Megatest

     "SELECT count(id) FROM monitors WHERE last_update < (strftime('%s','now') - 300) AND username=?;"
     (car (user-information (current-user-id))))
    res))

;; register a task
(define (tasks:add mdb action owner target runname testpatt params)
  (sqlite3:execute mdb "INSERT INTO tasks_queue (action,owner,state,target,name,testpatt,params,creation_time,execution_time)
                       VALUES (?,?,'new',?,?,?,?,strftime('%s','now'),0);" 
		   action
		   owner
		   target
		   runname
		   testpatt

		   (if params params "")))

(define (keys:key-vals-hash->target keys key-params)
  (let ((tmp (hash-table-ref/default key-params (vector-ref (car keys) 0) "")))
    (if (> (length keys) 1)
	(for-each (lambda (key)
		    (set! tmp (conc tmp "/" (hash-table-ref/default key-params (vector-ref key 0) ""))))

		   (current-process-id)
		   (get-host-name)))

(define (tasks:set-state mdb task-id state)
  (sqlite3:execute mdb "UPDATE tasks_queue SET state=? WHERE id=?;" 
		   state 
		   task-id))

;;======================================================================
;; Access using task key (stored in params; (hash-table->alist flags) hostname pid
;;======================================================================

(define (tasks:param-key->id mdb task-params)
  (handle-exceptions
   exn
   #f
   (sqlite3:first-result mdb "SELECT id FROM tasks_queue WHERE params LIKE ?;" task-params)))

(define (tasks:set-state-given-param-key mdb param-key new-state)
  (sqlite3:execute mdb "UPDATE tasks_queue SET state=? WHERE params LIKE ?;" new-state param-key))

(define (tasks:get-records-given-param-key mdb param-key state-patt action-patt test-patt)
  (handle-exceptions
   exn
   '()
   (sqlite3:first-row mdb "SELECT id,action,owner,state,target,name,testpatt,keylock,params WHERE
         params LIKE ? AND state LIKE ? AND action LIKE ? AND testpatt LIKE ?;"
		      param-key state-patt action-patt test-patt)))


;;======================================================================
;; Rogue items, no place to put these yet
;;======================================================================

(define (tasks:find-task-queue-records mdb target run-name test-patt state-patt action-patt)
  ;; (handle-exceptions
  ;;  exn
  ;;  '()
  ;;  (sqlite3:first-row
  (let ((res '()))
    (sqlite3:for-each-row 
     (lambda (a . b)
       (set! res (cons (cons a b) res)))
     mdb "SELECT id,action,owner,state,target,name,testpatt,keylock,params FROM tasks_queue 
       WHERE
         target = ? AND name = ? AND state LIKE ? AND action LIKE ? AND testpatt LIKE ?;"
     target run-name state-patt action-patt test-patt)
    res)) ;; )


(define (tasks:kill-runner mdb target run-name)
  (let ((records    (tasks:find-task-queue-records mdb target run-name "%" "running" "run-tests"))
	(hostpid-rx (regexp "\\s+(\\w+)\\s+(\\d+)$"))) ;; host pid is at end of param string
    (if (null? records)
	(debug:print 0 "No run launching processes found for " target " / " run-name)
	(debug:print 0 "Found " (length records) " run(s) to kill."))
    (for-each 
     (lambda (record)
       (let* ((param-key (list-ref record 8))
	      (match-dat (string-search hostpid-rx param-key))
	      (hostname  (cadr match-dat))
	      (pid       (caddr match-dat)))
	 (debug:print 0 "Sending SIGINT to process " pid " on host " hostname)
	 (if (equal? (get-host-name) hostname)
	     (process-signal (string->number pid) signal/int)
	     ;;  (call-with-environment-variables
	     (let ((old-targethost (getenv "TARGETHOST")))
	       (set-environment-variable "TARGETHOST" hostname)
	       (system (conc "nbfake " kill " " pid))
	       (if old-targethost (set-environment-variable "TARGETHOST" old-targethost))))))
     records)))


;;======================================================================
;; The routines to process tasks
;;======================================================================

;; NOTE: It might be good to add one more layer of checking to ensure
;;       that no task gets run in parallel.