Build instructions updated for SBCL with native C callback support

[clg] / glib / glib.lisp

diff --git a/glib/glib.lisp b/glib/glib.lisp
index d5c68568cb8314dc673a5e96515286e50b7dd205..be287eb24f4062d412b9413d8e0aaa0a5e484258 100644 (file)
--- a/glib/glib.lisp
+++ b/glib/glib.lisp
@@ -20,7 +20,7 @@
 ;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 ;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-;; $Id: glib.lisp,v 1.32 2006/02/06 18:12:19 espen Exp $
+;; $Id: glib.lisp,v 1.34 2006/02/15 09:53:42 espen Exp $
 
 
 (in-package "GLIB")
@@ -47,6 +47,17 @@ (defun copy-memory (from length &optional (to (allocate-memory length)))
   #+sbcl(system-area-ub8-copy from 0 to 0 length)
   to)
 
+(defmacro with-allocated-memory ((var size) &body body)
+  (if (constantp size)
+      (let ((alien (make-symbol "ALIEN")))
+       `(with-alien ((,alien (array #+sbcl(sb-alien:unsigned 8) #+cmu(alien:unsigned 8) ,(eval size))))
+          (let ((,var (alien-sap ,alien)))
+            ,@body)))
+    `(let ((,var (allocate-memory ,size)))
+       (unwind-protect
+          (progn ,@body)
+        (deallocate-memory ,var)))))
+
 
 ;;;; User data mechanism