[Openmcl-devel] defloadvar and def-ccl-pointers

Alan Ruttenberg alanr-l at mumble.net
Sat Nov 27 03:06:59 UTC 2004


When you are going to do a save-application and you need to 
reinitialize a variable when the lisp image starts again. For instance 
you might open a stream to a log file in your defvar. When you save a 
lisp image and exit, that stream gets closed. When the lisp application 
you saved starts again, if you try to write to the closed stream, you 
get an error.  Same deal if you allocate some non-lisp memory structure 
for use with a system call. In these cases use defloadvar and the 
variable initialization forms are run again when the lisp image 
restarts.

-Alan

On Nov 26, 2004, at 3:16 PM, alex crain wrote:

>
> What is the purpose of DEF-CCL-POINTERS?
> I can get a handle on what it does, but it's not clear why.
>
> Put another way, when and why should I use DEFLOADVAR instead of 
> DEFVAR?
>
> :alex
>
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