X-Git-Url: http://git.kpe.io/?p=clsql.git;a=blobdiff_plain;f=db-oracle%2Falien-resources.lisp;fp=db-oracle%2Falien-resources.lisp;h=97dafb6ca309814d358aa0cb43515ad64d3a8579;hp=0000000000000000000000000000000000000000;hb=7d50938ba2db52a713498e49aa1679deae6f0b6b;hpb=998937376fa6f9ce29bd3c7954fb0ebca91c37d7

diff --git a/db-oracle/alien-resources.lisp b/db-oracle/alien-resources.lisp
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+;;; -*- 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)
+
+
+