Date:	Thu, 12 Mar 1998 21:15:25 +0100 (MET)
Message-Id:	<199803122015.VAA29246@ask.diku.dk>
From:	Morten Welinder <terra AT diku DOT dk>
To:	sandmann AT clio DOT rice DOT edu
CC:	Vik DOT Heyndrickx AT rug DOT ac DOT be, eliz AT is DOT elta DOT co DOT il, bill AT taniwha DOT tssc DOT co DOT nz,
	djgpp-workers AT delorie DOT com
In-reply-to:	<9803121733.AA16133@clio.rice.edu> (sandmann@clio.rice.edu)
Subject:	Re: Temporary files considered unsafe

   True.  Things which are most likely to be unique:

   1) The cs selector value 
   2) The base virtual address of the cs selector
   3) PSP
   4) clock at startup

   A combination (sum? xor?) of these might be best for the PID.  There may
   be a pathaloigcal 1 in a million odds with something like this, but
   get a grip.

sum (which is monotonic) is better than xor for this kind of game.
As the Perl(?) docs mention, "x ^ y == (x + 1) ^ (y + 1)" entirely too
often.

Morten

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