X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Ftarget-unithread.lisp;h=e11ec9d3eb188d17b4e920b55101bcfb700ec42a;hb=02c9007b4ca5753406f60019f4fe5e5f8392541a;hp=c684a3c32be8bbbc10c78f76fa4e4b10d7814adf;hpb=ce3d6da896e35c9e202db443c5cfc9fedcf65ebe;p=sbcl.git

diff --git a/src/code/target-unithread.lisp b/src/code/target-unithread.lisp
index c684a3c..e11ec9d 100644
--- a/src/code/target-unithread.lisp
+++ b/src/code/target-unithread.lisp
@@ -91,8 +91,15 @@
      (setf old-value t1))))
 
 (defmacro with-mutex ((mutex &key value (wait-p t))  &body body)
-  (declare (ignore mutex value wait-p))
-  `(progn ,@body))
+  (cond ((not wait-p)
+	 `(unless (mutex-value ,mutex)
+	   (unwind-protect
+		(progn
+		  (setf (mutex-value ,mutex) (or ,value t))
+		  ,@body)
+	     (setf (mutex-value ,mutex) nil))))
+	(t 
+	 `(progn ,@body))))
 
 ;;; what's the best thing to do with these on unithread?
 #+NIl