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Re: UUIDGEN in lisp
From: |
Brad Collins |
Subject: |
Re: UUIDGEN in lisp |
Date: |
Mon, 16 Feb 2004 20:47:17 +0700 |
User-agent: |
Gnus/5.1002 (Gnus v5.10.2) Emacs/21.3 (windows-nt) |
Fantastic! Just as you said, moving (random t) outside the function
allows you to generate as many as you please. This is very helpful
for assigning ids to a large list of items at the same time. I don't
know how many you can assign at the same time (the spec says 10
million a unique ids in a second per machine). I wouldn't want to put
this little script to any test that big, but I would think it should
be okay for assigning a couple hundred or even a couple thousand items
at a time in a replace funcion....
Last question -- promise :)
I've looked this up in the elisp manual but don't really understand
what is going on. I noticed in the original script that the third
field always would begin with the number four. I started changing
things around and found if I changed the following,
(logior #B01000000 (logand #B11111111 (nth 7 bytes))))
^^^^^^
the numbers would be begin looking random again. What does `logior'
and `logand' actually do in the script and what does the string
#B01000000 mean? And how should they be set in this script? The
manual completely lost me.
Sorry to keep bugging you like this but I like to understand how
things work....
BTW I've been Googling to see how good /dev/random and /dev/urandom
are on cygwin. A number of people seem to have asked the same
question and it sounds like it's good enough for most purposes....
Thanks,
b/
--
Brad Collins
Chenla Labs
www.chenla.org
Bangkok, Thailand
- UUIDGEN in lisp, Brad Collins, 2004/02/13
- Re: UUIDGEN in lisp, Jesper Harder, 2004/02/13
- Re: UUIDGEN in lisp, Brad Collins, 2004/02/14
- Message not available
- Message not available
- Re: UUIDGEN in lisp, Jesper Harder, 2004/02/15
- Re: UUIDGEN in lisp, Eli Zaretskii, 2004/02/16
- Re: UUIDGEN in lisp,
Brad Collins <=
- Message not available
- Re: UUIDGEN in lisp, Jesper Harder, 2004/02/16
- Re: UUIDGEN in lisp, Eli Zaretskii, 2004/02/16
- Message not available
- Re: UUIDGEN in lisp, Jesper Harder, 2004/02/16
- Re: UUIDGEN in lisp, Eli Zaretskii, 2004/02/17
- Message not available
- Re: UUIDGEN in lisp, Jesper Harder, 2004/02/17
- Re: UUIDGEN in lisp, Eli Zaretskii, 2004/02/17
- Message not available
- Re: UUIDGEN in lisp, Jesper Harder, 2004/02/17
- Re: UUIDGEN in lisp, Eli Zaretskii, 2004/02/18
- Message not available
- Re: UUIDGEN in lisp, Stefan Monnier, 2004/02/19
- Message not available
- Re: UUIDGEN in lisp, Jesper Harder, 2004/02/16