Lisp File Lock

[Pihu_2024]

Dear Sir,

I want to lisp file locking prgramming.

any body please help me.

[Sea-Haven]

I did post the code needed, just did not wrap it.

(setq expire 20250000)
(if (> (fix (getvar 'cdate)) expire)
(progn (Alert "Oops ran out of time ")(exit))
)