455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
|
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
|
+
+
-
+
-
+
+
+
+
+
-
+
+
+
|
;;
(define (server:writable-watchdog dbstruct)
(thread-sleep! 0.05) ;; delay for startup
(let ((legacy-sync (common:run-sync?))
(debug-mode (debug:debug-mode 1))
(last-time (current-seconds))
(no-sync-db (db:open-no-sync-db))
(sync-delay (string->number (or (configf:get *configdat* "server" "sync-delay") "5")))
(this-wd-num (begin (mutex-lock! *wdnum*mutex) (let ((x *wdnum*)) (set! *wdnum* (add1 *wdnum*)) (mutex-unlock! *wdnum*mutex) x))))
(set! *no-sync-db* no-sync-db) ;; make the no sync db available to api calls
(debug:print-info 2 *default-log-port* "Periodic sync thread started.")
(debug:print-info 3 *default-log-port* "watchdog starting. legacy-sync is " legacy-sync" pid="(current-process-id)" this-wd-num="this-wd-num)
(if (and legacy-sync (not *time-to-exit*))
(let* (;;(dbstruct (db:setup))
(mtdb (dbr:dbstruct-mtdb dbstruct))
(mtpath (db:dbdat-get-path mtdb)))
(debug:print-info 0 *default-log-port* "Server running, periodic sync started.")
(let loop ()
;; sync for filesystem local db writes
;;
(mutex-lock! *db-multi-sync-mutex*)
(let* ((load-too-high (> (common:get-normalized-cpu-load #f) 1))
(let* ((need-sync (>= *db-last-access* *db-last-sync*)) ;; no sync since last write
(> (- (current-seconds) *db-last-sync*) 5))) ;; sync every five seconds minimum
(> (- (current-seconds) *db-last-sync*)
(or (if load-too-high ;; if load is high increase delay to bigger of sync-delay or 15 sec
(max sync-delay 15)
#f)
sync-delay)))) ;; sync every five seconds minimum
(start-time (current-seconds))
(mt-mod-time (file-modification-time mtpath))
(recently-synced (< (- start-time mt-mod-time) 4))
(will-sync (and (or need-sync should-sync)
(will-sync (and (if load-too-high
should-sync
(or need-sync should-sync))
(not sync-in-progress)
(not recently-synced))))
(debug:print-info 13 *default-log-port* "WD writable-watchdog top of loop. need-sync="need-sync" sync-in-progress="sync-in-progress" should-sync="should-sync" start-time="start-time" mt-mod-time="mt-mod-time" recently-synced="recently-synced" will-sync="will-sync)
;; (if recently-synced (debug:print-info 0 *default-log-port* "Skipping sync due to recently-synced flag=" recently-synced))
;; (debug:print-info 0 *default-log-port* "need-sync: " need-sync " sync-in-progress: " sync-in-progress " should-sync: " should-sync " will-sync: " will-sync)
(if will-sync (set! *db-sync-in-progress* #t))
(mutex-unlock! *db-multi-sync-mutex*)
|