[Openmcl-devel] [CLSQL] Slime, CLSQL, and reader macros

[Gary Byers]

I'm not sure that i  remember the specific problem that you're referring to.

In CCL, many special variables (including those that affect the reader and
printer have thread-local bindings.)  I understand that this may not be
what one wants in every case , but if your code is intentionally creating
threads, having the value of e.g. *readtable* change in all threads
becausee of something done in one thread can be undesirable and hard to
track down and debug, and I think that there is at least a strong argument
that CCL's behavior in this case is a reasonable default.

I  don't like or use SLME and I don't know if its behavior has changed
since the last time that I tried to, but when I did I found that the
default behavior of editor commands which try to read a selection from an
editor buffer and execute the expression that was read is to execute that
expression in a newly created thread (with a new set of dynamic bindings)
I can't think of any way in which this behavor can be callled reasonable.)

If I ever knew how to override this behavior, I've long since forgotten.  I
understand that many people might find my solution - avoiding SLIME - a bit
drastic, but I I don't exactly miss SLIME.


On Wed, Mar 4, 2015 at 11:32 PM, Robert Cram <
robert at robertcramconstruction.com> wrote:

> I realize that this is an old thread, but the issue just came up for me.
> Perhaps it was answered or solved later, but I didn’t find so.
>
> A fix of some sort, in some versions of Clozure and emacs/slime, is this
> line:
>
> (setf clsql-sys::*original-readtable* nil)
>
> which resets the clsql readtable caching mechanism, which is unaware of
> the slime/mcl/ccl thread-specific readtable issue.
>
> Used like this:
>
> ;; Reset the mechanism.
> (setf clsql-sys::*original-readtable* nil)
>
> ;; Alter the read table.
> (clsql::enable-sql-reader-syntax)
>
> ;; Do whatever special syntax stuff you need to do:
> (defun blah (blah)
>   (clsql::select ‘blah
>                  :where [= [ ‘blah ‘blah]
>                  blah])
>   )
> ;; Disable the syntax….
>
> The point is that killing the cache needs to happen in the same evaluation
> as the code with the special syntax.
>
> I make no claim except that the original error goes away.
>
>
> Bob Cram
> Robert Cram Construction
> www.robertcramconstruction.com
> 415-613-8319
> robert at robertcramconstruction.com
> CA LIC 965300
>
>
> _______________________________________________
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>
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