factor/basis/channels/channels.factor

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Factor

! Copyright (C) 2007 Chris Double. All Rights Reserved.
! See http://factorcode.org/license.txt for BSD license.
!
! Channels - based on ideas from newsqueak
USING: kernel sequences threads continuations
random math accessors random ;
IN: channels
TUPLE: channel receivers senders ;
: <channel> ( -- channel )
V{ } clone V{ } clone channel boa ;
GENERIC: to ( value channel -- )
GENERIC: from ( channel -- value )
<PRIVATE
: wait ( channel -- )
[ senders>> push ] curry
"channel send" suspend drop ;
: (to) ( value receivers -- )
delete-random resume-with yield ;
: notify ( continuation channel -- channel )
[ receivers>> push ] keep ;
: (from) ( senders -- )
delete-random resume ;
PRIVATE>
M: channel to ( value channel -- )
dup receivers>>
[ dup wait to ] [ nip (to) ] if-empty ;
M: channel from ( channel -- value )
[
notify senders>>
[ (from) ] unless-empty
] curry "channel receive" suspend ;