150 lines
4.1 KiB
Factor
150 lines
4.1 KiB
Factor
! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: alien.c-types kernel math math.bitwise namespaces
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locals accessors combinators threads vectors hashtables
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sequences assocs continuations sets
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unix unix.time unix.kqueue unix.process
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io.ports io.unix.backend io.launcher io.unix.launcher
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io.monitors ;
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IN: io.unix.kqueue
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TUPLE: kqueue-mx < mx events monitors ;
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: max-events ( -- n )
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#! We read up to 256 events at a time. This is an arbitrary
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#! constant...
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256 ; inline
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: <kqueue-mx> ( -- mx )
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kqueue-mx new-mx
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H{ } clone >>monitors
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kqueue dup io-error >>fd
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max-events "kevent" <c-array> >>events ;
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GENERIC: io-task-filter ( task -- n )
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M: input-task io-task-filter drop EVFILT_READ ;
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M: output-task io-task-filter drop EVFILT_WRITE ;
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GENERIC: io-task-fflags ( task -- n )
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M: io-task io-task-fflags drop 0 ;
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: make-kevent ( task flags -- event )
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"kevent" <c-object>
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tuck set-kevent-flags
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over io-task-fd over set-kevent-ident
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over io-task-fflags over set-kevent-fflags
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swap io-task-filter over set-kevent-filter ;
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: register-kevent ( kevent mx -- )
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fd>> swap 1 f 0 f kevent
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0 < [ err_no ESRCH = [ (io-error) ] unless ] when ;
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M: kqueue-mx register-io-task ( task mx -- )
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[ >r EV_ADD make-kevent r> register-kevent ]
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[ call-next-method ]
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2bi ;
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M: kqueue-mx unregister-io-task ( task mx -- )
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[ call-next-method ]
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[ >r EV_DELETE make-kevent r> register-kevent ]
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2bi ;
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: wait-kevent ( mx timespec -- n )
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>r [ fd>> f 0 ] keep events>> max-events r> kevent
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dup multiplexer-error ;
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:: kevent-read-task ( mx fd kevent -- )
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mx fd mx reads>> at perform-io-task ;
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:: kevent-write-task ( mx fd kevent -- )
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mx fd mx writes>> at perform-io-task ;
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:: kevent-proc-task ( mx pid kevent -- )
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pid wait-for-pid
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pid find-process
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dup [ swap notify-exit ] [ 2drop ] if ;
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: parse-action ( mask -- changed )
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[
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NOTE_DELETE +remove-file+ ?flag
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NOTE_WRITE +modify-file+ ?flag
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NOTE_EXTEND +modify-file+ ?flag
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NOTE_ATTRIB +modify-file+ ?flag
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NOTE_RENAME +rename-file+ ?flag
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NOTE_REVOKE +remove-file+ ?flag
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drop
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] { } make prune ;
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:: kevent-vnode-task ( mx kevent fd -- )
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""
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kevent kevent-fflags parse-action
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fd mx monitors>> at queue-change ;
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: handle-kevent ( mx kevent -- )
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[ ] [ kevent-ident ] [ kevent-filter ] tri {
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{ [ dup EVFILT_READ = ] [ drop kevent-read-task ] }
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{ [ dup EVFILT_WRITE = ] [ drop kevent-write-task ] }
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{ [ dup EVFILT_PROC = ] [ drop kevent-proc-task ] }
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{ [ dup EVFILT_VNODE = ] [ drop kevent-vnode-task ] }
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} cond ;
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: handle-kevents ( mx n -- )
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[ over events>> kevent-nth handle-kevent ] with each ;
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M: kqueue-mx wait-for-events ( ms mx -- )
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swap dup [ make-timespec ] when
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dupd wait-kevent handle-kevents ;
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! Procs
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: make-proc-kevent ( pid -- kevent )
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"kevent" <c-object>
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tuck set-kevent-ident
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EV_ADD over set-kevent-flags
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EVFILT_PROC over set-kevent-filter
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NOTE_EXIT over set-kevent-fflags ;
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: register-pid-task ( pid mx -- )
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swap make-proc-kevent swap register-kevent ;
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! VNodes
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TUPLE: vnode-monitor < monitor fd ;
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: vnode-fflags ( -- n )
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{
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NOTE_DELETE
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NOTE_WRITE
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NOTE_EXTEND
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NOTE_ATTRIB
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NOTE_LINK
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NOTE_RENAME
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NOTE_REVOKE
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} flags ;
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: make-vnode-kevent ( fd flags -- kevent )
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"kevent" <c-object>
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tuck set-kevent-flags
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tuck set-kevent-ident
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EVFILT_VNODE over set-kevent-filter
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vnode-fflags over set-kevent-fflags ;
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: register-monitor ( monitor mx -- )
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>r dup fd>> r>
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[ >r EV_ADD EV_CLEAR bitor make-vnode-kevent r> register-kevent drop ]
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[ monitors>> set-at ] 3bi ;
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: unregister-monitor ( monitor mx -- )
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>r fd>> r>
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[ monitors>> delete-at ]
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[ >r EV_DELETE make-vnode-kevent r> register-kevent ] 2bi ;
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: <vnode-monitor> ( path mailbox -- monitor )
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>r [ O_RDONLY 0 open dup io-error ] keep r>
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vnode-monitor new-monitor swap >>fd
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[ dup kqueue-mx get register-monitor ] [ ] [ fd>> close ] cleanup ;
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M: vnode-monitor dispose
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[ kqueue-mx get unregister-monitor ] [ fd>> close ] bi ;
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