*** win/tclWinNotify.c 1999/07/02 22:08:28 1.5 
--- win/tclWinNotify.c 2000/06/05 00:50:37 
*************** 
*** 150,155 **** 
--- 150,163 ---- 
{ 
ThreadSpecificData *tsdPtr = (ThreadSpecificData *) clientData; 

+ /* 
+ * Should the operating system call DllMain() with 
+ * DLL_PROCESS_DETACH from any alternate thread path, such 
+ * as Task Manager terminating the process, tsdPtr will 
+ * be NULL and invalid. 
+ */ 
+ if (tsdPtr == NULL) return; 
+ 
DeleteCriticalSection(&tsdPtr->crit); 
CloseHandle(tsdPtr->event);