möller wrote:
> Can the scheme above be improved (without adding security features
> like port-rigts to the kernel)?

If most RPCs are normal messages from a task having a send right to
one having a receive right, it might improve the performance to map
the arrays to every task in read-only mode, so that it can check if an
IPC is valid by itself. In this case, a sending thread does an IPC to a
receiving thread directly somehow, so this makes the context switches
half. This isn't good for "send once" rights, but I don't think "send
once" rights are used so often.

However, I'm not sure if L4-Hurd needs a central port right server. Is
it really necessary?

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