X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fserve-event.lisp;h=ca055edf437fb56635fe98eb300452ef9dea1b4d;hb=6753b552e912fae737ef2ee2b9fbc59c265ea941;hp=aa35856c72f895761bdc29f9d488d0ca0a76e1a0;hpb=dbc1b48749cb40ca38391cbf0ff5e1de1accacdc;p=sbcl.git diff --git a/src/code/serve-event.lisp b/src/code/serve-event.lisp index aa35856..ca055ed 100644 --- a/src/code/serve-event.lisp +++ b/src/code/serve-event.lisp @@ -72,6 +72,8 @@ (unless (member direction '(:input :output)) ;; FIXME: should be TYPE-ERROR? (error "Invalid direction ~S, must be either :INPUT or :OUTPUT" direction)) + (unless (<= 0 fd (1- sb!unix:fd-setsize)) + (error "Cannot add an FD handler for ~D: not under FD_SETSIZE limit." fd)) (let ((handler (make-handler direction fd function))) (with-descriptor-handlers (push handler *descriptor-handlers*)) @@ -119,60 +121,95 @@ (sb!unix:unix-fstat (handler-descriptor handler))) (setf (handler-bogus handler) t) (push handler bogus-handlers))) - (restart-case (error "~S ~[have~;has a~:;have~] bad file descriptor~:P." - bogus-handlers (length bogus-handlers)) - (remove-them () - :report "Remove bogus handlers." - (with-descriptor-handlers - (setf *descriptor-handlers* - (delete-if #'handler-bogus *descriptor-handlers*)))) - (retry-them () - :report "Retry bogus handlers." - (dolist (handler bogus-handlers) - (setf (handler-bogus handler) nil))) - (continue () - :report "Go on, leaving handlers marked as bogus."))) + (when bogus-handlers + (restart-case (error "~S ~[have~;has a~:;have~] bad file descriptor~:P." + bogus-handlers (length bogus-handlers)) + (remove-them () + :report "Remove bogus handlers." + (with-descriptor-handlers + (setf *descriptor-handlers* + (delete-if #'handler-bogus *descriptor-handlers*)))) + (retry-them () + :report "Retry bogus handlers." + (dolist (handler bogus-handlers) + (setf (handler-bogus handler) nil))) + (continue () + :report "Go on, leaving handlers marked as bogus.")))) nil) ;;;; SERVE-ALL-EVENTS, SERVE-EVENT, and friends +;;; When a *periodic-polling-function* is defined the server will not +;;; block for more than the maximum event timeout and will call the +;;; polling function if it does time out. +(declaim (type (or null symbol function) *periodic-polling-function*)) +(defvar *periodic-polling-function* nil + "Either NIL, or a designator for a function callable without any +arguments. Called when the system has been waiting for input for +longer then *PERIODIC-POLLING-PERIOD* seconds. Shared between all +threads, unless locally bound. EXPERIMENTAL.") +(declaim (real *periodic-polling-period*)) +(defvar *periodic-polling-period* 0 + "A real number designating the number of seconds to wait for input +at maximum, before calling the *PERIODIC-POLLING-FUNCTION* \(if any.) +Shared between all threads, unless locally bound. EXPERIMENTAL.") + ;;; Wait until FD is usable for DIRECTION. The timeout given to serve-event is ;;; recalculated each time through the loop so that WAIT-UNTIL-FD-USABLE will ;;; timeout at the correct time irrespective of how many events are handled in ;;; the meantime. -(defun wait-until-fd-usable (fd direction &optional timeout) +(defun wait-until-fd-usable (fd direction &optional timeout (serve-events t)) #!+sb-doc "Wait until FD is usable for DIRECTION. DIRECTION should be either :INPUT or :OUTPUT. TIMEOUT, if supplied, is the number of seconds to wait before giving -up." - (prog (usable) +up. Returns true once the FD is usable, NIL return indicates timeout. + +If SERVE-EVENTS is true (the default), events on other FDs are served while +waiting." + (tagbody :restart (multiple-value-bind (to-sec to-usec stop-sec stop-usec signalp) (decode-timeout timeout) (declare (type (or integer null) to-sec to-usec)) - (with-fd-handler (fd direction (lambda (fd) - (declare (ignore fd)) - (setf usable t))) - (loop - (sub-serve-event to-sec to-usec signalp) - (when usable - (return-from wait-until-fd-usable t)) - (when to-sec - (multiple-value-bind (sec usec) - (decode-internal-time (get-internal-real-time)) - (setf to-sec (- stop-sec sec)) - (cond ((> usec stop-usec) - (decf to-sec) - (setf to-usec (- (+ stop-usec 1000000) usec))) - (t - (setf to-usec (- stop-usec usec))))) - (when (or (minusp to-sec) (minusp to-usec)) - (if signalp - (progn - (signal-deadline) - (go :restart)) - (return-from wait-until-fd-usable nil))))))))) + (flet ((maybe-update-timeout () + ;; If we return early, recompute the timeouts, possibly + ;; signaling the deadline or returning with NIL to caller. + (setf (values to-sec to-usec) + (relative-decoded-times stop-sec stop-usec)) + (when (and (zerop to-sec) (not (plusp to-usec))) + (cond (signalp + (signal-deadline) + (go :restart)) + (t + (return-from wait-until-fd-usable nil)))))) + (if (and serve-events + ;; No timeout or non-zero timeout + (or (not to-sec) + (not (= 0 to-sec to-usec))) + ;; Something to do while we wait + (or *descriptor-handlers* *periodic-polling-function*)) + ;; Loop around SUB-SERVE-EVENT till done. + (dx-let ((usable (list nil))) + (dx-flet ((usable! (fd) + (declare (ignore fd)) + (setf (car usable) t))) + (with-fd-handler (fd direction #'usable!) + (loop + (sub-serve-event to-sec to-usec signalp) + (when (car usable) + (return-from wait-until-fd-usable t)) + (when to-sec + (maybe-update-timeout)))))) + ;; If we don't have to serve events, just poll on the single FD instead. + (loop for to-msec = (if (and to-sec to-usec) + (+ (* 1000 to-sec) (truncate to-usec 1000)) + -1) + when (or #!+win32 (eq direction :output) + (sb!unix:unix-simple-poll fd direction to-msec)) + do (return-from wait-until-fd-usable t) + else + do (when to-sec (maybe-update-timeout)))))))) ;;; Wait for up to timeout seconds for an event to happen. Make sure all ;;; pending events are processed before returning. @@ -200,100 +237,91 @@ happens. Server returns T if something happened and NIL otherwise. Timeout (declare (ignore stop-sec stop-usec)) (sub-serve-event to-sec to-usec signalp))) -;;; When a *periodic-polling-function* is defined the server will not -;;; block for more than the maximum event timeout and will call the -;;; polling function if it does time out. -(declaim (type (or null symbol function) *periodic-polling-function*)) -(defvar *periodic-polling-function* nil - "Either NIL, or a designator for a function callable without any -arguments. Called when the system has been waiting for input for -longer then *PERIODIC-POLLING-PERIOD* seconds. Shared between all -threads, unless locally bound. EXPERIMENTAL.") -(declaim (real *periodic-polling-period*)) -(defvar *periodic-polling-period* 0 - "A real number designating the number of seconds to wait for input -at maximum, before calling the *PERIODIC-POLLING-FUNCTION* \(if any.) -Shared between all threads, unless locally bound. EXPERIMENTAL.") - -;;; Takes timeout broken into seconds and microseconds. +;;; Takes timeout broken into seconds and microseconds, NIL timeout means +;;; to wait as long as needed. (defun sub-serve-event (to-sec to-usec deadlinep) - ;; Figure out our peridic polling needs. MORE-SEC/USEC is the amount - ;; of actual waiting left after we poll (assuming we are polling.) - (multiple-value-bind (poll more-sec more-usec) - (when *periodic-polling-function* - (multiple-value-bind (p-sec p-usec) - (decode-internal-time - (seconds-to-internal-time *periodic-polling-period*)) - (when (or (not to-sec) (> to-sec p-sec) - (and (= to-sec p-sec) (> to-usec p-usec))) - (multiple-value-prog1 - (values *periodic-polling-function* - (when to-sec (- to-sec p-sec)) - (when to-sec (- to-usec p-usec))) - (setf to-sec p-sec - to-usec p-sec))))) + (or + (if *periodic-polling-function* + (multiple-value-bind (p-sec p-usec) + (decode-internal-time + (seconds-to-internal-time *periodic-polling-period*)) + (if to-sec + (loop repeat (/ (+ to-sec (/ to-usec 1e6)) + *periodic-polling-period*) + thereis (sub-sub-serve-event p-sec p-usec) + do (funcall *periodic-polling-function*)) + (loop thereis (sub-sub-serve-event p-sec p-usec) + do (funcall *periodic-polling-function*)))) + (sub-sub-serve-event to-sec to-usec)) + (when deadlinep + (signal-deadline)))) - ;; Next, wait for something to happen. - (sb!alien:with-alien ((read-fds (sb!alien:struct sb!unix:fd-set)) - (write-fds (sb!alien:struct sb!unix:fd-set))) - (sb!unix:fd-zero read-fds) - (sb!unix:fd-zero write-fds) - (let ((count 0)) - (declare (type index count)) +;;; Handles the work of the above, except for periodic polling. Returns +;;; true if something of interest happened. +(defun sub-sub-serve-event (to-sec to-usec) + (sb!alien:with-alien ((read-fds (sb!alien:struct sb!unix:fd-set)) + (write-fds (sb!alien:struct sb!unix:fd-set))) + (sb!unix:fd-zero read-fds) + (sb!unix:fd-zero write-fds) + (let ((count 0)) + (declare (type index count)) - ;; Initialize the fd-sets for UNIX-SELECT and return the active - ;; descriptor count. - (map-descriptor-handlers - (lambda (handler) - ;; FIXME: If HANDLER-ACTIVE ever is reinstanted, it needs - ;; to be checked here in addition to HANDLER-BOGUS - (unless (handler-bogus handler) - (let ((fd (handler-descriptor handler))) - (ecase (handler-direction handler) - (:input (sb!unix:fd-set fd read-fds)) - (:output (sb!unix:fd-set fd write-fds))) - (when (> fd count) - (setf count fd)))))) - (incf count) + ;; Initialize the fd-sets for UNIX-SELECT and return the active + ;; descriptor count. + (map-descriptor-handlers + (lambda (handler) + ;; FIXME: If HANDLER-ACTIVE ever is reinstanted, it needs + ;; to be checked here in addition to HANDLER-BOGUS + (unless (handler-bogus handler) + (let ((fd (handler-descriptor handler))) + (ecase (handler-direction handler) + (:input (sb!unix:fd-set fd read-fds)) + (:output (sb!unix:fd-set fd write-fds))) + (when (> fd count) + (setf count fd)))))) + (incf count) - ;; Next, wait for something to happen. - (multiple-value-bind (value err) - (sb!unix:unix-fast-select count - (sb!alien:addr read-fds) - (sb!alien:addr write-fds) - nil to-sec to-usec) - #!+win32 - (declare (ignore err)) - ;; Now see what it was (if anything) - (cond ((not value) - ;; Interrupted or one of the file descriptors is bad. - ;; FIXME: Check for other errnos. Why do we return true - ;; when interrupted? - #!-win32 - (if (eql err sb!unix:eintr) - t - (handler-descriptors-error)) - #!+win32 - (handler-descriptors-error)) - ((plusp value) - ;; Got something. Call file descriptor handlers - ;; according to the readable and writable masks - ;; returned by select. - (dolist (handler - (select-descriptor-handlers - (lambda (handler) - (let ((fd (handler-descriptor handler))) - (ecase (handler-direction handler) - (:input (sb!unix:fd-isset fd read-fds)) - (:output (sb!unix:fd-isset fd write-fds))))))) - (funcall (handler-function handler) - (handler-descriptor handler))) - t) - ((zerop value) - ;; Timeout. - (cond (poll - (funcall poll) - (sub-serve-event more-sec more-usec deadlinep)) - (deadlinep - (signal-deadline)))))))))) + ;; Next, wait for something to happen. + (multiple-value-bind (value err) + (sb!unix:unix-fast-select count + (sb!alien:addr read-fds) + (sb!alien:addr write-fds) + nil to-sec to-usec) + #!+win32 + (declare (ignore err)) + ;; Now see what it was (if anything) + (cond ((not value) + ;; Interrupted or one of the file descriptors is bad. + ;; FIXME: Check for other errnos. Why do we return true + ;; when interrupted? + #!-win32 + (case err + (#.sb!unix:ebadf + (handler-descriptors-error)) + ((#.sb!unix:eintr #.sb!unix:eagain) + t) + (otherwise + (with-simple-restart (continue "Ignore failure and continue.") + (simple-perror "Unix system call select() failed" + :errno err)))) + #!+win32 + (handler-descriptors-error)) + ((plusp value) + ;; Got something. Call file descriptor handlers + ;; according to the readable and writable masks + ;; returned by select. + (dolist (handler + (select-descriptor-handlers + (lambda (handler) + (let ((fd (handler-descriptor handler))) + (ecase (handler-direction handler) + (:input (sb!unix:fd-isset fd read-fds)) + (:output (sb!unix:fd-isset fd write-fds))))))) + (with-simple-restart (remove-fd-handler "Remove ~S" handler) + (funcall (handler-function handler) + (handler-descriptor handler)) + (go :next)) + (remove-fd-handler handler) + :next) + t))))))