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(define (common:unix-ping hostname)
  (let ((res (system (conc "ping -c 1 " hostname " > /dev/null"))))
    (eq? res 0)))

;; ideally put all this info into the db, no need to preserve it across moving homehost
;;
(define (common:get-least-loaded-host hosts)
  (if (null? hosts)
      #f
      ;;
      ;; stategy:
      ;;    sort by last-used and normalized-load
      ;;    if last-updated > 15 seconds then re-update
      ;;    take the host with the lowest load with the lowest last-used (i.e. not used for longest time)
      ;;
      (let ((best-host #f)
	    (curr-time (current-seconds)))
	(for-each
	 (lambda (hostname)
	   (let* ((rec       (let ((h (hash-table-ref/default *host-loads* hostname #f)))
			       (if h
				   h
				   (let ((h (make-host)))
				     (hash-table-set! *host-loads* hostname h)
				     h))))
		  ;; if host hasn't been pinged in 15 sec update it's data
		  (ping-good (if (< (- curr-time (host-last-update rec)) 15)
				 (host-reachable rec)
				 (or (host-reachable rec)
				     (begin
				       (host-reachable-set! rec (common:unix-ping hostname))
				       (host-last-update-set! rec curr-time)
				       (host-last-cpuload-set! rec (common:get-normalized-cpu-load hostname))
				       (host-reachable rec))))))
	     (cond
	      ((not best-host)
	       (set! best-host hostname))
	      ((and ping-good
		    (< (alist-ref 'adj-core-load (host-last-cpuload rec))
		       (alist-ref 'adj-core-load
				  (host-last-cpuload (hash-table-ref *host-loads* best-host)))))
	       (set! best-host rec)))))
	 hosts)
	best-host)))
(define (common:get-least-loaded-host hosts-raw)
  (let* ((hosts (filter (lambda (x)
                          (string-match (regexp "^\\S+$") x))
                        hosts-raw)))
    (if (null? hosts)
        #f
        ;;
        ;; stategy:
        ;;    sort by last-used and normalized-load
        ;;    if last-updated > 15 seconds then re-update
        ;;    take the host with the lowest load with the lowest last-used (i.e. not used for longest time)
        ;;
        (let ((best-host #f)
              (curr-time (current-seconds)))
          (for-each
           (lambda (hostname)
             (let* ((rec       (let ((h (hash-table-ref/default *host-loads* hostname #f)))
                                 (if h
                                     h
                                     (let ((h (make-host)))
                                       (hash-table-set! *host-loads* hostname h)
                                       h))))
                    ;; if host hasn't been pinged in 15 sec update it's data
                    (ping-good (if (< (- curr-time (host-last-update rec)) 15)
                                   (host-reachable rec)
                                   (or (host-reachable rec)
                                       (begin
                                         (host-reachable-set! rec (common:unix-ping hostname))
                                         (host-last-update-set! rec curr-time)
                                         (host-last-cpuload-set! rec (common:get-normalized-cpu-load hostname))
                                         (host-reachable rec))))))
               (cond
                ((not best-host)
                 (set! best-host hostname))
                ((and ping-good
                      (< (alist-ref 'adj-core-load (host-last-cpuload rec))
                         (alist-ref 'adj-core-load
                                    (host-last-cpuload (hash-table-ref *host-loads* best-host)))))
                 (set! best-host hostname)))))
           hosts)
          best-host))))

(define (common:wait-for-cpuload maxload numcpus waitdelay #!key (count 1000) (msg #f)(remote-host #f))
  (let* ((loadavg (common:get-cpu-load remote-host))
	 (first   (car loadavg))
	 (next    (cadr loadavg))
	 (adjload (* maxload numcpus))
	 (loadjmp (- first next)))