Re: Is this .NET problem

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From: Ramesh K (krh_at_srasys.co.in)
Date: 04/14/04 

Date: Wed, 14 Apr 2004 09:57:00 +0530

Hi,
    Thanks for the reply.
    Even after waiting for a while these references are not getting
released.

Regards,
Ramesh

"intrader" <intrader@attglobal.net> wrote in message
news:hx2fc.11067$GU.8360@twister.socal.rr.com...
> Ramesh K wrote:
>
> > Hi All,
> > During Attach to a process like DLLHOST ,DLLHOST has FILE references
> > to
> > the system dlls like " odbc32.dll etc..(One can observer this in process
> > explorer tool of Sysinternals.com by selecting the "View Handles" from
the
> > View menu)
> >
> > But during the Detach process same handles are not getting released by
> > the
> > DLLHOST process.WHY?
> >
> > My application has a requirement that the custom dlls loadded into
DLLHOST
> > can be unloaded(using cofreeunsued libraries) and modified whenever
> > needed, because of the above problem unakbe to update the custom dll.
> >
> >
> > steps to be folowed to simuate the problem.
> > Step1) create a C++ COM component named "A" and another C++ COM
component
> > named "B" which creates "A" upon a method invocation let us say
> > CreateMe().Add another method in "B" to unload the component "A" letus
say
> > KillMe()..in this method release the "A" reference and call
> > CoFreeUnUsedLibraries() so that "A" is unloaded.
> > Step2)Add "B" to DLLHOST using Component services asministrative tool
> > Step3)create a client application which creates component "B" anc calls
> > CreateMe() so that "A" is also created.Add another button to call
KillMe()
> > of "B".
> > Step4)Open "A" in devenv. and attach to the DLLHOST(make sure dbgproxy
is
> > running..as we are debugging Native C++ applicatipn to start this use
net
> > start dgbproxy.exe from .NET command prompt).Now you can debugger
loading
> > systems dll's and custom dlls in the output box..Now open Process
> > explorer(tool from sysinternals.com) and select teh View Handles option
> > from View menu..A.dll FILE handle is present here.
> > Step5)Detach "A" from DLLHOST
> > Step6)Now click on the button of the client application which calls
> > KillMe() of "B".Now the "A" DLL is unloaded. BUT Still the FILE
reference
> > for "A" exists under DLLHOST
> >
> > Any suggestions are welcome.
> >
> >
> > Regards,
> > Ramesh
> Seems to me that what is happening is that resources are simply not
released
> as you expect, but that possibly the GC is involved. The resources will be
> eventually returned. However, if you wait, say about sometime, and the
> resources are not released, I suspect that you found a bonafined leak.
>

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