From: espen <espen>
Date: Tue, 22 Aug 2000 23:13:39 +0000 (+0000)
Subject: Implemeted object/quark mapping
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/clg/commitdiff_plain/0aef1da83378c41306f31f5cb9f29681baea38e9

Implemeted object/quark mapping
---

diff --git a/glib/glib.lisp b/glib/glib.lisp
index 891196a..4af0e94 100644
--- a/glib/glib.lisp
+++ b/glib/glib.lisp
@@ -15,7 +15,7 @@
 ;; License along with this library; if not, write to the Free Software
 ;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
-;; $Id: glib.lisp,v 1.2 2000-08-15 23:25:18 espen Exp $
+;; $Id: glib.lisp,v 1.3 2000-08-22 23:13:39 espen Exp $
 
 
 (in-package "GLIB")
@@ -40,6 +40,38 @@ (defun copy-memory (from length &optional (to (allocate-memory length)))
 
 
 
+;;;; Quarks
+
+(deftype quark () 'unsigned)
+
+(define-foreign %quark-get-reserved () quark)
+
+(defvar *quark-from-object* (make-hash-table))
+(defvar *quark-to-object* (make-hash-table))
+
+(defun quark-from-object (object &key (test #'eq))
+  (let ((hash-code (sxhash object)))
+    (or
+     (assoc-ref object (gethash hash-code *quark-from-object*) :test test)
+     (let ((quark (%quark-get-reserved)))
+       (push (cons object quark) (gethash hash-code *quark-from-object*))
+       (setf (gethash quark *quark-to-object*) object)
+       quark))))
+
+(defun quark-to-object (quark) 
+  (gethash quark *quark-to-object*))
+  
+(defun remove-quark (quark)
+  (let* ((object (gethash quark *quark-to-object*))
+	 (hash-code (sxhash object)))
+    (remhash quark *quark-to-object*)
+    (unless (setf
+	     (gethash hash-code *quark-from-object*)
+	     (assoc-delete object (gethash hash-code *quark-from-object*)))
+      (remhash hash-code *quark-from-object*))))
+
+
+
 ;;;; Linked list
 
 (deftype glist () 'pointer)