pro Digest, Vol 4, Issue 13

[Steve Morin]

Thanks for all the responses this is great

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1. How to interact with a running lisp instance? (Steve Morin)
2. Re: How to interact with a running lisp instance? (Jack Harper)
3. Re: How to interact with a running lisp instance? (David Owen)
4. Re: How to interact with a running lisp instance? (Peter Herth)
5. Re: How to interact with a running lisp instance? (Tom Emerson)
6. Re: How to interact with a running lisp instance? (Sam Steingold)
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Message: 1
Date: Thu, 16 Dec 2010 09:25:32 -0800
Subject: [pro] How to interact with a running lisp instance?
Content-Type: text/plain; charset="iso-8859-1"
How to interact with a running lisp instance? I have been trying to figure
this out. I know this is being done with slime. Does any one have any
good
pointer on this. I am thinking of writing a web application and would like
to be able to update it on the fly for updates and bug fixes.
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Message: 2
Date: Fri, 17 Dec 2010 09:05:36 -0500
Subject: Re: [pro] How to interact with a running lisp instance?
Content-Type: text/plain; charset=us-ascii
...an interesting idea.
Years ago (1984), I had dinner with Nils Nilsson (AI pioneer) and he
mentioned the idea that he wanted to build a system that once alive would
never be powered down again - in his view a minor but necessary prerequisite
of an AI system.
It will be interesting to see what people will say about how to do this.
Regards to the List
Jack Harper
Secure Outcomes Inc
Sent from my iPhone

How to interact with a running lisp instance? I have been trying to

figure this out. I know this is being done with slime. Does any one have
any good pointer on this. I am thinking of writing a web application and
would like to be able to update it on the fly for updates and bug fixes.

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Message: 3
Date: Fri, 17 Dec 2010 08:31:31 -0700 (MST)
Subject: Re: [pro] How to interact with a running lisp instance?
Content-Type: text/plain; charset="iso-8859-1"

How to interact with a running lisp instance? ?I have been trying to

figure

this out. ?I know this is being done with slime. ?Does any one have any

good

pointer on this. ?I am thinking of writing a web application and would

like

to be able to update it on the fly for updates and bug fixes.

I run a Lisp webapp from detachtty. It leaves a Unix socket around so you
can talk to the fake tty later. I have done live-updates using this.
http://www.cliki.net/detachtty
Whether you pass functions as functions or symbols in various places can
have an impact on your ability to do a live update (symbols being an
indirect reference, are more conducive).
-David
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Message: 4
Date: Fri, 17 Dec 2010 16:34:44 +0100
Subject: Re: [pro] How to interact with a running lisp instance?
Content-Type: text/plain; charset=ISO-8859-1
Hi Steve,
when I am running server-style lisp applications, I actually do start
swank (the lisp side of slime) in it and at any time I wish, I can
connect with slime to it and interact.
Peter
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Message: 5
Date: Fri, 17 Dec 2010 10:35:20 -0500
Subject: Re: [pro] How to interact with a running lisp instance?
Content-Type: text/plain; charset="utf-8"
The following blog post describes how to get Hunchentoot running on a Linux
box with Swank running so that you can connect to the Lisp instance running
http://blog.ponto-dot.com/2010/08/15/setting-up-common-lisp-on-a-web-server

How to interact with a running lisp instance? I have been trying to

figure

this out. I know this is being done with slime. Does any one have any

good

pointer on this. I am thinking of writing a web application and would

like

to be able to update it on the fly for updates and bug fixes.
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--
Tom Emerson
http://treerex.blogspot.com/
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Message: 6
Date: Fri, 17 Dec 2010 10:33:50 -0500
Subject: Re: [pro] How to interact with a running lisp instance?
Content-Type: text/plain; charset=UTF-8

How to interact with a running lisp instance? ?I have been trying to

figure

this out. ?I know this is being done with slime. ?Does any one have any

good

pointer on this. ?I am thinking of writing a web application and would

like

to be able to update it on the fly for updates and bug fixes.

if you have started something at the REPL, you can interrupt the
process (Ctrl-C or something like that)
and bet a "break" prompt, from which you can do everything you can do
from the regular prompt: load/compile files,
define functions, fix bugs &c &c &c.
Then you should be able to continue the process you just interrupted.
A less generic answer would be to start an extra thread which would be
listening on a port and then you can connect to that port to get a
lisp prompt without interrupting all the other processes currently
running.
Then you can do everything (load/compile files, define functions, fix
bugs &c &c &c) and the lisp should be able to figure out which
processes have to be stopped for which actions (e.g., a process using
CLOS might have to be stopped while low-level MOP stuff is redefined).
You (and the lisp implementors) have to be careful, of course, about
the safe points when things can be interrupted and watch out for the
little things like if you interrupt lisp inside a recursive function F
and redefine F, or if you redefine F by connecting to a separate
thread, then you don't know whether the recursive calls to F will be
using the new or the old definition of F unless you disassemble the
old definition of F and find out whether the recursive call is
compiled as a jump (old definition will be used) or as a (FUNCALL #'F)
(also old definition) or as a (FUNCALL 'F) (new definition will be
used).
--
Sam Steingold <http://sds.podval.org>
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End of pro Digest, Vol 4, Issue 13
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