2 ;;; $Id: alien-resources.lisp,v 1.1 2002/04/01 05:27:55 kevin Exp $
4 ;;; MaiSQL --- Common Lisp Interface Layer to SQL Databases
5 ;;; This is copyrighted software. See documentation for terms.
7 ;;; oracle-sql.lisp --- SQL-Interface implementation for Oracle
9 ;;; derived from postgresql.lisp
11 (in-package :MAISQL-ORACLE)
13 (declaim (optimize (speed 3)
16 (defparameter *alien-resource-hash* (make-hash-table :test #'equal))
18 (defun %get-resource (type sizeof)
19 (let ((resources (gethash type *alien-resource-hash*)))
22 (and (= (alien-resource-sizeof res) sizeof)
23 (not (alien-resource-in-use res))))
26 (defun %insert-alien-resource (type res)
27 (let ((resource (gethash type *alien-resource-hash*)))
28 (setf (gethash type *alien-resource-hash*)
29 (cons res (gethash type *alien-resource-hash*)))))
31 (defmacro acquire-alien-resource (type &optional size)
32 `(let ((res (%get-resource ',type ,size)))
34 (setf res (make-alien-resource
35 :type ',type :sizeof ,size
36 :buffer (make-alien ,type ,size)))
37 (%insert-alien-resource ',type res))
38 (claim-alien-resource res)))
40 (defstruct (alien-resource)
41 (type (error "Missing TYPE.")
43 (sizeof (error "Missing SIZEOF.")
45 (buffer (error "Missing BUFFER.")
47 (in-use nil :type boolean))
49 (defun free-alien-resource (ares)
50 (setf (alien-resource-in-use ares) nil)
53 (defun claim-alien-resource (ares)
54 (setf (alien-resource-in-use ares) t)