34 lines
1.0 KiB
Factor
Executable File
34 lines
1.0 KiB
Factor
Executable File
! Copyright (C) 2008 Slava Pestov.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: dlists kernel threads math concurrency.conditions
|
|
continuations ;
|
|
IN: concurrency.semaphores
|
|
|
|
TUPLE: semaphore count threads ;
|
|
|
|
: <semaphore> ( n -- semaphore )
|
|
dup 0 < [ "Cannot have semaphore with negative count" throw ] when
|
|
<dlist> semaphore boa ;
|
|
|
|
: wait-to-acquire ( semaphore timeout -- )
|
|
>r semaphore-threads r> "semaphore" wait ;
|
|
|
|
: acquire-timeout ( semaphore timeout -- )
|
|
over semaphore-count zero?
|
|
[ dupd wait-to-acquire ] [ drop ] if
|
|
dup semaphore-count 1- swap set-semaphore-count ;
|
|
|
|
: acquire ( semaphore -- )
|
|
f acquire-timeout ;
|
|
|
|
: release ( semaphore -- )
|
|
dup semaphore-count 1+ over set-semaphore-count
|
|
semaphore-threads notify-1 ;
|
|
|
|
: with-semaphore-timeout ( semaphore timeout quot -- )
|
|
pick rot acquire-timeout swap
|
|
[ release ] curry [ ] cleanup ; inline
|
|
|
|
: with-semaphore ( semaphore quot -- )
|
|
over acquire swap [ release ] curry [ ] cleanup ; inline
|