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August 2003, Week 3

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Subject:
Re: What's a PIN?
From:
Stan Sieler <[log in to unmask]>
Reply To:
Stan Sieler <[log in to unmask]>
Date:
Wed, 20 Aug 2003 19:42:42 -0700
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Re:
> The internal PID is 32 bits containing a 16 bit PIN followed by a 16
> bit re-use count.

If you mean the one used by Process Management (e.g., map_pin_to_pid),
that's the type "proc_id_type" and is 64 bits ...
    16-bit "machine number" (always 0),
    16-bit PIN,
and 32-bit reuse count.

> The external PIN is a unique 16 bit number for the duration of the
> process and it's children.  PIN's are re-used by the system and
> hence are not unique over time, but they are unique across a single
> snapshot.

The process management PID (the 64-bit one) is unique during one
bootup of a system.  (Although I don't recall any code to
either reserve the PIN or kill the system if the reuse count for a
PIN overflows :)


Stan
--
Stan Sieler
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www.allegro.com/sieler/wanted/index.html

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