X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fsymbol.lisp;h=c95370fa7753ac1dcd764e1183d7fa08b194e8fe;hb=9837343101c3da7b3a8f94609ec116ec5025436a;hp=f4a7888042bf53641be6d75737a7e0f23d537444;hpb=62b6c13eaaefa20b790e10a28d292e1821cd4446;p=sbcl.git

diff --git a/src/code/symbol.lisp b/src/code/symbol.lisp
index f4a7888..c95370f 100644
--- a/src/code/symbol.lisp
+++ b/src/code/symbol.lisp
@@ -32,20 +32,37 @@
   #!+sb-doc
   "Set SYMBOL's value cell to NEW-VALUE."
   (declare (type symbol symbol))
-  (about-to-modify-symbol-value symbol)
+  (about-to-modify-symbol-value symbol 'set new-value)
   (%set-symbol-value symbol new-value))
 
 (defun %set-symbol-value (symbol new-value)
   (%set-symbol-value symbol new-value))
 
+(defun symbol-global-value (symbol)
+  #!+sb-doc
+  "Return the SYMBOL's current global value. Identical to SYMBOL-VALUE,
+in single-threaded builds: in multithreaded builds bound values are
+distinct from the global value. Can also be SETF."
+  (declare (optimize (safety 1)))
+  (symbol-global-value symbol))
+
+(defun set-symbol-global-value (symbol new-value)
+  (about-to-modify-symbol-value symbol 'set new-value)
+  (sb!kernel:%set-symbol-global-value symbol new-value))
+
+(declaim (inline %makunbound))
+(defun %makunbound (symbol)
+  (%set-symbol-value symbol (%primitive sb!c:make-other-immediate-type
+                                        0 sb!vm:unbound-marker-widetag)))
+
 (defun makunbound (symbol)
   #!+sb-doc
   "Make SYMBOL unbound, removing any value it may currently have."
   (with-single-package-locked-error (:symbol symbol "unbinding the symbol ~A")
-    (set symbol
-         (%primitive sb!c:make-other-immediate-type
-                     0
-                     sb!vm:unbound-marker-widetag))
+    (when (and (info :variable :always-bound symbol))
+      (error "Can't make ~A variable unbound: ~S" 'always-bound symbol))
+    (about-to-modify-symbol-value symbol 'makunbound)
+    (%makunbound symbol)
     symbol))
 
 ;;; Return the built-in hash value for SYMBOL.