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(in-package :wait-group)
(defclass wait-group ()
((counter
:initform 0
:accessor counter)))
(defun make-wait-group ()
(make-instance 'wait-group))
(defgeneric add (wait-group &optional amount)
(:documentation ""))
(defmethod add ((wait-group wait-group) &optional (amount 1))
(incf (counter wait-group) amount))
(defgeneric done (wait-group)
(:documentation ""))
(defmethod done ((wait-group wait-group))
(decf (counter wait-group)))
(defgeneric wait (wait-group)
(:documentation ""))
(defmethod wait ((wait-group wait-group))
(loop until (= (counter wait-group) 0)))
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