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check existence of sessions in some locking areas

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interp 2003-03-10 13:10:29 +00:00
parent 64371c9941
commit 87a4165f94
1 changed files with 25 additions and 19 deletions
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44
scheme/httpd/surflets/surflet-handler.scm
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@ -316,9 +316,11 @@
;; surveillance of killing new session that has the same number by ;; surveillance of killing new session that has the same number by
;; accident) ;; accident)
(let ((session (table-ref *session-table* session-id))) (let ((session (table-ref *session-table* session-id)))
(memo-killed! (session-memo session))) (if session
;; why can't table entries be deleted correctly? (begin
(table-set! *session-table* session-id #f) (memo-killed! (session-memo session))
(table-set! *session-table* session-id #f))))
;; else: somebody was faster than we
(release-lock *session-table-lock*)) (release-lock *session-table-lock*))
;;; SESSION-ADJUST-TIMEOUT! ;;; SESSION-ADJUST-TIMEOUT!
@ -330,17 +332,21 @@
(define (really-session-adjust-timeout! session-id time-to-live) (define (really-session-adjust-timeout! session-id time-to-live)
(obtain-lock *session-table-lock*) (obtain-lock *session-table-lock*)
(let* ((session (table-ref *session-table* session-id)) (let ((session (table-ref *session-table* session-id))
(memo (session-memo session)) (new-memo (make-default-memo)))
(new-memo (make-default-memo))) (if session
;; Do it this way: new values and then new message (let ((memo (session-memo session)))
(set-memo:value memo ;; Do it this way: new values and then new message
(+ (time) time-to-live)) (set-memo:value memo
(set-memo:new-memo memo new-memo) (+ (time) time-to-live))
;; I don't think we need locking here. Do you agree? (set-memo:new-memo memo new-memo)
(set-session-memo! session new-memo) ;; I don't think we need locking here. Do you agree?
(set-memo:message memo 'adjust-timeout)) (set-session-memo! session new-memo)
(release-lock *session-table-lock*)) (set-memo:message memo 'adjust-timeout)
(release-lock *session-table-lock*))
(begin
(release-lock *session-table-lock*)
(error "There is no session with this ID" session-id)))))
;;; ADJUST-TIMEOUT! ;;; ADJUST-TIMEOUT!
;; Resets time-to-die of current session. The argument must be ;; Resets time-to-die of current session. The argument must be
@ -522,13 +528,13 @@
;;; RESET-SURFLET-CACHE! ;;; RESET-SURFLET-CACHE!
;; Clears *SURFLET-TABLE* (locking). ;; Clears *SURFLET-TABLE* (locking).
(define (reset-surflet-cache!) (define (reset-surflet-cache!)
(with-fatal-handler ; (with-fatal-handler
(lambda (condition decline) ; (lambda (condition decline)
(release-lock *surflet-table-lock*) ; (release-lock *surflet-table-lock*)
(decline)) ; (decline))
(obtain-lock *surflet-table-lock*) (obtain-lock *surflet-table-lock*)
(set! *surflet-table* (make-string-table)) (set! *surflet-table* (make-string-table))
(release-lock *surflet-table-lock*))) (release-lock *surflet-table-lock*))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; INSTANCE ;;; INSTANCE