88 lines
2.3 KiB
Factor
Executable File
88 lines
2.3 KiB
Factor
Executable File
! Copyright (C) 2008 Slava Pestov.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: dlists kernel concurrency.threads continuations math ;
|
|
IN: concurrency.locks
|
|
|
|
! Simple critical sections
|
|
TUPLE: lock threads owner ;
|
|
|
|
: <lock> <dlist> lock construct-boa ;
|
|
|
|
: notify-1 ( dlist -- )
|
|
dup dlist-empty? [ pop-back resume ] [ drop ] if ;
|
|
|
|
<PRIVATE
|
|
|
|
: wait-for-lock ( lock -- )
|
|
[ swap lock-threads push-front ] suspend drop ;
|
|
|
|
: acquire-lock ( lock -- )
|
|
dup lock-owner [ wait-for-lock ] when
|
|
self swap set-lock-owner ;
|
|
|
|
: release-lock ( lock -- )
|
|
f over set-lock-owner
|
|
lock-threads notify-1 ;
|
|
|
|
: do-lock ( lock quot acquire release -- )
|
|
>r >r over r> call over r> curry [ ] cleanup ; inline
|
|
|
|
PRIVATE>
|
|
|
|
: with-lock ( lock quot -- )
|
|
[ acquire-lock ] [ release-lock ] do-lock ; inline
|
|
|
|
: with-reentrant-lock ( lock quot -- )
|
|
over lock-owner self eq?
|
|
[ nip call ] [ with-lock ] if ; inline
|
|
|
|
! Many-reader/single-writer locks
|
|
TUPLE: rw-lock readers writers reader# writer ;
|
|
|
|
: <rw-lock> ( -- lock )
|
|
<dlist> <dlist> 0 f rw-lock construct-boa ;
|
|
|
|
<PRIVATE
|
|
|
|
: wait-for-read-lock ( lock -- )
|
|
[ swap lock-readers push-front ] suspend drop ;
|
|
|
|
: acquire-read-lock ( lock -- )
|
|
dup rw-lock-writer [ dup wait-for-read-lock ] when
|
|
dup rw-lock-reader# 1+ swap set-rw-lock-reader# ;
|
|
|
|
: notify-writer ( lock -- )
|
|
lock-writers notify-1 ;
|
|
|
|
: release-read-lock ( lock -- )
|
|
dup rw-lock-reader# 1- dup pick set-rw-lock-reader#
|
|
zero? [ notify-writers ] [ drop ] if ;
|
|
|
|
: wait-for-write-lock ( lock -- )
|
|
[ swap lock-writers push-front ] suspend drop ;
|
|
|
|
: acquire-write-lock ( lock -- )
|
|
dup rw-lock-writer over rw-lock-reader# 0 > or
|
|
[ dup wait-for-write-lock ] when
|
|
self over set-rw-lock-writer ;
|
|
|
|
: release-write-lock ( lock -- )
|
|
f over set-rw-lock-writer
|
|
dup rw-lock-readers dlist-empty?
|
|
[ notify-writer ] [ rw-lock-readers notify-all ] if ;
|
|
|
|
: do-recursive-rw-lock ( lock quot quot' -- )
|
|
>r over rw-lock-writer self eq? [ nip call ] r> if ; inline
|
|
|
|
PRIVATE>
|
|
|
|
: with-read-lock ( lock quot -- )
|
|
[
|
|
[ acquire-read-lock ] [ release-read-lock ] do-lock
|
|
] do-recursive-rw-lock ; inline
|
|
|
|
: with-write-lock ( lock quot -- )
|
|
[
|
|
[ acquire-write-lock ] [ release-write-lock ] do-lock
|
|
] do-recursive-rw-lock ; inline
|