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Jesus asked him, "What is your name?" And he said, "My name is Legion, for we are many." ── Gospel of Mark chapter 5, verse 9



(defparameter *worker*
    (let ((out *standard-output*))
      (lambda (worker)
        (multiple-value-bind (val existsp)
            (next-job worker)
          (format out "Processed: ~S~%" val))))))

(start-worker *worker*)

(add-job *worker* 10)
(add-job *worker* "Hi")

(stop-worker *worker*)


(defparameter *cluster*
  (make-cluster 4
    (let ((out *standard-output*))
      (lambda (worker)
        (multiple-value-bind (val existsp)
            (next-job worker)
          (format out "Processed: ~S~%" val))))))

(start-cluster *cluster*)

(add-job *cluster* 10)
(add-job *cluster* "Hi")

(stop-cluster *cluster*)

NOTE: Cluster doesn't guarantee the order of processing jobs.


[Structure] worker

Base structure class of workers.

[Function] (make-worker process-fn &key (queue-size 128))

Create and return a worker thread which has a fixed-length queue. process-fn is a funcallable object which takes a single value.

You can specify the value by specifying :queue-size. The default value is 128.

[Function] (worker-status worker)

Return the worker's status which is specifically one of :running, :idle, :shutting and :shutdown.

[Function] (worker-queue-count worker)

Return the number of outstanding jobs of the worker.

[Function] (start-worker worker)

Start the given worker to process jobs.

[Function] (stop-worker worker)

Stop the given worker after processing its queued jobs.

[Function] (kill-worker worker)

Stop the given worker immediately (outstanding jobs will be remained in its queue).

[Function] (add-job worker-or-cluster val)

Enqueue a new job val which will be passed to a function specified for make-worker.

[Function] (next-job worker) => val, existsp

Dequeue a job from worker's queue.

[Structure] cluster

Base structure class of clusters.

[Function] (make-cluster worker-num process-fn &key (queue-size 128) scheduler)

Create and return a cluster with worker-num workers with process-fn.

You can specify a scheduler function which takes exact 2 arguments -- workers and a job -- for task-scheduling. The default is round-robin scheduler.

[Function] (cluster-status cluster)

Return the cluster's status which is one of :running, :shutting and :shutdown.

[Function] (start-cluster cluster)

Start workers of cluster.

[Function] (cluster-workers cluster) => workers-array

Return workers of cluster in simple-array.


  • Eitaro Fukamachi (e.arrows@gmail.com)

Copyright (c) 2015 Eitaro Fukamachi (e.arrows@gmail.com)


Licensed under the BSD 2-Clause License.

Eitaro Fukamachi
BSD 2-Clause