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-rw-r--r--win/tclWinThrd.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/win/tclWinThrd.c b/win/tclWinThrd.c
index 9667d7d..62a538b 100644
--- a/win/tclWinThrd.c
+++ b/win/tclWinThrd.c
@@ -10,7 +10,7 @@
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tclWinThrd.c,v 1.48 2008/07/24 21:54:43 nijtmans Exp $
+ * RCS: @(#) $Id: tclWinThrd.c,v 1.49 2008/10/13 22:51:31 patthoyts Exp $
*/
#include "tclWinInt.h"
@@ -155,6 +155,10 @@ TclpThreadCreate(
EnterCriticalSection(&joinLock);
+ *idPtr = 0; /* must initialize as Tcl_Thread is a pointer and
+ * on WIN64 sizeof void* != sizeof unsigned
+ */
+
#if defined(_MSC_VER) || defined(__MSVCRT__) || defined(__BORLANDC__)
tHandle = (HANDLE) _beginthreadex(NULL, (unsigned) stackSize, proc,
clientData, 0, (unsigned *)idPtr);