[Openmcl-devel] threads and special variables

bernard tatin bernard.tatin at tele2.fr
Wed Jan 12 20:34:45 UTC 2005


I wanted to do this :

-----------------------------------------
(defvar *var* nil)
(defparameter *param* nil)

(defun add-var (x)
   (+ x *var*))

(defun add-param (x)
   (+ x *param*))

(defun test ()
   (format t "add-var 4 : ~a add-param 4 ~a ~%"
           (add-var 4)
           (add-param 4)))

;; it works fine
(let ((*var* 1)
       (*param* 2))
   (test))


;; it does not work
(let ((*var* 1)
       (*param* 2))
   (PROCESS-RUN-FUNCTION "test" #'test))
-----------------------------------------

The output is :
-----------------------------------------
[LeMac:cpuview] narberd% openmcl --load tests-specialvars.lisp

;; it works fine
add-var 4 : 5 add-param 4 6

;; running the process fails
 > Error in process test(2): value NIL is not of the expected type NUMBER.
 > While executing: CCL::+-2


;;;
;;; #<PROCESS test(2) [Reset] #x63E5DB6> requires access to Shared 
Terminal Input
;;;

Welcome to OpenMCL Version (Beta: Darwin) 0.14.2-p1 CVS ccl-0.14 20041026!
?

-----------------------------------------

I understand that *var* and *param* have their initial value (nil) when 
the process "test" starts. I try to use make-process and the key 
argument initial-binding like that :

(make-process "test" :initial-bindings '(???))

but I don't understand what to put in the '(???).

Can you help me ?

Thanks,

Bernard.



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