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Oslib

Getpid

Get the current process identification (PID) number.

Signature
(getpid &optional (state 'state)) → (mv pid new-state)
Returns: pid — The Process ID for this ACL2 session on success, or nil on failure.
Type (or (natp pid) (not pid)).; new-state — Type (state-p1 new-state), given (force (state-p1 state)).

This will just fail if called on an unsupported Lisp.

Definitions and Theorems

Function: getpid-fn

(defun getpid-fn (state)
  (declare (xargs :stobjs (state)))
  (declare (xargs :guard t))
  (let ((__function__ 'getpid))
    (declare (ignorable __function__))
    (b* ((- (raise "Raw Lisp definition not installed?"))
         ((mv err val state)
          (read-acl2-oracle state))
         ((when err) (mv nil state)))
      (mv (nfix val) state))))

Theorem: return-type-of-getpid.pid

(defthm return-type-of-getpid.pid
  (b* (((mv ?pid ?new-state)
        (getpid-fn state)))
    (or (natp pid) (not pid)))
  :rule-classes :type-prescription)

Theorem: state-p1-of-getpid.new-state

(defthm state-p1-of-getpid.new-state
  (implies (force (state-p1 state))
           (b* (((mv ?pid ?new-state)
                 (getpid-fn state)))
             (state-p1 new-state)))
  :rule-classes :rewrite)

Theorem: w-state-of-getpid

(defthm w-state-of-getpid
  (b* (((mv ?pid ?new-state)
        (getpid-fn state)))
    (equal (w new-state) (w state))))