Megatest

        #t)
      #f))

(define (std-exit-procedure)
  ;;(common:telemetry-log-close)
  (on-exit (lambda () 0))
  ;;(debug:print-info 13 *default-log-port* "std-exit-procedure called; *time-to-exit*="*time-to-exit*)
  (let ((no-hurry  (if (bdat-time-to-exit *bdat*) ;; hurry up
		       #f
		       (begin
			 (bdat-time-to-exit-set! *bdat* #t)
			 #t))))
    (debug:print-info 4 *default-log-port* "starting exit process, finalizing databases.")
    (if (and no-hurry (debug:debug-mode 18))
	(rmt:print-db-stats))
    (let ((th1 (make-thread (lambda () ;; thread for cleaning up, give it five seconds
                              (if *dbstruct-db* (db:close-all *dbstruct-db*)) ;; one second allocated
			      (if *task-db*    

        (tmp-mtdb        (dbr:dbstruct-tmpdb dbstruct))
        (tmp-mtpath      (db:dbdat-get-path tmp-mtdb)))
    (debug:print-info 0 *default-log-port* "Read-only periodic sync thread started.")
    (let loop ((last-sync-time 0))
      (debug:print-info 13 *default-log-port* "loop top tmp-mtpath="tmp-mtpath" golden-mtpath="golden-mtpath)
      (let* ((duration-since-last-sync (- (current-seconds) last-sync-time)))
        (debug:print-info 13 *default-log-port* "duration-since-last-sync="duration-since-last-sync)
        (if (and (not (bdat-time-to-exit *bdat*))
                 (< duration-since-last-sync sync-cool-off-duration))
            (thread-sleep! (- sync-cool-off-duration duration-since-last-sync)))
        (if (not (bdat-time-to-exit *bdat*))
            (let ((golden-mtdb-mtime (file-modification-time golden-mtpath))
                  (tmp-mtdb-mtime    (file-modification-time tmp-mtpath)))
	      (if (> golden-mtdb-mtime tmp-mtdb-mtime)
		  (if (< golden-mtdb-mtime (- (current-seconds) 3)) ;; file has NOT been touched in past three seconds, this way multiple servers won't fight to sync back
		      (let ((res (db:multi-db-sync dbstruct 'old2new)))
			(debug:print-info 13 *default-log-port* "rosync called, " res " records transferred."))))
              (loop (current-seconds)))
            #t)))
    (debug:print-info 0 *default-log-port* "Exiting readonly-watchdog timer, (bdat-time-to-exit *bdat*) = " (bdat-time-to-exit *bdat*)" pid="(current-process-id)" mtpath="golden-mtpath)))

;;======================================================================
;; from metadat lookup MEGATEST_VERSION
;;
(define (common:get-last-run-version) ;; RADT => How does this work in send-receive function??; assume it is the value saved in some DB
  (rmt:get-var "MEGATEST_VERSION"))

(define *bdat* #f) ;; the one and only (someday) global?

(defstruct bdat
  (home                   (getenv "HOME"))
  (user                   (getenv "USER"))
  (watchdog               #f)
  (time-to-exit           #f)
  (server-loop-heart-beat (current-seconds))
  )

(define (make-and-init-bigdata)
  (set! *bdat*
	(make-bdat)))
  

(define *my-client-signature* #f)
(define *transport-type*    'http)             ;; override with [server] transport http|rpc|nmsg
(define *runremote*         #f)                ;; if set up for server communication this will hold <host port>
;; (define *max-cache-size*    0)
(define *logged-in-clients* (make-hash-table))
(define *server-id*         #f)
(define *server-info*       #f)  ;; good candidate for easily convert to non-global
;; (define *time-to-exit*      #f)
(define *server-run*        #t)
(define *run-id*            #f)
(define *server-kind-run*   (make-hash-table))
(define *home-host*         #f)
;; (define *total-non-write-delay* 0)
(define *heartbeat-mutex*   (make-mutex))
(define *api-process-request-count* 0)

;; common:readonly-watchdo
;; common:watchdog
;; std-exit-procedure was here

(define (std-signal-handler signum)
  ;; (signal-mask! signum)
  (bdat-time-to-exit-set! *bdat* #t) 
  ;;(debug:print-info 13 *default-log-port* "got signal "signum)
  (debug:print-error 0 *default-log-port* "Received signal " signum " aaa exiting promptly")
  ;; (std-exit-procedure) ;; shouldn't need this since we are exiting and it will be called anyway
  (exit))

(define (special-signal-handler signum)
  ;; (signal-mask! signum)
  (bdat-time-to-exit-set! *bdat*  #t)
  ;;(debug:print-info 13 *default-log-port* "got signal "signum)
  (debug:print-error 0 *default-log-port* "Received signal " signum " sending email befor exiting!!")
  ;;TODO send email to notify admin contact listed in the config that the lisner got killed
  ;; (std-exit-procedure) ;; shouldn't need this since we are exiting and it will be called anyway
  (exit))

(set-signal-handler! signal/int  std-signal-handler)  ;; ^C

(define (http-transport:server-shutdown port)
  (begin
    ;;(BB> "http-transport:server-shutdown called")
    (debug:print-info 0 *default-log-port* "Starting to shutdown the server. pid="(current-process-id))
    ;;
    ;; start_shutdown
    ;;
    (set! (bdat-time-to-exit *bdat*) #t) ;; tell on-exit to be fast as we've already cleaned up
    (portlogger:open-run-close portlogger:set-port port "released")
    (thread-sleep! 1)

    ;; (debug:print-info 0 *default-log-port* "Max cached queries was    " *max-cache-size*)
    ;; (debug:print-info 0 *default-log-port* "Number of cached writes   " *number-of-writes*)
    ;; (debug:print-info 0 *default-log-port* "Average cached write time "
    ;; 		      (if (eq? *number-of-writes* 0)

	  (launch:setup) ;; should be properly in the run area home now
          
	  (set! tconfigreg (tests:get-all)) ;; mapping of testname => test source path
	  (let ((sighand (lambda (signum)
			   ;; (signal-mask! signum) ;; to mask or not? seems to cause issues in exiting
			   (if (eq? signum signal/stop)
			       (debug:print-error 0 *default-log-port* "attempt to STOP process. Exiting."))
			   (set! (bdat-time-to-exit *bdat*) #t)
			   (print "Received signal " signum ", cleaning up before exit (set this test to COMPLETED/ABORT) . Please wait...")
			   (let ((th1 (make-thread (lambda ()
                                                     (print "set test to COMPLETED/ABORT begin.")
						     (rmt:test-set-state-status run-id test-id "COMPLETED" "ABORT" "received kill signal")
                                                     (print "set test to COMPLETED/ABORT complete.")
						     (print "Killed by signal " signum ". Exiting")
						     (exit 1))))

            ((or (not (args:get-arg "-dumpmode"))
     	    (string=? (args:get-arg "-dumpmode") "ini"))
     	(configf:config->ini data))
            (else
     	(debug:print-error 0 *default-log-port* "-dumpmode of " (args:get-arg "-dumpmode") " not recognised")))
           (set! *didsomething* #t)
           (pop-directory)
           (bdat-time-to-exit-set! *bdat* #t)))
     
     (if (args:get-arg "-show-cmdinfo")
         (if (or (args:get-arg ":value")(getenv "MT_CMDINFO"))
     	(let ((data (common:read-encoded-string (or (args:get-arg ":value")(getenv "MT_CMDINFO")))))
     	  (if (equal? (args:get-arg "-dumpmode") "json")
     	      (json-write data)
     	      (pp data))

               (print (string-join table-header ","))
               (for-each (lambda(table-row)
                           (print (string-join (map ->string table-row) ",")))
     
                         
                                 table-rows))))
       (set! *didsomething* #t)
       (bdat-time-to-exit-set! *bdat* #t))
     
     
     
     ;; NOTE: list-runs and list-db-targets operate on local db!!!
     ;;
     ;; IDEA: megatest list -runname blah% ...
     ;;

     				       (begin
     					 (debug:print 0 *default-log-port* "WARNING: path given, " outputfile " is relative, prefixing with current directory")
     					 (conc (current-directory) "/" outputfile)))))
     		  (create-directory tempdir #t)
     		  (ods:list->ods tempdir ouf sheets))))
     	  ;; (system (conc "rm -rf " tempdir))
     	  (set! *didsomething* #t)
	  (bdat-time-to-exit-set! *bdat* #t)
	  ) ;; end if true branch (end of a let)
	) ;; end if
         ) ;; end if -list-runs

     ;; list-waivers
     (if (and (args:get-arg "-list-waivers")
     	 (launch:setup))
         (let* ((runpatt     (or (args:get-arg "-runname") "%"))
     	   (testpatt    (common:args-get-testpatt #f))
     	   (keys        (rmt:get-keys)) 
     	   (runsdat     (rmt:get-runs-by-patt

     
     ;;======================================================================
     ;; Exit and clean up
     ;;======================================================================
     
     (if (not *didsomething*)
         (debug:print 0 *default-log-port* help)
         (bdat-time-to-exit-set! *bdat* #t)
         )
     ;;(debug:print-info 13 *default-log-port* "thread-join! watchdog")
     
     ;; join the watchdog thread if it has been thread-start!ed  (it may not have been started in the case of a server that never enters running state)
     ;;   (symbols returned by thread-state: created ready running blocked suspended sleeping terminated dead)
     ;; TODO: for multiple areas, we will have multiple watchdogs; and multiple threads to manage
     (let* ((watchdog (bdat-watchdog *bdat*)))
       (if (thread? watchdog)
	   (case (thread-state watchdog)
	     ((ready running blocked sleeping terminated dead)
	      (thread-join! watchdog)))))
     
     (bdat-time-to-exit-set! *bdat* #t)
     
     (if (not (eq? *globalexitstatus* 0))
         (if (or (args:get-arg "-run")(args:get-arg "-runtests")(args:get-arg "-runall"))
             (begin
	       (debug:print 0 *default-log-port* "NOTE: Subprocesses with non-zero exit code detected: " *globalexitstatus*)
	       (exit 0))
             (case *globalexitstatus*

	  ;   (> run-count config-reruns))
 	  ;(set! run-count config-reruns))

    ;; (if (tasks:need-server run-id)(tasks:start-and-wait-for-server tdbdat run-id 10))

    (let ((sighand (lambda (signum)
		     ;; (signal-mask! signum) ;; to mask or not? seems to cause issues in exiting
		     (bdat-time-to-exit-set! *bdat* #t)
		     (print "Received signal " signum ", cleaning up before exit. Please wait...")
		     (let ((th1 (make-thread (lambda ()
					       ;; (let ((tdbdat (tasks:open-db)))
						 (rmt:tasks-set-state-given-param-key task-key "killed") ;; )
					       (print "Killed by signal " signum ". Exiting")
					       (thread-sleep! 3)
					       (exit))))

  (let* ((do-a-sync  (server:get-bruteforce-syncer dbstruct))
         (final-sync (server:get-bruteforce-syncer dbstruct fork-to-background: #t persist-until-sync: #t)))
    (when (and (not (args:get-arg "-sync-to-megatest.db")) ;; conditions under which we do not run the sync
	       (args:get-arg "-server"))
      
      (let loop ()
	(do-a-sync)
        (if (not (bdat-time-to-exit *bdat*)) (loop))) ;; keep going unless time to exit

      ;; time to exit, close the no-sync db here
      (final-sync)

      (if (common:low-noise-print 30)
	  (debug:print-info 0 *default-log-port* "Exiting watchdog timer, *time-to-exit* = "(bdat-time-to-exit *bdat*)" pid="(current-process-id)
			    )))))

(define (server:writable-watchdog-deltasync dbstruct)
  (thread-sleep! 0.054) ;; delay for startup
  (let ((legacy-sync  (common:run-sync?))
        (sync-stale-seconds (configf:lookup-number *configdat* "server" "sync-stale-seconds" default: 300))
	(debug-mode   (debug:debug-mode 1))
	(last-time    (current-seconds))
	(no-sync-db   (db:open-no-sync-db))
	(stmt-cache   (dbr:dbstruct-stmt-cache dbstruct))
        (sync-duration 0) ;; run time of the sync in milliseconds
        )
    (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 (bdat-time-to-exit *bdat*)))
	(let* (;;(dbstruct (db:setup))
	       (mtdb       (dbr:dbstruct-mtdb dbstruct))
	       (mtpath     (db:dbdat-get-path mtdb))
	       (tmp-area   (common:get-db-tmp-area))
	       (start-file (conc tmp-area "/.start-sync"))
	       (end-file   (conc tmp-area "/.end-sync")))
	  (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* ((need-sync        (>= *db-last-access* *db-last-sync*)) ;; no sync since last write
		   (sync-in-progress *db-sync-in-progress*)
                   (min-intersync-delay (configf:lookup-number *configdat* "server" "minimum-intersync-delay" default: 5))
		   (should-sync      (and (not (bdat-time-to-exit *bdat*))
                                          (> (- (current-seconds) *db-last-sync*) min-intersync-delay))) ;; sync every five seconds minimum, deprecated logic, can probably be removed
		   (start-time       (current-seconds))
                   (cpu-load-adj     (alist-ref 'adj-proc-load (common:get-normalized-cpu-load #f)))
		   (mt-mod-time      (file-modification-time mtpath))
		   (last-sync-start  (if (common:file-exists? start-file)
					 (file-modification-time start-file)
					 0))
		   (last-sync-end    (if (common:file-exists? end-file)
					 (file-modification-time end-file)
					 10))
                   (sync-period      (+ 3 (* cpu-load-adj 30))) ;; as adjusted load increases increase the sync period
		   (recently-synced  (and (< (- start-time mt-mod-time) sync-period) ;; not useful if sync didn't modify megatest.db!
					  (< mt-mod-time last-sync-start)))
		   (sync-done        (<= last-sync-start last-sync-end))
                   (sync-stale       (> start-time (+ last-sync-start sync-stale-seconds)))
		   (will-sync        (and (not (bdat-time-to-exit *bdat*))       ;; do not start a sync if we are in the process of exiting
                                          (or need-sync should-sync)
					  (or sync-done sync-stale)
					  (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
				" sync-done=" sync-done " sync-period=" sync-period)

		       (> (- start-time last-time) 60))
		  (begin
		    (set! last-time start-time)
		    (debug:print-info 4 *default-log-port* "timestamp -> " (seconds->time-string (current-seconds)) ", time since start -> " (seconds->hr-min-sec (- (current-seconds) *time-zero*))))))
	    
	    ;; keep going unless time to exit
	    ;;
	    (if (not (bdat-time-to-exit *bdat*))
		(let delay-loop ((count 0))
                  ;;(debug:print-info 13 *default-log-port* "delay-loop top; count="count" pid="(current-process-id)" this-wd-num="this-wd-num" *time-to-exit*="(bdat-time-to-exit *bdat*))
                                                            
		  (if (and (not (bdat-time-to-exit *bdat*))
			   (< count 6)) ;; was 11, changing to 4. 
		      (begin
			(thread-sleep! 1)
			(delay-loop (+ count 1))))
		  (if (not (bdat-time-to-exit *bdat*)) (loop))))
	    ;; time to exit, close the no-sync db here
	    (db:no-sync-close-db no-sync-db stmt-cache)
	    (if (common:low-noise-print 30)
		(debug:print-info 0 *default-log-port* "Exiting watchdog timer, *time-to-exit* = " (bdat-time-to-exit *bdat*)" pid="(current-process-id) ))))))) ;;" this-wd-num="this-wd-num)))))))