Megatest

                                 reason TEXT DEFAULT 'none',
                                   CONSTRAINT no_sync_processes UNIQUE (host,pid));"
			    ))))))
	 (on-tmp      (equal? (car (string-split dbpath "/")) "tmp"))
	 (db        (if on-tmp
			(dbfile:cautious-open-database dbname init-proc 1 "WAL" force-init: #t) ;; WAL MODE should use syncronous=1
			;; (dbfile:cautious-open-database dbname init-proc 0 #f    force-init: #t)
			(dbfile:cautious-open-database dbname init-proc 0 "MEMORY" force-init: #t) ;; Journal mode = memory is fastest?
			;; (sqlite3:open-database dbname)
			)))
    ;; (if on-tmp	      ;; done in cautious-open-database
    ;;    (begin
    ;; (sqlite3:execute db "PRAGMA synchronous = 0;") ;; why was this here when is is handled by cautious-open-database?
    (sqlite3:set-busy-handler! db (sqlite3:make-busy-timeout 136000)) ;; ))
    db))

;; mtest processes registry calls

(define (dbfile:insert-or-update-process nsdb dat)
  (let* ((host      (procinf-host dat))
	 (pid       (procinf-pid  dat))

(define (dbfile:register-process nsdb host port pid starttime endtime status purpose dbname mtversion)
  (sqlite3:execute nsdb "INSERT INTO processes (host,port,pid,starttime,endtime,status,purpose,dbname,mtversion) VALUES (?,?,?,?,?,?,?,?,?);"
		   host port pid starttime endtime status purpose dbname mtversion))

(define (dbfile:set-process-status nsdb host pid newstatus)
  (sqlite3:execute nsdb "UPDATE processes SET status=? WHERE host=? AND pid=?;" newstatus host pid))

;; as sorted should be stable. can use to choose "winner"
;;
(define (dbfile:get-process-options nsdb purpose dbname)
  (sqlite3:fold-row
   ;; host port pid starttime status mtversion
   (lambda (res . row)
     (cons row res))
   '()
   nsdb
   "SELECT host,port,pid,starttime,endtime,status,mtversion FROM processes WHERE purpose=? AND dbname LIKE ? AND status IN ('running','alive') ORDER BY starttime ASC,host,port;"
   purpose dbname))

(define (dbfile:get-process-info nsdb host pid)
  (let ((res (sqlite3:fold-row
	      ;; host port pid starttime status mtversion
	      (lambda (res . row)
		(cons row res))
	      '()
	      nsdb
	      "SELECT host,port,pid,starttime,endtime,status,purpose,dbname,mtversion FROM processes WHERE host=? AND pid=?;"
	      host pid)))
    (if (null? res)
	#f
	(car res))))

(define (dbfile:row->procinf row)
  (match row
   ((host port pid starttime endtime status mtversion)
    (make-procinf host: host port: port pid: pid starttime: starttime endtime: endtime status: status mtversion: mtversion))
   (else
    (debug:print 0 *default-log-port* "ERROR: row "row" did not match host,port,pid,starttime,endtime,status,mtversion")
    #f)))

(define (dbfile:set-process-done nsdb host pid reason)
  (sqlite3:execute nsdb "UPDATE processes SET status='done',endtime=?,reason=? WHERE host=? AND pid=?;" (current-seconds) reason host pid)
  (dbfile:cleanup-old-entries nsdb))

(define (dbfile:cleanup-old-entries nsdb)
  (sqlite3:execute nsdb "DELETE FROM process WHERE status='done' AND endtime<?;" (- (current-seconds) (* 3600 48))))

;; other no-sync functions

(define (dbfile:with-no-sync-db dbpath proc)
  (mutex-lock! *no-sync-db-mutex*)
  (let* ((already-open *no-sync-db*)
	 (db  (or already-open (dbfile:raw-open-no-sync-db dbpath)))

			(debug:print 0 *default-log-port* "WARNING: received a stop server from client by remote request.")
			#f)
		       ((null? servers) #f) ;; not ok
		       ((equal? (list-ref (car servers) 6) ;; compare the servinfofile
				(tt-servinf-file ttdat))
			(let* ((res (if db-locked-in
					#t
					;;
					;; let's replace the below "winning" lock method with:
					;;  1. create a lock file with pid etc.
					;;  2. if there are no other lock files make an entry in the no-sync db
					;;  3. gather the lock entries, apply the "winner" heuristic
					;;  4. if I'm the winner, set tt-state to 'running else set to 'notthewinner
					;;
					;; New idea:
					;;  1. check all processes entries that match the db
					;;  2. sort by fixed heuristic
					;;  3. if I'm number one, set state to 'running and db-locked-in to #t
					(let* ((candidates (dbfile:with-no-sync-db
							     nosyncdbpath
							     (lambda (nsdb)
							       (dbfile:get-process-options nsdb "server" dbfname))))
					       (primecand  (begin
							     (assert (not (null? candidates))
								     "HOW CAN WE NOT BE IN THE PROCESSES DB AS A SERVER?")
							     (dbfile:row->procinf (car candidates)))))
					  ;; compare primecand with myself
					  ;; if not me check that it is reachable
					  ;;   if reachable exit
					  #f)
					
					#;(let* ((lock-result  ;; this is the primary lock - need to double verify that got it
						(dbfile:with-no-sync-db
						 nosyncdbpath
						 (lambda (db)
						   (db:no-sync-lock-and-check db dbfname
									      (tt-servinf-file ttdat)
									      ;; (dbr:dbstruct-dbtmpname dbstruct)
									      ))))