r2914: rename .cl files

[clsql.git] / db-oracle / alien-resources.lisp

diff --git a/db-oracle/alien-resources.lisp b/db-oracle/alien-resources.lisp
new file mode 100644 (file)
index 0000000..97dafb6
--- /dev/null
+++ b/db-oracle/alien-resources.lisp
@@ -0,0 +1,57 @@
+;;; -*- Mode: Lisp -*-
+;;; $Id: alien-resources.lisp,v 1.1 2002/09/30 10:19:23 kevin Exp $
+
+;;; This is copyrighted software.  See documentation for terms.
+;;; 
+;;; oracle-sql.lisp --- SQL-Interface implementation for Oracle
+;;;
+;;; derived from postgresql.lisp
+
+(in-package :clsql-oracle)
+
+(declaim (optimize (speed 3)
+                  (debug 1)))
+
+(defparameter *alien-resource-hash* (make-hash-table :test #'equal))
+
+(defun %get-resource (type sizeof)
+  (let ((resources (gethash type *alien-resource-hash*)))
+    (car (member-if
+         #'(lambda (res)
+             (and (= (alien-resource-sizeof res) sizeof)
+                  (not (alien-resource-in-use res))))
+         resources))))
+
+(defun %insert-alien-resource (type res)
+  (let ((resource (gethash type *alien-resource-hash*)))
+    (setf (gethash type *alien-resource-hash*)
+         (cons res (gethash type *alien-resource-hash*)))))
+
+(defmacro acquire-alien-resource (type &optional size)
+  `(let ((res (%get-resource ',type ,size)))
+     (unless res
+       (setf res (make-alien-resource
+                 :type ',type :sizeof ,size
+                 :buffer (make-alien ,type ,size)))
+       (%insert-alien-resource ',type res))
+     (claim-alien-resource res)))
+              
+(defstruct (alien-resource)
+  (type (error "Missing TYPE.")
+       :read-only t)
+  (sizeof (error "Missing SIZEOF.")
+         :read-only t)
+  (buffer (error "Missing BUFFER.")
+         :read-only t)
+  (in-use nil :type boolean))
+
+(defun free-alien-resource (ares)
+  (setf (alien-resource-in-use ares) nil)
+  ares)
+
+(defun claim-alien-resource (ares)
+  (setf (alien-resource-in-use ares) t)
+  ares)
+
+
+