Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!rochester!rocksanne!jhs
From: jhs@rocksanne.UUCP (Hans Schlichter)
Newsgroups: comp.windows.x
Subject: destroying widgets recursively
Keywords: toolkit, XtDestroyWidget
Message-ID: <748@rocksanne.UUCP>
Date: 5 May 89 17:05:16 GMT
Organization: Xerox: Webster Research Center, Rochester, NY
Lines: 20

The Athena Toolkit seems to have problems in destroying recursive widgets
(is this an already known problem?).

I have the following situation. I have a popup window A which has several
fields and 2 buttons: apply, cancel. If I press "apply" and the fields
contained an error, I popup another window B (popupshell) whose parent
is A. B contains 2 buttons: correct, and cancel.

Pressing "correct" in B, destroys B and I am back in A. Pressing "cancel"
in B first destroys B and then destroys A; and that's when
I run into problems. In the main event loop the routine
XtDispatchEvent invokes  XtPhase2Destroy which
attempts to free a block which was already been freed (I found this by
accident because I ran my program with memory verify on).

I use a SUN 4-260 with OS4.0 and X11R3
/Hans

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