743 lines
24 KiB
Scheme
743 lines
24 KiB
Scheme
;;; A Unix file port system to completely replace S48 file ports.
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;;; We use S48 extensible ports.
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;;; Copyright (c) 1993 by Olin Shivers.
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(define-record fdport-data
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channel
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revealed)
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(define max-fdport 255)
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; This stuff is _weak_.
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; Vector of weak pointers mapping fd -> fdport.
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(define (weak-vector-set! vector number set-me)
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(vector-set! vector number (make-weak-pointer set-me)))
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(define (weak-vector-ref vector number)
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(let ((ref (vector-ref vector number)))
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(if (weak-pointer? ref) (weak-pointer-ref ref) ref)))
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(define (strengthen-weak-vector-ref vector number)
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(vector-set! vector number (weak-vector-ref vector number)))
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(define (weaken-weak-vector-ref vector number)
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(weak-vector-set! vector number (weak-vector-ref vector number)))
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(define fdports (make-vector max-fdport #f))
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(define (install-fdport fdport)
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(let* ((fdport* (fdport-data fdport))
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(ch (fdport-data:channel fdport*))
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(ch-number (channel-os-index ch)))
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(if (not (= (fdport-data:revealed fdport*) 0))
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(vector-set! fdports ch-number fdport)
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(weak-vector-set! fdports ch-number fdport))))
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(define (maybe-fdes->port fdes)
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(weak-vector-ref fdports fdes))
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;Hmm... these shouldn't be necessary. But still.
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;Fake defrec routines for backwards compatibility.
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(define (fdport-data:fd fdport*)
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(channel-os-index (fdport-data:channel fdport*)))
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(define (fdport-data:closed? fdport*)
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(eq? (channel-status (fdport-data:channel fdport*))
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(enum channel-status-option closed)))
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;;; Support for channel-ready?
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;;; This applies to input- and output-ports
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(define (fdport-channel-ready? fdport)
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(channel-ready? (fdport-data:channel (port-data fdport))))
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;Arbitrary, for now.
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(define buffer-size 255)
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(define open-fdchannel open-channel)
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(define (make-input-fdchannel fd)
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(open-fdchannel fd (enum channel-status-option input)))
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(define (make-output-fdchannel fd)
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(open-fdchannel fd (enum channel-status-option output)))
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;The two following routines are to build ports from stdin and stdout channels.
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(define (channel-port->input-fdport channel-port)
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(let ((p (make-buffered-input-port input-fdport-handler
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(make-fdport-data
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(channel-cell-ref (port-data channel-port)) 1)
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(make-byte-vector buffer-size 0) 0 0)))
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(obtain-port-lock channel-port)
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(set-port-lock! p (port-lock channel-port))
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(set-port-locked?! p (port-locked? channel-port))
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(install-fdport p)
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(release-port-lock channel-port)
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p))
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(define (channel-port->output-fdport channel-port)
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(let ((p (make-buffered-output-port
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output-fdport-handler
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(make-fdport-data (channel-cell-ref(port-data channel-port)) 1)
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(make-byte-vector buffer-size 0) 0 buffer-size)))
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(obtain-port-lock channel-port)
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(set-port-lock! p (port-lock channel-port))
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(set-port-locked?! p (port-locked? channel-port))
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(install-fdport p)
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(periodically-force-output! p)
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(release-port-lock channel-port)
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p))
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(define (channel-port->unbuffered-output-fdport channel-port)
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(let ((p (make-unbuffered-output-port unbuffered-output-fdport-handler
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(make-fdport-data
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(channel-cell-ref (port-data channel-port)) 1))))
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(obtain-port-lock channel-port)
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(set-port-lock! p (port-lock channel-port))
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(set-port-locked?! p (port-locked? channel-port))
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(install-fdport p)
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(periodically-force-output! p)
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(release-port-lock channel-port)
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p))
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(define (alloc-input-fdport fd revealed)
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(make-buffered-input-port input-fdport-handler
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(make-fdport-data (make-input-fdchannel fd) revealed)
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(make-byte-vector buffer-size 0) 0 0))
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(define (alloc-output-fdport fd revealed)
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(make-buffered-output-port output-fdport-handler
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(make-fdport-data (make-output-fdchannel fd) revealed)
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(make-byte-vector buffer-size 0) 0 buffer-size))
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(define (make-input-fdport fd revealed)
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(let ((p (alloc-input-fdport fd revealed)))
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(install-fdport p)
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p))
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(define (make-output-fdport fd revealed)
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(let ((p (alloc-output-fdport fd revealed)))
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(periodically-force-output! p)
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(install-fdport p)
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p))
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(define (fdport? x)
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(cond ((or (and (input-port? x) (port-data x))
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(and (output-port? x) (port-data x)))
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=> (lambda (d) (fdport-data? d)))
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(else #f)))
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(define fdport-null-method (lambda (x) x #f))
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(define null-func (lambda args #t))
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(define (close-fdport* fdport*)
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(vector-set! fdports (channel-os-index (fdport-data:channel fdport*)) #f)
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(close-channel (fdport-data:channel fdport*)))
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;The handlers drop straight through to the convenient channel routines.
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(define (make-input-fdport-handler bufferproc)
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(make-buffered-input-port-handler
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(lambda (fdport*)
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(list 'input-fdport (fdport-data:channel fdport*)))
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close-fdport*
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bufferproc
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fdport-channel-ready?
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(lambda (fdport* owner)
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(steal-channel! (fdport-data:channel fdport*) owner))))
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(define input-fdport-handler
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(make-input-fdport-handler
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(lambda (fdport* buffer start needed)
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(channel-read buffer start needed (fdport-data:channel fdport*)))))
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(define (make-output-fdport-handler bufferproc)
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(make-buffered-output-port-handler
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(lambda (fdport*)
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(list 'output-fdport (fdport-data:channel fdport*)))
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close-fdport*
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bufferproc
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fdport-channel-ready?
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(lambda (fdport* owner)
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(steal-channel! (fdport-data:channel fdport*) owner))))
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(define output-fdport-handler
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(make-output-fdport-handler
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(lambda (fdport* buffer start count)
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(channel-write buffer start count (fdport-data:channel fdport*)))))
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(define unbuffered-output-fdport-handler
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(let ((buffer (make-byte-vector 1 0)))
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(make-output-fdport-handler
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(lambda (fdport* char)
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(byte-vector-set! buffer 0 (char->ascii char))
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(channel-write buffer 0 1 (fdport-data:channel fdport*))))))
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(define fdport-data port-data)
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; That was easy.
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(define (guess-output-policy port)
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(if (= 0 (port-limit port))
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bufpol/none
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bufpol/block))
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(define (set-port-buffering port policy . maybe-size)
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(cond ((and (fdport? port) (open-input-port? port))
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(let ((size (if (pair? maybe-size) (car maybe-size) 255)))
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(set-input-port-buffering port policy size)))
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((and (fdport? port) (open-output-port? port))
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(let ((size (if (pair? maybe-size) (car maybe-size) 255)))
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(if (<= size 0) (error "size must be at least 1"))
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(set-output-port-buffering port policy size)))
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(else
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(warn "port-type not supported" port))))
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(define (set-output-port-buffering port policy size)
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(cond ((eq? policy bufpol/none)
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(install-nullbuffer port unbuffered-output-fdport-handler))
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((eq? policy bufpol/block)
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(let ((old-size (byte-vector-length (port-buffer port)))
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(new-buffer (make-byte-vector size 0)))
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(if (< size old-size)
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(begin
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(really-force-output port)
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(obtain-port-lock port)
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(set-port-index! port 0))
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(begin
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(obtain-port-lock port)
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(copy-bytes! (port-buffer port) 0 new-buffer 0 old-size)))
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(install-buffer port new-buffer size)
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(release-port-lock port)))
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((eq? policy bufpol/line)
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(install-nullbuffer port (make-line-output-proc size)))
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(else (warn "policy not supported " policy))))
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(define (install-nullbuffer port handler)
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(really-force-output port)
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(obtain-port-lock port)
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(set-port-limit! port 0)
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(set-port-index! port 0)
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(set-port-buffer! port (make-byte-vector 0 0))
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(set-port-handler! port handler)
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(release-port-lock port))
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(define (install-buffer port new-buffer size)
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(if (eq? bufpol/none (guess-output-policy port))
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(set-port-handler! port output-fdport-handler))
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(set-port-limit! port size)
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(set-port-buffer! port new-buffer))
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; TODO flush on stdinput is required but probably impossible since current-input-port is a fluid and may change without notice. One possibility would be to override (current-input-port)
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;;; This port can ONLY be flushed with a newline or a close-output
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;;; flush-output won't help
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(define (make-line-output-proc size)
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(let ((proc-buffer (make-byte-vector size 0))
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(proc-buffer-index 0))
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(make-buffered-output-port-handler
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(lambda (fdport*)
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(list 'output-fdport (fdport-data:channel fdport*)))
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(lambda (fdport*)
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(channel-write proc-buffer
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0
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proc-buffer-index
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(fdport-data:channel fdport*))
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(close-fdport* fdport*))
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(lambda (fdport* char)
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(byte-vector-set! proc-buffer proc-buffer-index (char->ascii char))
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(set! proc-buffer-index (+ proc-buffer-index 1))
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(cond ((or (eq? char #\newline) (= proc-buffer-index size))
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(channel-write proc-buffer
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0
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proc-buffer-index
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(fdport-data:channel fdport*))
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(set! proc-buffer-index 0))))
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fdport-channel-ready?
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(lambda (fdport* owner)
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(steal-channel! (fdport-data:channel fdport*) owner)))))
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(define (set-input-port-buffering port policy size)
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(cond ((eq? policy bufpol/none)
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(set-input-port-buffering port bufpol/block 1))
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((eq? policy bufpol/block)
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(if (<= size 0) (error "size must be at least 1"))
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(install-input-handler port input-fdport-handler size #t))
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((eq? policy bufpol/line)
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(error "bufpol/line not allowed on input"))
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(else (warn "policy not supported " policy))))
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(define (install-input-handler port new-handler size gentle?)
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(obtain-port-lock port)
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(let* ((old-limit (port-limit port))
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(old-index (port-index port))
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(old-buffer (port-buffer port))
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(old-unread (- old-limit old-index))
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(new-unread (min old-unread size))
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(throw-away (max 0 (- old-unread new-unread)))
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(new-buffer (make-byte-vector size 0)))
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(if (not gentle?)
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(let ((ret (if (> throw-away 0)
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(let ((return-buffer
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(make-byte-vector throw-away 0)))
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(copy-bytes! old-buffer old-index
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return-buffer 0
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throw-away) return-buffer)
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#f)))
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(copy-bytes! old-buffer (+ old-index throw-away)
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new-buffer 0
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new-unread)
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(set-port-buffer! port new-buffer)
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(set-port-index! port 0)
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(set-port-limit! port new-unread)
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(set-port-handler! port new-handler)
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(release-port-lock port)
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ret)
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(begin
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(install-drain-port-handler
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old-buffer old-index old-limit port new-handler)
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(set-port-buffer! port new-buffer)
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(set-port-index! port 0)
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(set-port-limit! port 0)
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(release-port-lock port)
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#t))))
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(define (install-drain-port-handler
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old-buffer old-start old-limit port new-handler)
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(if (< 0 (- old-limit old-start))
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(set-port-handler! port
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(make-drain-port-handler
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old-buffer old-start old-limit port new-handler))
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(set-port-handler! port new-handler)))
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;;; TODO: This reference to port will prevent gc !!!
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(define (make-drain-port-handler
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very-old-buffer old-start old-limit port new-handler)
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(let ((old-buffer (make-byte-vector old-limit 0)))
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(copy-bytes! very-old-buffer 0 old-buffer 0 old-limit)
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(make-input-fdport-handler
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(lambda (data buffer start needed)
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(let ((old-left (- (byte-vector-length old-buffer) old-start)))
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(let ((size (cond ((or (eq? needed 'any) (eq? needed 'immediate))
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(min old-left
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(byte-vector-length buffer)))
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(else (min needed old-left)))))
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(copy-bytes! old-buffer old-start buffer start size)
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(set! old-start (+ size old-start))
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(if (= old-start (byte-vector-length old-buffer)) ;buffer drained ?
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(begin
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(set-port-handler! port new-handler)
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(if (and (integer? needed) (> needed size))
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(+ size ((port-handler-buffer-proc new-handler)
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data buffer (+ start size) (- needed size)))
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size))
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size)))))))
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;;; Open & Close
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;;; ------------
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;;; replace rts/channel-port.scm begin
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(define (open-file fname flags . maybe-mode)
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(with-cwd-aligned
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(let ((fd (apply open-fdes fname flags maybe-mode))
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(access (bitwise-and flags open/access-mask)))
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((if (or (= access open/read) (= access open/read+write))
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make-input-fdport
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make-output-fdport)
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fd 0))))
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(define (open-input-file fname . maybe-flags)
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(let ((flags (:optional maybe-flags 0)))
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(open-file fname (deposit-bit-field flags open/access-mask open/read))))
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(define (open-output-file fname . rest)
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(let* ((flags (if (pair? rest) (car rest)
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(bitwise-ior open/create open/truncate))) ; default
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(maybe-mode (if (null? rest) '() (cdr rest)))
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(flags (deposit-bit-field flags open/access-mask open/write)))
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(apply open-file fname flags maybe-mode)))
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;;; replace rts/channel-port.scm end
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;;; All these revealed-count-hacking procs have atomicity problems.
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;;; They need to run uninterrupted.
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;;; (port-locks should do the trick -df)
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;;; (what else has atomicity problems? -df)
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(define (increment-revealed-count port delta)
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(obtain-port-lock port)
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(let* ((data (fdport-data port))
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(count (fdport-data:revealed data))
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(newcount (+ count delta)))
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(set-fdport-data:revealed data newcount)
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(if (and (zero? count) (> newcount 0)) ; We just became revealed,
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(begin
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(strengthen-weak-vector-ref fdports (fdport-data:fd data))
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(%set-cloexec (fdport-data:fd data) #f)))); so don't close on exec().
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(release-port-lock port))
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(define (release-port-handle port)
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(check-arg fdport? port port->fdes)
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(obtain-port-lock port)
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(let* ((data (fdport-data port))
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(rev (fdport-data:revealed data)))
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(if (not (zero? rev))
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; (set-fdport-data:old-revealed data
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; (- (fdport-data:old-revealed data) 1))
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(let ((new-rev (- rev 1)))
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(set-fdport-data:revealed data new-rev)
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(if (zero? new-rev) ; We just became unrevealed, so
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(begin ; the fd can be closed on exec.
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(weaken-weak-vector-ref fdports (fdport-data:fd data))
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(%set-cloexec (fdport-data:fd data) #t))))))
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(release-port-lock port))
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(define (port-revealed port)
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(let ((count (fdport-data:revealed
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(fdport-data
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(check-arg fdport? port port-revealed)))))
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(and (not (zero? count)) count)))
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(define (fdes->port fd port-maker) ; local proc.
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(cond ((maybe-fdes->port fd) =>
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(lambda (p)
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(increment-revealed-count p 1)
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p))
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(else (port-maker fd 1))))
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(define (fdes->inport fd) (fdes->port fd make-input-fdport))
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(define (fdes->outport fd) (fdes->port fd make-output-fdport))
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(define (port->fdes port)
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(check-arg open-fdport? port port->fdes)
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(let ((data (fdport-data port)))
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(increment-revealed-count port 1)
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(fdport-data:fd data)))
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(define (call/fdes fd/port proc)
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(cond ((integer? fd/port)
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(proc fd/port))
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((fdport? fd/port)
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(let ((port fd/port))
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(dynamic-wind
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(lambda ()
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(if (not port) (error "Can't throw back into call/fdes.")))
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(lambda () (proc (port->fdes port)))
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(lambda ()
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(release-port-handle port)
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(set! port #f)))))
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(else (error "Not a file descriptor or fdport." fd/port))))
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;;; Don't mess with the revealed count in the port case
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;;; -- just sneakily grab the fdes and run.
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(define (sleazy-call/fdes fd/port proc)
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(proc (cond ((integer? fd/port) fd/port)
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((fdport? fd/port) (fdport-data:fd (fdport-data fd/port)))
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(else (error "Not a file descriptor or fdport." fd/port)))))
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;;; Random predicates and arg checkers
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;;; ----------------------------------
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(define (open-fdport-data? x)
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(and (fdport-data? x)
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(not (fdport-data:closed? x))))
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(define (open-fdport? x)
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(and (fdport? x) (or (open-output-port? x) (open-input-port? x))))
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(define (fdport-open? port)
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(check-arg fdport? port fdport-open?)
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(not (fdport-data:closed? (port-data port))))
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;;; Initialise the system
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;;; ---------------------
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;;; JMG: should be deprecated-proc
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(define error-output-port
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current-error-port)
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(define old-inport #f) ; Just because.
|
|
(define old-outport #f)
|
|
(define old-errport #f)
|
|
|
|
(define (init-fdports!)
|
|
(if (not (fdport? (current-input-port)))
|
|
(set! old-inport (current-input-port)))
|
|
(if (not (fdport? (current-output-port)))
|
|
(set! old-outport (current-output-port)))
|
|
(if (not (fdport? (current-error-port)))
|
|
(set! old-errport (current-error-port)))
|
|
(set-fluid! $current-input-port
|
|
(channel-port->input-fdport (current-input-port)))
|
|
(set-fluid! $current-output-port
|
|
(channel-port->output-fdport (current-output-port)))
|
|
|
|
(set-fluid! $current-error-port
|
|
(channel-port->unbuffered-output-fdport (current-error-port)))
|
|
(set-fluid! $current-noise-port (make-null-output-port)))
|
|
|
|
;;; Generic port operations
|
|
;;; -----------------------
|
|
|
|
;;; (close-after port f)
|
|
;;; Apply F to PORT. When F returns, close PORT, then return F's result.
|
|
;;; Does nothing special if you throw out or throw in.
|
|
|
|
(define (close-after port f)
|
|
(receive vals (f port)
|
|
(close port)
|
|
(apply values vals)))
|
|
|
|
(define (close port/fd)
|
|
((cond ((integer? port/fd) close-fdes)
|
|
((output-port? port/fd) close-output-port)
|
|
((input-port? port/fd) close-input-port)
|
|
(else (error "Not file-descriptor or port" port/fd))) port/fd))
|
|
|
|
;;; If this fd has an associated input or output port,
|
|
;;; move it to a new fd, freeing this one up.
|
|
|
|
(define (evict-ports fd)
|
|
(cond ((maybe-fdes->port fd) => ; Shouldn't bump the revealed count.
|
|
(lambda (port)
|
|
(%move-fdport (%dup fd) port 0)))))
|
|
|
|
(define (%move-fdport fd port new-revealed)
|
|
(obtain-port-lock port)
|
|
(let* ((fdport* (fdport-data port))
|
|
(ch (fdport-data:channel fdport*))
|
|
(old-fd (channel-os-index ch))
|
|
(old-vector-ref (vector-ref fdports old-fd)))
|
|
(set-fdport-data:revealed fdport* new-revealed)
|
|
(vector-set! fdports old-fd #f)
|
|
(close-channel ch)
|
|
(set-fdport-data:channel
|
|
fdport*
|
|
(make-fd-channel port fd))
|
|
(vector-set! fdports fd old-vector-ref)
|
|
(%set-cloexec fd (not new-revealed)))
|
|
(release-port-lock port)
|
|
#f) ; JMG: It used to return #f on succes in 0.5.1, so we do the same
|
|
|
|
(define (make-fd-channel port fd)
|
|
((if (input-port? port) make-input-fdchannel make-output-fdchannel) fd))
|
|
|
|
(define (close-fdes fd)
|
|
(evict-ports fd)
|
|
(%close-fdes fd))
|
|
|
|
(define (flush-fdport fdport)
|
|
(check-arg fdport? fdport flush-fdport)
|
|
(force-output fdport))
|
|
|
|
(define (flush-all-ports)
|
|
(let loop ((i 0))
|
|
(if (< i max-fdport)
|
|
(begin
|
|
(let ((fdport (weak-vector-ref fdports i)))
|
|
(if (and fdport (output-port? fdport) ) (flush-fdport fdport)))
|
|
(loop (+ i 1))))))
|
|
|
|
;;; Extend R4RS i/o ops to handle file descriptors.
|
|
;;; -----------------------------------------------
|
|
|
|
(define s48-char-ready? (structure-ref scheme char-ready?))
|
|
(define s48-read-char (structure-ref scheme read-char))
|
|
|
|
(define-simple-syntax
|
|
(define-r4rs-input (name arg ...) stream s48name body ...)
|
|
(define (name arg ... . maybe-i/o)
|
|
(let ((stream (:optional maybe-i/o (current-input-port))))
|
|
(cond ((input-port? stream) (s48name arg ... stream))
|
|
((integer? stream) body ...)
|
|
(else (error "Not a port or file descriptor" stream))))))
|
|
|
|
(define-r4rs-input (char-ready?) input s48-char-ready?
|
|
(%char-ready-fdes? input))
|
|
|
|
(define-r4rs-input (read-char) input s48-read-char
|
|
(read-fdes-char input))
|
|
|
|
;structure refs changed to get reference from scheme -dalbertz
|
|
(define s48-display (structure-ref scheme display))
|
|
(define s48-newline (structure-ref scheme newline))
|
|
(define s48-write (structure-ref scheme write))
|
|
(define s48-write-char (structure-ref scheme write-char))
|
|
(define s48-format (structure-ref formats format))
|
|
(define s48-force-output (structure-ref i/o force-output))
|
|
|
|
(define-simple-syntax
|
|
(define-r4rs-output (name arg ...) stream s48name body ...)
|
|
(define (name arg ... . maybe-i/o)
|
|
(let ((stream (:optional maybe-i/o (current-output-port))))
|
|
(cond ((output-port? stream) (s48name arg ... stream))
|
|
((integer? stream) body ...)
|
|
(else (error "Not a port or file descriptor" stream))))))
|
|
|
|
;;; This one depends upon S48's string ports.
|
|
(define-r4rs-output (display object) output s48-display
|
|
(let ((sp (make-string-output-port)))
|
|
(display object sp)
|
|
(write-string (string-output-port-output sp) output)))
|
|
|
|
(define-r4rs-output (newline) output s48-newline
|
|
(write-fdes-char #\newline output))
|
|
|
|
(define-r4rs-output (write object) output s48-write
|
|
(let ((sp (make-string-output-port)))
|
|
(write object sp)
|
|
(write-string (string-output-port-output sp) output)))
|
|
|
|
(define-r4rs-output (write-char char) output s48-write-char
|
|
(write-fdes-char char output))
|
|
|
|
;;; S48's force-output doesn't default to forcing (current-output-port).
|
|
(define-r4rs-output (force-output) output s48-force-output
|
|
(values)) ; Do nothing if applied to a file descriptor.
|
|
|
|
|
|
(define (format dest cstring . args)
|
|
(if (integer? dest)
|
|
(write-string (apply s48-format #f cstring args) dest)
|
|
(apply s48-format dest cstring args)))
|
|
|
|
;;; with-current-foo-port procs
|
|
;;; ---------------------------
|
|
|
|
(define (with-current-input-port* port thunk)
|
|
(let-fluid $current-input-port port thunk))
|
|
|
|
(define (with-current-output-port* port thunk)
|
|
(let-fluid $current-output-port port thunk))
|
|
|
|
(define (with-current-error-port* port thunk)
|
|
(let-fluid $current-error-port port thunk))
|
|
|
|
(define-simple-syntax (with-current-input-port port body ...)
|
|
(with-current-input-port* port (lambda () body ...)))
|
|
|
|
(define-simple-syntax (with-current-output-port port body ...)
|
|
(with-current-output-port* port (lambda () body ...)))
|
|
|
|
(define-simple-syntax (with-current-error-port port body ...)
|
|
(with-current-error-port* port (lambda () body ...)))
|
|
|
|
|
|
;;; set-foo-port! procs
|
|
;;; -------------------
|
|
;;; Side-effecting variants of with-current-input-port* and friends.
|
|
|
|
(define (set-current-input-port! port) (set-fluid! $current-input-port port))
|
|
(define (set-current-output-port! port) (set-fluid! $current-output-port port))
|
|
(define (set-current-error-port! port) (set-fluid! $current-error-port port))
|
|
|
|
|
|
;;; call-with-foo-file with-foo-to-file
|
|
;;; -----------------------------------
|
|
|
|
;;; Copied straight from rts/port.scm, but re-defined in this module,
|
|
;;; closed over my versions of open-input-file and open-output-file.
|
|
|
|
(define (call-with-mumble-file open close)
|
|
(lambda (string proc)
|
|
(with-cwd-aligned
|
|
(let ((port #f))
|
|
(dynamic-wind (lambda ()
|
|
(if port
|
|
(warn "throwing back into a call-with-...put-file"
|
|
string)
|
|
(set! port (open string))))
|
|
(lambda () (proc port))
|
|
(lambda ()
|
|
(if port
|
|
(close port))))))))
|
|
|
|
;;; replace rts/channel-port.scm begin
|
|
(define call-with-input-file
|
|
(call-with-mumble-file open-input-file close-input-port))
|
|
|
|
(define call-with-output-file
|
|
(call-with-mumble-file open-output-file close-output-port))
|
|
|
|
(define (with-input-from-file string thunk)
|
|
(call-with-input-file string
|
|
(lambda (port)
|
|
(let-fluid $current-input-port port thunk))))
|
|
|
|
(define (with-output-to-file string thunk)
|
|
(call-with-output-file string
|
|
(lambda (port)
|
|
(let-fluid $current-output-port port thunk))))
|
|
|
|
;;; replace rts/channel-port.scm end
|
|
|
|
|
|
|
|
(define (nselect rvec wvec evec timeout)
|
|
(let ((rlist (vector->list rvec))
|
|
(wlist (vector->list wvec)))
|
|
(let ((imm-r (filter char-ready? rlist))
|
|
(imm-w (filter output-port-ready? wlist)))
|
|
(if (and (null? imm-r)
|
|
(null? imm-w))
|
|
(select-threaded rlist wlist timeout)
|
|
(values (list->vector imm-r)
|
|
(list->vector imm-w)
|
|
'#())))))
|
|
|
|
(define (timeout-thread result-lock timeout)
|
|
(lambda ()
|
|
((structure-ref threads sleep) timeout)
|
|
(release-lock result-lock)))
|
|
|
|
(define (select-threaded rlist wlist timeout)
|
|
(let ((result-lock (make-lock))
|
|
(ready-lock (make-lock))
|
|
(read-ready (cons 'cell '()))
|
|
(write-ready (cons 'cell '()))
|
|
(are-we-ready? #f))
|
|
(let* ((port-waiter
|
|
(lambda (ready? ready-list)
|
|
(lambda (port)
|
|
(lambda ()
|
|
; ((structure-ref interrupts disable-interrupts!))
|
|
; (if (ready? port)
|
|
; ((structure-ref interrupts enable-interrupts!))
|
|
; (wait-for-channel ; enables interrupts
|
|
; (fdport-data:channel
|
|
; (fdport-data port))))
|
|
(let lp ()
|
|
(if (ready? port)
|
|
(begin
|
|
(obtain-lock ready-lock)
|
|
(set-cdr! ready-list (cons port (cdr ready-list)))
|
|
(release-lock ready-lock)
|
|
(release-lock result-lock))
|
|
(if (not are-we-ready?)
|
|
(begin ((structure-ref threads sleep) 20)
|
|
(lp)))))))))
|
|
(read-waiter (port-waiter char-ready? read-ready))
|
|
(write-waiter (port-waiter output-port-ready? write-ready)))
|
|
(obtain-lock result-lock)
|
|
(for-each spawn (map read-waiter rlist))
|
|
(for-each spawn (map write-waiter wlist))
|
|
(if timeout (spawn (timeout-thread result-lock timeout)))
|
|
(obtain-lock result-lock)
|
|
(set! are-we-ready? #t)
|
|
; (relinquish-timeslice)
|
|
(values (cdr read-ready)
|
|
(cdr write-ready)
|
|
'#()))))
|
|
|
|
|