Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!uw-june!roper
From: roper@june.cs.washington.edu (Michael Roper)
Newsgroups: comp.windows.ms
Subject: Re: Does DialogBox preserve Data Segment Address?
Message-ID: <7226@june.cs.washington.edu>
Date: 9 Feb 89 20:53:30 GMT
References: <460@msn005.misemi> <1366@agora.UUCP> <3816@metavax.UUCP>
Organization: U of Washington, Computer Science, Seattle
Lines: 14

adam@metavax.UUCP writes:

> Does anyone know if Windows locks the data segment while 
> a DialogBox is active?  I have a feeling that DialogBox 
> (the function) does nothing special about locking the data 
> segment while it calls PeekMessage or whatever it calls... 

Windows locks your data segment when you get the CPU.  As far 
as I know, the only way it can move unexpectedly during this 
period is if you do a LocalAlloc() or LocalRealloc().  However, 
this will result in a move only if the heap must be extended 
and then only if it can't be extended without moving the segment.

Mike Roper