X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fthread.lisp;h=1e622ce9e51f88a82419bc074a2b238b8444d137;hb=dfa8294a1580e8aa099a92baebba7d9caddb2fcb;hp=1f2ddcc2dabdcefb99b97d6d769102cdf4e80fcd;hpb=15e14ef1ccd3ab6f4711632435a40493dc4cdd9d;p=sbcl.git

diff --git a/src/code/thread.lisp b/src/code/thread.lisp
index 1f2ddcc..1e622ce 100644
--- a/src/code/thread.lisp
+++ b/src/code/thread.lisp
@@ -1,7 +1,34 @@
+;;;; support for threads needed at cross-compile time
+
+;;;; This software is part of the SBCL system. See the README file for
+;;;; more information.
+;;;;
+;;;; This software is derived from the CMU CL system, which was
+;;;; written at Carnegie Mellon University and released into the
+;;;; public domain. The software is in the public domain and is
+;;;; provided with absolutely no warranty. See the COPYING and CREDITS
+;;;; files for more information.
+
 (in-package "SB!THREAD")
 
+(sb!xc:defmacro with-mutex ((mutex &key value (wait-p t)) &body body)
+  #!-sb-thread (declare (ignore mutex value wait-p))
+  #!+sb-thread
+  (with-unique-names (got)
+    `(let ((,got (get-mutex ,mutex ,value ,wait-p)))
+      (when ,got
+	(unwind-protect
+	     (locally ,@body)
+	  (release-mutex ,mutex)))))
+  ;; KLUDGE: this separate expansion for (NOT SB-THREAD) is not
+  ;; strictly necessary; GET-MUTEX and RELEASE-MUTEX are implemented.
+  ;; However, there would be a (possibly slight) performance hit in
+  ;; using them.
+  #!-sb-thread
+  `(locally ,@body))
+
 (sb!xc:defmacro with-recursive-lock ((mutex) &body body)
-  (declare (ignore #!-sb-thread mutex))
+  #!-sb-thread (declare (ignore mutex))
   #!+sb-thread
   (with-unique-names (cfp)
     `(let ((,cfp (sb!kernel:current-fp)))
@@ -18,12 +45,12 @@
 	;; confuse GC completely.  -- CSR, 2003-06-03
 	(get-mutex ,mutex (sb!kernel:make-lisp-obj (sb!sys:sap-int ,cfp))))
       (unwind-protect
-	   (progn ,@body)
+	   (locally ,@body)
 	(when (sb!sys:sap= (sb!sys:int-sap
 			    (sb!kernel:get-lisp-obj-address
 			     (mutex-value ,mutex)))
 			   ,cfp)
 	  (release-mutex ,mutex)))))
   #!-sb-thread
-  `(progn ,@body))
+  `(locally ,@body))