112 lines
3.6 KiB
Scheme
112 lines
3.6 KiB
Scheme
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(define-enumeration low-interrupt
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(i/o-completion
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post-gc
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keyboard
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alarm
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chld
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cont
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hup
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quit
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term
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tstp
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usr1
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usr2
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info
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io
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poll
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prof
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pwr
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urg
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vtalrm
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winch
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xcpu
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xfsz
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))
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;;; TODO: don't make this a thunk
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(define (number-of-interrupts)
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low-interrupt-count)
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(define low-interrupt-handlers-vector
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(make-vector (number-of-interrupts) '()))
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(define (low-interrupt-handler-ref interrupt)
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(if (or (< interrupt 0) (>= interrupt (number-of-interrupts)))
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(error "ill signum in low-interrupt-handler-ref" interrupt)
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(vector-ref low-interrupt-handlers-vector interrupt)))
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(define (set-low-interrupt-handler! int handler)
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(if (or (< int 0) (>= int (number-of-interrupts)))
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(error "ill signum in set-low-interrupt-handler!" int)
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(vector-set! low-interrupt-handlers-vector int handler)))
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;;; register a handler for interrupt
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;;; the handler is called whenever interrupt occurs among all others,
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;;; which registered for this interrupt
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;;; return value is a function which allows to change the handler
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(define (low-interrupt-register interrupt handler)
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(let* ((old (low-interrupt-handler-ref interrupt))
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(the-lock (make-lock))
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(new-cell (cons handler the-lock)))
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(set-low-interrupt-handler! interrupt (cons new-cell old))
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(lambda (new-handler)
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(obtain-lock the-lock)
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(set-car! new-cell new-handler)
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(release-lock the-lock))))
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(define (init-low-interrupt)
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(set-interrupt-handler!
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(enum interrupt os-signal)
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(lambda (type arg enabled-interrupts)
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(for-each (lambda (handler-none-pair)
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((car handler-none-pair) enabled-interrupts))
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(low-interrupt-handler-ref type))))
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; (set-interrupt-handler!
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; (enum interrupt keyboard)
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; (lambda args
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; (let ((enabled-interrupts "JMG: enabled interrupts not yet impl"))
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; (for-each (lambda (handler-none-pair)
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; ((car handler-none-pair) enabled-interrupts))
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; (low-interrupt-handler-ref (enum low-interrupt keyboard))))))
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(call-after-gc!
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(lambda ()
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(let ((enabled-interrupts "JMG: enabled interrupts not yet impl"))
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(for-each (lambda (handler-lock-pair)
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((car handler-lock-pair) enabled-interrupts))
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(low-interrupt-handler-ref (enum low-interrupt post-gc))))))
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(display "sighandler installed")
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#t)
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(define interrupt/alarm (enum low-interrupt alarm))
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(define interrupt/keyboard (enum low-interrupt keyboard))
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;(define interrupt/memory-shortage (enum low-interrupt memory-shortage))
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(define interrupt/post-gc (enum low-interrupt post-gc))
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(define interrupt/i/o-completion (enum low-interrupt i/o-completion))
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(define interrupt/chld (enum low-interrupt chld))
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(define interrupt/cont (enum low-interrupt cont))
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(define interrupt/hup (enum low-interrupt hup))
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(define interrupt/quit (enum low-interrupt quit))
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(define interrupt/term (enum low-interrupt term))
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(define interrupt/tstp (enum low-interrupt tstp))
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(define interrupt/usr1 (enum low-interrupt usr1))
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(define interrupt/usr2 (enum low-interrupt usr2))
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(define interrupt/info (enum low-interrupt info))
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(define interrupt/io (enum low-interrupt io))
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(define interrupt/poll (enum low-interrupt poll))
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(define interrupt/prof (enum low-interrupt prof))
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(define interrupt/pwr (enum low-interrupt pwr))
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(define interrupt/urg (enum low-interrupt urg))
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(define interrupt/vtalrm (enum low-interrupt vtalrm))
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(define interrupt/winch (enum low-interrupt winch))
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(define interrupt/xcpu (enum low-interrupt xcpu))
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(define interrupt/xfsz (enum low-interrupt xfsz))
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(define interrupt/int interrupt/keyboard)
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(define interrupt/alrm interrupt/alarm)
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