1 ! Copyright (C) 2004, 2009 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors assocs kernel math namespaces sequences system
4 kernel.private byte-arrays arrays init ;
7 PREDICATE: pinned-alien < alien underlying>> not ;
9 UNION: pinned-c-ptr pinned-alien POSTPONE: f ;
11 GENERIC: >c-ptr ( obj -- c-ptr )
13 M: c-ptr >c-ptr ; inline
17 M: object >c-ptr underlying>> ; inline
19 GENERIC: expired? ( c-ptr -- ? ) flushable
21 M: alien expired? expired>> ;
23 M: f expired? drop t ;
25 : <alien> ( address -- alien )
26 f <displaced-alien> { pinned-c-ptr } declare ; inline
28 : <bad-alien> ( -- alien )
29 -1 <alien> t >>expired ; inline
33 2dup [ expired? ] either? [
36 [ alien-address ] bi@ =
42 M: simple-alien hashcode* nip dup expired>> [ drop 1234 ] [ alien-address ] if ;
44 ERROR: alien-callback-error ;
46 : alien-callback ( return parameters abi quot -- alien )
47 alien-callback-error ;
49 ERROR: alien-indirect-error ;
51 : alien-indirect ( ... funcptr return parameters abi -- )
52 alien-indirect-error ;
54 ERROR: alien-invoke-error library symbol ;
56 : alien-invoke ( ... return library function parameters -- ... )
57 2over alien-invoke-error ;
59 ! Callbacks are registered in a global hashtable. Note that they
60 ! are also pinned in a special callback area, so clearing this
61 ! hashtable will not reclaim callbacks. It should only be
65 [ H{ } clone callbacks set-global ] "alien" add-init-hook
69 TUPLE: expiry-check object alien ;
71 : recompute-value? ( check -- ? )
72 dup [ alien>> expired? ] [ drop t ] if ;
76 : initialize-alien ( symbol quot -- )
77 swap dup get-global dup recompute-value?
78 [ drop [ call dup 31337 <alien> expiry-check boa ] dip set-global ]
79 [ 2nip object>> ] if ; inline