Arguments: symbol value
This macro does two things: (1) it sets the global value (as returned by global-symbol-value) of symbol to be the value of value (note: symbol is not evaluated, value is evaluated, just as in setq); (2) checks the relevant alists and modifies them as necessary.
Here is exactly what happens in (2). The system checks whether
symbol is the key of any pair in the alist which is the value of
*default-lisp-listener-bindings*; if it
is, the system changes the value of that pair to
If symbol is not the key of any pair on
system checks whether it is the key of any pair on
*cl-default-special-bindings*; if it
is, the system changes the value on that alist as above. If the symbol
is not the key of a pair on either list, the system adds the pair
(variable . (sys:global-symbol-value symbol))
*default-lisp-listener-bindings* is used
by the system only when listener processes (including the Initial Lisp
Listener which provides the prompt when Lisp comes up) are
created. Therefore, only those processes will see the value on the
alist and the symbol will be bound (meaning that changing it with
setf and setq will affect that
process only) on listeners. This macro does not affect the binding of
any running process. You should use this macro in your .clinit.cl or sys:siteinit.cl files and in custom.cl (used when the Lisp image is
built - see building-images.htm) only for
those symbols already on the
*cl-default-special-bindings* alist or the
unless you want to bind the symbol in Lisp-listener processes. Note
further the form
(setq variable value)
in the sys:siteinit.cl,
file or custom.cl file will
usually not change the value for a listener process for any variable
that does appear in either of the lists because the values on the
lists are often specific values (
10) and the binding is made to that specific value.
This operator is not available in Lisp images built with a minimal
top level, that is built with the
include-tpl argument to
Minimal top levels in
information on minimal top levels.
See top-level.htm for more information on the top level.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.