56 lines
1.7 KiB
Factor
Executable File
56 lines
1.7 KiB
Factor
Executable File
! Copyright (C) 2004, 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 io.nonblocking io.unix.backend
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bit-arrays sequences assocs unix math namespaces structs ;
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IN: io.unix.select
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TUPLE: select-mx read-fdset write-fdset ;
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! Factor's bit-arrays are an array of bytes, OS X expects
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! FD_SET to be an array of cells, so we have to account for
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! byte order differences on big endian platforms
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: munge ( i -- i' )
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little-endian? [ BIN: 11000 bitxor ] unless ; inline
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: <select-mx> ( -- mx )
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select-mx construct-mx
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FD_SETSIZE 8 * <bit-array> over set-select-mx-read-fdset
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FD_SETSIZE 8 * <bit-array> over set-select-mx-write-fdset ;
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: clear-nth ( n seq -- ? )
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[ nth ] 2keep f -rot set-nth ;
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: handle-fd ( fd task fdset mx -- )
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roll munge rot clear-nth
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[ swap handle-io-task ] [ 2drop ] if ;
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: handle-fdset ( tasks fdset mx -- )
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[ handle-fd ] 2curry assoc-each ;
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: init-fdset ( tasks fdset -- )
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! dup clear-bits
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[ >r drop t swap munge r> set-nth ] curry assoc-each ;
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: read-fdset/tasks
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{ mx-reads select-mx-read-fdset } get-slots ;
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: write-fdset/tasks
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{ mx-writes select-mx-write-fdset } get-slots ;
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: max-fd dup assoc-empty? [ drop 0 ] [ keys supremum ] if ;
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: num-fds ( mx -- n )
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dup mx-reads max-fd swap mx-writes max-fd max 1+ ;
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: init-fdsets ( mx -- nfds read write except )
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[ num-fds ] keep
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[ read-fdset/tasks tuck init-fdset ] keep
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write-fdset/tasks tuck init-fdset
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f ;
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M: select-mx wait-for-events ( ms mx -- )
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swap >r dup init-fdsets r> dup [ make-timeval ] when
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select multiplexer-error
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dup read-fdset/tasks pick handle-fdset
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dup write-fdset/tasks rot handle-fdset ;
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