Import Tcl 8.6.10

generic/tclNamesp.c

@@ -915,6 +915,11 @@ Tcl_DeleteNamespace(
     Tcl_HashSearch search;
     Command *cmdPtr;
 
+    /*
+     * Ensure that this namespace doesn't get deallocated in the meantime.
+     */
+    nsPtr->refCount++;
+
     /*
      * Give anyone interested - notably TclOO - a chance to use this namespace
      * normally despite the fact that the namespace is going to go. Allows the
@@ -1047,16 +1052,7 @@ Tcl_DeleteNamespace(
 #endif
 	    Tcl_DeleteHashTable(&nsPtr->cmdTable);
 
-	    /*
-	     * If the reference count is 0, then discard the namespace.
-	     * Otherwise, mark it as "dead" so that it can't be used.
-	     */
-
-	    if (nsPtr->refCount == 0) {
-		NamespaceFree(nsPtr);
-	    } else {
-		nsPtr->flags |= NS_DEAD;
-	    }
+	    nsPtr ->flags |= NS_DEAD;
 	} else {
 	    /*
 	     * Restore the ::errorInfo and ::errorCode traces.
@@ -1073,6 +1069,14 @@ Tcl_DeleteNamespace(
 	    nsPtr->flags &= ~(NS_DYING|NS_KILLED);
 	}
     }
+    TclNsDecrRefCount(nsPtr);
+}
+
+int
+TclNamespaceDeleted(
+    Namespace *nsPtr)
+{
+    return (nsPtr->flags & NS_DYING) ? 1 : 0;
 }
 
 /*
@@ -2422,6 +2426,35 @@ TclGetNamespaceForQualName(
     return TCL_OK;
 }
 
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclEnsureNamespace --
+ *
+ *	Provide a namespace that is not deleted.
+ *
+ * Value
+ *
+ *	namespacePtr, if it is not scheduled for deletion, or a pointer to a
+ *	new namespace with the same name otherwise.
+ *
+ * Effect
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+Tcl_Namespace *
+TclEnsureNamespace(
+    Tcl_Interp *interp,
+    Tcl_Namespace *namespacePtr)
+{
+    Namespace *nsPtr = (Namespace *) namespacePtr;
+    if (!(nsPtr->flags & NS_DYING)) {
+	    return namespacePtr;
+    }
+    return Tcl_CreateNamespace(interp, nsPtr->fullName, NULL, NULL);
+}
+
 /*
  *----------------------------------------------------------------------
  *
@@ -2639,7 +2672,7 @@ Tcl_FindCommand(
 	Namespace *nsPtr[2];
 	register int search;
 
-	TclGetNamespaceForQualName(interp, name, (Namespace *) contextNsPtr,
+	TclGetNamespaceForQualName(interp, name, cxtNsPtr,
 		flags, &nsPtr[0], &nsPtr[1], &cxtNsPtr, &simpleName);
 
 	/*