From a01400deb8629465006faa71d0173f26abcb8e79 Mon Sep 17 00:00:00 2001
From: Miguel Sofer <miguel.sofer@gmail.com>
Date: Sun, 13 Nov 2005 01:21:39 +0000
Subject: 	* generic/tclBasic.c (Tcl_DeleteCommandFromToken): 	*
 generic/tclObj.c (Tcl_GetCommandFromObj): more partial fixes for 	[Bug
 1354540] - making sure that cached references to a command 	being deleted
 cannot be made reusable by a delete trace.

---
 ChangeLog          |  7 +++++++
 generic/tclBasic.c | 12 +++---------
 generic/tclObj.c   |  4 ++--
 3 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 4c17f79..39f0d06 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2005-11-12  Miguel Sofer <msofer@users.sf.net>
+
+	* generic/tclBasic.c (Tcl_DeleteCommandFromToken):
+	* generic/tclObj.c (Tcl_GetCommandFromObj): more partial fixes for
+	[Bug 1354540] - making sure that cached references to a command
+	being deleted cannot be made reusable by a delete trace.
+
 2005-11-12  Donal K. Fellows  <dkf@users.sf.net>
 
 	* generic/tclNamesp.c (Tcl_FindCommand): Do not find commands in dead
diff --git a/generic/tclBasic.c b/generic/tclBasic.c
index ace490a..125afe0 100644
--- a/generic/tclBasic.c
+++ b/generic/tclBasic.c
@@ -13,7 +13,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclBasic.c,v 1.179 2005/11/12 02:01:10 das Exp $
+ * RCS: @(#) $Id: tclBasic.c,v 1.180 2005/11/13 01:21:39 msofer Exp $
  */
 
 #include "tclInt.h"
@@ -2441,13 +2441,6 @@ Tcl_DeleteCommandFromToken(
     Tcl_Command importCmd;
 
     /*
-     * Bump the command epoch counter. This will invalidate all cached
-     * references that point to this command.
-     */
-
-    cmdPtr->cmdEpoch++;
-
-    /*
      * The code here is tricky. We can't delete the hash table entry before
      * invoking the deletion callback because there are cases where the
      * deletion callback needs to invoke the command (e.g. object systems such
@@ -2477,7 +2470,8 @@ Tcl_DeleteCommandFromToken(
      * may try to avoid this (renaming the command etc). Also traces and
      * delete procs may try to delete the command themsevles. This flag
      * declares that a delete is in progress and that recursive deletes should
-     * be ignored.
+     * be ignored. It also invalidates all cached references that point to
+     * this command. 
      */
 
     cmdPtr->flags |= CMD_IS_DELETED;
diff --git a/generic/tclObj.c b/generic/tclObj.c
index 229c2ab..e82d2dc 100644
--- a/generic/tclObj.c
+++ b/generic/tclObj.c
@@ -12,7 +12,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclObj.c,v 1.98 2005/11/11 22:20:24 msofer Exp $
+ * RCS: @(#) $Id: tclObj.c,v 1.99 2005/11/13 01:21:39 msofer Exp $
  */
 
 #include "tclInt.h"
@@ -3503,7 +3503,7 @@ Tcl_GetCommandFromObj(
 	    && (resPtr->refNsId == currNsPtr->nsId)
 	    && (resPtr->refNsCmdEpoch == currNsPtr->cmdRefEpoch)) {
 	cmdPtr = resPtr->cmdPtr;
-	if ((cmdPtr->cmdEpoch != resPtr->cmdEpoch) || (cmdPtr->hPtr == NULL)) {
+	if ((cmdPtr->cmdEpoch != resPtr->cmdEpoch) || (cmdPtr->flags & CMD_IS_DELETED)) {
 	    cmdPtr = NULL;
 	}
     }
-- 
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