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;; wait for server=start-last to be three seconds old
;;
(define (server:wait-for-server-start-last-flag areapath)
(let* ((start-flag (conc areapath "/logs/server-start-last")))
(if (file-exists? start-flag)
(let* ((fmodtime (file-modification-time start-flag))
(reftime (+ 3 (random 5)))
(delta (- (current-seconds) fmodtime)))
(if (> delta reftime) ;; good enough
(begin
(debug:print-info 0 *default-log-port* "Ready to start server, last start: "
fmodtime ", delta: " delta ", reftime: " reftime)
(system (conc "touch " start-flag))) ;; lazy but safe
(begin
(thread-sleep! 5)
(server:wait-for-server-start-last-flag areapath))))
(system (conc "touch " start-flag)))))
;; kind start up of servers, wait 40 seconds before allowing another server for a given
;; run-id to be launched
;;
(define (server:kind-run areapath)
;; look for $MT_RUN_AREA_HOME/logs/server-start-last
;; and wait for it to be at least 3 seconds old
(server:wait-for-server-start-last-flag areapath)
(if (not (server:check-if-running areapath)) ;; why try if there is already a server running?
(let* ((last-run-dat (hash-table-ref/default *server-kind-run* areapath '(0 0))) ;; callnum, whenrun
(call-num (car last-run-dat))
(when-run (cadr last-run-dat))
(run-delay (+ (case call-num
((0) 0)
((1) 20)
((2) 300)
(else 600))
(random 5))) ;; add a small random number just in case a lot of jobs hit the work hosts simultaneously
(lock-file (conc areapath "/logs/server-start.lock")))
(if (> (- (current-seconds) when-run) run-delay)
(begin
(common:simple-file-lock-and-wait lock-file expire-time: 15)
(server:run areapath)
(thread-sleep! 2) ;; don't release the lock for at least a few seconds
(common:simple-file-release-lock lock-file)))
(hash-table-set! *server-kind-run* areapath (list (+ call-num 1)(current-seconds))))))
;; this one seems to be the general entry point
;;
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;; wait for server=start-last to be three seconds old
;;
(define (server:wait-for-server-start-last-flag areapath)
(let* ((start-flag (conc areapath "/logs/server-start-last")))
(if (file-exists? start-flag)
(let* ((fmodtime (file-modification-time start-flag))
(reftime (+ 2 (random 3)))
(delta (- (current-seconds) fmodtime))
(all-go (> delta reftime)))
(if all-go
#t ;; (system (conc "touch " start-flag)) ;; lazy but safe
(begin
(debug:print-info 0 *default-log-port* "Gating server start, last start: "
fmodtime ", delta: " delta ", reftime: " reftime ", all-go=" all-go)
(thread-sleep! 5)
(server:wait-for-server-start-last-flag areapath))))
#;(system (conc "touch " start-flag)))))
;; kind start up of servers, wait 40 seconds before allowing another server for a given
;; run-id to be launched
;;
(define (server:kind-run areapath)
;; look for $MT_RUN_AREA_HOME/logs/server-start-last
;; and wait for it to be at least 3 seconds old
(server:wait-for-server-start-last-flag areapath)
(if (not (server:check-if-running areapath)) ;; why try if there is already a server running?
(let* ((last-run-dat (hash-table-ref/default *server-kind-run* areapath '(0 0))) ;; callnum, whenrun
(call-num (car last-run-dat))
(when-run (cadr last-run-dat))
(run-delay (+ (case call-num
((0) 0)
((1) 20)
((2) 300)
(else 600))
(random 5))) ;; add a small random number just in case a lot of jobs hit the work hosts simultaneously
(lock-file (conc areapath "/logs/server-start.lock")))
(if (> (- (current-seconds) when-run) run-delay)
(let* ((start-flag (conc areapath "/logs/server-start-last")))
(common:simple-file-lock-and-wait lock-file expire-time: 15)
(system (conc "touch " start-flag)) ;; lazy but safe
(server:run areapath)
(thread-sleep! 2) ;; don't release the lock for at least a few seconds
(common:simple-file-release-lock lock-file)))
(hash-table-set! *server-kind-run* areapath (list (+ call-num 1)(current-seconds))))))
;; this one seems to be the general entry point
;;
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