+(defmacro without-interrupts (&body body)
+ #+lispworks `(mp:without-preemption ,@body)
+ #+allegro `(mp:without-scheduling ,@body)
+ #+cmu `(system:without-interrupts ,@body)
+ #+sbcl `(sb-sys::without-interrupts ,@body)
+ #+openmcl `(ccl:without-interrupts ,@body))
+
+(defun make-process-lock (name)
+ #+allegro (mp:make-process-lock :name name)
+ #+cmu (mp:make-lock name)
+ #+lispworks (mp:make-lock :name name)
+ #+openmcl (ccl:make-lock name)
+ #+sb-thread (sb-thread:make-mutex :name name)
+ #+scl (thread:make-lock name)
+ #-(or allegro cmu lispworks openmcl sb-thread scl) (declare (ignore name))
+ #-(or allegro cmu lispworks openmcl sb-thread scl) nil)
+
+(defmacro with-process-lock ((lock desc) &body body)
+ #+(or cmu allegro lispworks openmcl sb-thread)
+ (declare (ignore desc))
+ #+(or allegro cmu lispworks openmcl sb-thread)
+ (let ((l (gensym)))
+ `(let ((,l ,lock))
+ #+allegro (mp:with-process-lock (,l) ,@body)
+ #+cmu (mp:with-lock-held (,l) ,@body)
+ #+openmcl (ccl:with-lock-grabbed (,l) ,@body)
+ #+lispworks (mp:with-lock (,l) ,@body)
+ #+sb-thread (sb-thread:with-recursive-lock (,l) ,@body)
+ ))
+ #+scl `(thread:with-lock-held (,lock ,desc) ,@body)
+ #-(or cmu allegro lispworks openmcl sb-thread scl) (declare
+ (ignore lock desc))
+ #-(or cmu allegro lispworks openmcl sb-thread scl) `(progn ,@body))