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;;;; Objective-CL, an Objective-C bridge for Common Lisp.
;;;; Copyright (C) 2007 Matthias Andreas Benkard.
;;;;
;;;; This program is free software: you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public License
;;;; as published by the Free Software Foundation, either version 3 of
;;;; the License, or (at your option) any later version.
;;;;
;;;; This program is distributed in the hope that it will be useful, but
;;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this program. If not, see
;;;; <http://www.gnu.org/licenses/>.
(in-package #:mulk.objective-cl)
(defvar *global-lock* (cons nil nil))
(defmacro atomically (&body body)
`(with-exclusive-access (*global-lock*)
,@body))
(defmacro with-exclusive-access ((&rest objects) &body body)
(etypecase objects
(null `(progn ,@body))
(cons `(with-lock ,(first objects)
(with-exclusive-access ,(rest objects)
,@body)))))
(defmacro with-lock (object &body body)
;; FIXME: Implement LOCK-FOR-OBJECT.
`(progn ,@body)
#+(or)
(let ((lock (gensym "LOCK")))
`(let ((,lock (lock-for-object ,object)))
(prog2
(%objcl-acquire-lock ,lock)
(progn ,@body)
(%objcl-release-lock ,lock)))))
(defun featurep (symbol)
(member symbol *features*))
(defmacro with-foreign-string-pool ((register-fn-name
allocate-fn-name) &body body)
(let ((pool-var (gensym)))
`(let ((,pool-var (list)))
(labels ((,register-fn-name (x)
(push x ,pool-var)
x)
(,allocate-fn-name (string)
(,register-fn-name
(cffi:foreign-string-alloc string))))
(unwind-protect
(progn ,@body)
(dolist (x ,pool-var)
(cffi:foreign-string-free x)))))))
(defmacro with-foreign-object-pool ((register-fn-name) &body body)
(let ((pool-var (gensym)))
`(let ((,pool-var (list)))
(flet ((,register-fn-name (x)
(push x ,pool-var)
x))
(unwind-protect
(progn ,@body)
(dolist (x ,pool-var)
(cffi:foreign-free x)))))))
(defmacro defcoercion (to-class (object) &body body)
(let ((type-sym (gensym)))
`(defmethod coerce-object (,object (,type-sym (eql ',to-class)))
,@body)))
;; Compatibility with older versions of CFFI.
(unless (fboundp 'foreign-funcall-pointer)
(defmacro foreign-funcall-pointer (pointer options &rest args)
(if (find-symbol "FOREIGN-FUNCALL-POINTER" '#:cffi)
`(cffi:foreign-funcall-pointer ,pointer ,options ,@args)
`(cffi:foreign-funcall (,pointer ,@options) ,@args))))
;; Caching of function values.
(defmacro define-cached-function (name lambda-list hashing-form &body body)
"Define a function and cache its result in a hash table. The hash key
is computed according to HASHING-FORM.
Note that HASHING-FORM is expected to return a freshly consed object
that can be garbage collected. It is not recommended to use an atom as
a HASHING-FORM if the value of the atom might itself be an interned atom
or any other value that might never be deleted by the garbage
collector."
(let ((hash-table (gensym))
(value (gensym))
(default-value (gensym))
(hash-key (gensym))
(no-weak-hashing-p (handler-case
(prog1 nil
(tg:make-weak-hash-table :weakness :key
:test 'equal))
(serious-condition () t))))
(if no-weak-hashing-p
`(defun ,name ,lambda-list ,@body)
`(let ((,hash-table (tg:make-weak-hash-table :weakness :key
:test 'equal)))
(defun ,name ,lambda-list
(let* ((,hash-key ,hashing-form)
(,value (gethash ,hash-key ,hash-table ',default-value)))
(if (eq ',default-value ,value)
(values-list
(setf (gethash ,hash-key ,hash-table)
(multiple-value-list (progn ,@body))))
(values-list ,value))))))))
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