Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!mintaka!spdcc!Cthulhu!raisch
From: raisch@Control.COM (Robert Raisch)
Newsgroups: comp.windows.ms
Subject: WARNING! Serious Memory Leak in MSWindows3.0 - BUG!
Summary: A leak in system memory
Keywords: windows microsoft memory leak BUG BUG BUG
Message-ID: <1346@cthulhuControl.COM>
Date: 4 Jun 91 17:10:00 GMT
Organization: Control Technology Corp., Hopkinton MA
Lines: 44

PROBLEM:

	Windows loses between 3 and 5 kbytes upon the *first* invocation
	of numerous programs.

BEHAVIOR:

	Before I invoke WhiteWater Group's ACTOR programming language
	on an ancient IBM-AT with 2048K of memory, Windows reports 
	1112Kb free, (this included the invocation of Usher that I
	use instead of the PROGMAN.)

	I then invoke ACTOR and am told that I have some 488Kb free.

	Leaving ACTOR, Windows reports 1108Kb available.

	Re-invocations of ACTOR do *NOT* eat up any more memory.

	It has been reported to me that other applications will
	also eat up memory, ONLY UPON THEIR FIRST INVOCATION.

THEORY:

	To the best of my knowledge, Windows saves window subclass
	structs and paint structs.  Since the apps that I have used
	do not use paint structs, I *believe* that this problem is
	Windows not releasing window subclassing structs back to 
	the memory pool.  If this is true, this is a SERIOUS bug.

PROOF:

	If someone with more time and expertise under Windows could
	create two simple programs, one that creates a new window
	subclass and then realizes a window of that type, and the 
	second which then tries to realize a window of the same type,
	ONCE THE FIRST PROGRAM HAS ENDED, this would prove the theory.

I would like to hear reports regarding this problem.  And if someone
more knowledgable than I in Windows programming could try to track this
down, I would be very appreciative.

Regards /rr  (Robert Raisch, Manager of Software R&D, Control Technology Corp)
-- 
"I ate his liver with some fava beans and a nice chianti." -Lector