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Re: st: Re: Win XP and Stata--was Stata for windows

From   Elizabeth Allred <[email protected]>
To   [email protected]
Subject   Re: st: Re: Win XP and Stata--was Stata for windows
Date   Mon, 06 Oct 2003 17:02:50 -0400

Sorry Alan, you are right of course! My apologies because I forgot to say that this is with Stata 7SE--still have some routines that I've been too lazy to upgrade. On the other hand, I never had the hanging problem in Stata 7 until I installed Stata 8.


Alan Riley wrote:

Unless Elizabeth is encountering a problem that is different than
Ben encountered, this was solved as of the September 9, 2003 update.
From -help whatsnew-:
    37.  (Windows XP) On some Dell platforms, Stata would fail to
         launch due to another process being frozen.  If frozen
         processes exist, Stata now works around this and still

If Elizabeth is already using the latest executable update and
is still encountering this problem, she should contact Stata
Technical Support at [email protected] so that people here
can help diagnose and solve the problem.

Those not interested in exceedingly technical details of this
issue should stop reading now.

When Stata starts, it loads the Stata font.  Microsoft documentation
tells us that we should let all other currently-running applications
know that this font has been loaded by sending them a broadcast
message.  Microsoft documents that this should be done with
a 'SendMessage(HWND_BROADCAST, WM_FONTCHANGE, ...)' call, which
sends a message to all top-level windows on the system letting them
know that the set of fonts currently available on the system has

This is where the freeze was occuring.  Windows will not return
control to Stata until all applications which receive that message
return control back to Windows.  If some other process on the system
is frozen, Windows will never get an answer back after sending
that message, and, in turn, Stata will never get control back
from Windows.

We worked around the issue by using a call other than SendMessage()
which guaranteed we would get control back even if some other
application on the system were frozen.  This means we aren't using
the Microsoft-documented method of letting other applications know about
the font change, but since that way results in Stata potentially
freezing, we feel our method is better.

([email protected])
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