factor/extra/io/timeouts/timeouts.factor

! Copyright (C) 2008 Slava Pestov, Doug Coleman
! See http://factorcode.org/license.txt for BSD license.
USING: kernel calendar alarms io.streams.duplex ;
IN: io.timeouts

! Won't need this with new slot accessors
GENERIC: timeout ( obj -- dt/f )
GENERIC: set-timeout ( dt/f obj -- )

M: duplex-stream set-timeout
    2dup
    duplex-stream-in set-timeout
    duplex-stream-out set-timeout ;

GENERIC: timed-out ( obj -- )

M: object timed-out drop ;

: queue-timeout ( obj timeout -- alarm )
    from-now f rot [ timed-out ] curry add-alarm ;

: with-timeout ( obj quot -- )
    over dup timeout dup [
        queue-timeout slip cancel-alarm
    ] [
        2drop call
    ] if ; inline