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;;;; TODO
(in-package :wait-group)
(defclass wait-group ()
((counter
:initform 0
:accessor counter
:documentation "Count of jobs to wait for."))
(:documentation "Block waiting for jobs to finish."))
(defmethod print-object ((object wait-group) stream)
(print-unreadable-object (object stream :type t)
(with-slots (counter) object
(format stream ":counter ~s" counter))))
(defun make-wait-group ()
"Make a wait-group instance."
(make-instance 'wait-group))
(defgeneric add (wait-group &optional amount)
(:documentation "Track a new job in the group."))
(defmethod add ((wait-group wait-group) &optional (amount 1))
(incf (counter wait-group) amount))
(defgeneric done (wait-group)
(:documentation "Stop tracking a job in the group."))
(defmethod done ((wait-group wait-group))
(decf (counter wait-group)))
(defgeneric wait (wait-group)
(:documentation "Block waiting for tracked jobs to finish."))
(defmethod wait ((wait-group wait-group))
(loop until (<= (counter wait-group) 0)))
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