0.9.2.35:

  * bug fix: inner with-recursive-lock no longer releases the mutex

NEWS

@@ -31,6 +31,7 @@ changes in sbcl-0.9.3 relative to sbcl-0.9.2:
     ** bug fix: debugger doesn't hang on session lock if interrupted at
        an inappropriate moment
     ** bug fix: run-program is now thread safe(r)
+    ** bug fix: inner with-recursive-lock no longer releases the mutex
   * fixed some bugs revealed by Paul Dietz' test suite:
     ** TYPE-ERRORs from signalled by COERCE now have DATUM and
        EXPECTED-TYPE slots filled.

src/code/thread.lisp

@@ -12,6 +12,10 @@
 (in-package "SB!THREAD")
 
 (sb!xc:defmacro with-mutex ((mutex &key value (wait-p t)) &body body)
+  #!+sb-doc
+  "Acquire MUTEX for the dynamic scope of BODY, setting it to
+NEW-VALUE or some suitable default value if NIL.  If WAIT-P is non-NIL
+and the mutex is in use, sleep until it is available"
   #!-sb-thread (declare (ignore mutex value wait-p))
   #!+sb-thread
   (with-unique-names (got)
@@ -28,14 +32,21 @@
   `(locally ,@body))
 
 (sb!xc:defmacro with-recursive-lock ((mutex) &body body)
+  #!+sb-doc
+  "Acquires MUTEX for the dynamic scope of BODY. Within that scope
+further recursive lock attempts for the same mutex succeed. However,
+it is an error to mix WITH-MUTEX and WITH-RECURSIVE-LOCK for the same
+mutex."
   #!-sb-thread (declare (ignore mutex))
   #!+sb-thread
-  (with-unique-names (cfp)
-    `(let ((,cfp (sb!kernel:current-fp)))
-      (unless (and (mutex-value ,mutex)
-		   (sb!vm:control-stack-pointer-valid-p
-		    (sb!sys:int-sap
-		     (sb!kernel:get-lisp-obj-address (mutex-value ,mutex)))))
+  (with-unique-names (cfp inner-lock)
+    `(let ((,cfp (sb!kernel:current-fp))
+           (,inner-lock
+            (and (mutex-value ,mutex)
+                 (sb!vm:control-stack-pointer-valid-p
+                  (sb!sys:int-sap
+                   (sb!kernel:get-lisp-obj-address (mutex-value ,mutex)))))))
+      (unless ,inner-lock
 	;; this punning with MAKE-LISP-OBJ depends for its safety on
 	;; the frame pointer being a lispobj-aligned integer.  While
 	;; it is, then MAKE-LISP-OBJ will always return a FIXNUM, so
@@ -46,10 +57,7 @@
 	(get-mutex ,mutex (sb!kernel:make-lisp-obj (sb!sys:sap-int ,cfp))))
       (unwind-protect
 	   (locally ,@body)
-	(when (sb!sys:sap= (sb!sys:int-sap
-			    (sb!kernel:get-lisp-obj-address
-			     (mutex-value ,mutex)))
-			   ,cfp)
+        (unless ,inner-lock
 	  (release-mutex ,mutex)))))
   #!-sb-thread
   `(locally ,@body))

tests/threads.impure.lisp

@@ -77,6 +77,20 @@
   (assert (eql (mutex-lock l) 0)  nil "6")
   (describe l))
 
+(labels ((ours-p (value)
+           (sb-vm:control-stack-pointer-valid-p
+            (sb-sys:int-sap (sb-kernel:get-lisp-obj-address value)))))
+  (let ((l (make-mutex :name "rec")))
+    (assert (eql (mutex-value l) nil) nil "1")
+    (assert (eql (mutex-lock l) 0) nil "2")
+    (sb-thread:with-recursive-lock (l)
+      (assert (ours-p (mutex-value l)) nil "3")
+      (sb-thread:with-recursive-lock (l)
+        (assert (ours-p (mutex-value l)) nil "4"))
+      (assert (ours-p (mutex-value l)) nil "5"))
+    (assert (eql (mutex-value l) nil) nil "6")
+    (assert (eql (mutex-lock l) 0) nil "7")))
+
 (let ((l (make-waitqueue :name "spinlock"))
       (p *current-thread*))
   (assert (eql (waitqueue-lock l) 0) nil "1")

version.lisp-expr

@@ -17,4 +17,4 @@
 ;;; checkins which aren't released. (And occasionally for internal
 ;;; versions, especially for internal versions off the main CVS
 ;;; branch, it gets hairier, e.g. "0.pre7.14.flaky4.13".)
-"0.9.2.34"
+"0.9.2.35"