Sander,
Thanks, I understand it. For each vm system thread that waits for directory
change
events, we can launch a host thread.
Another way is not to use the vbox mechanism, instead, using tcp/ip
communication between host and vm, but this won't work if networking is
disabled. This is how the current windows sharing (samba) are implemented.
Huihong
--- On Tue, 7/15/08, Sander van Leeuwen <[EMAIL PROTECTED]> wrote:
From: Sander van Leeuwen <[EMAIL PROTECTED]>
Subject: Re: [vbox-dev] host calling into vm for async I/O?
To: "VirtualBox developer's list" <vbox-dev@virtualbox.org>
Cc: [EMAIL PROTECTED]
Date: Tuesday, July 15, 2008, 1:15 AM
Let me clarify this a bit more on the blocking case. Inside the guest you need
to create a (kernel) thread that calls the host HGCM service and waits for an
answer, which it will get when the host service detects a directory change. As
the host service is single threaded, you need to create a separate thread that
monitors for directory changes. That additional host thread will asynchronously
complete the HGCM service call the guest makes.
This means the HGCM service call made by the guest is not completed inside the
svcCall handler (by calling g_pHelpers->pfnCallComplete).
Sander
Sander van Leeuwen wrote:
There's is no such reversed callback mechanism for HGCM. You'd either have to
poll or make a guest thread block in a wait for directory change HGCM call. The
latter
is not that easy as an HGCM client is single threaded.
Sander
Huihong Luo wrote:
Are there any APIs that can invoke vm's functions from host (opposite to
VbglHGCMCall which does vm to host calls)?
I am trying to implement directory change notification features on windows
shared folders. Basically, when files change in a host folder, I want the host
to invoke a callback function inside vm.
Thanks,
Huihong
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Sun Microsystems GmbH Sander van Leeuwen
Werkstrasse 24 Senior Staff Engineer, VirtualBox
71384 Weinstadt, Germany mailto:[EMAIL PROTECTED]
================================================
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Kind regards / Mit freundlichen Gruessen / Met vriendelijke groet
--
Sun Microsystems GmbH Sander van Leeuwen
Werkstrasse 24 Senior Staff Engineer, VirtualBox
71384 Weinstadt, Germany mailto:[EMAIL PROTECTED]
================================================
Sitz der Gesellschaft: Sun Microsystems GmbH,
Sonnenallee 1, 85551 Kirchheim-Heimstetten
Amtsgericht Muenchen: HRB 161028
Geschaeftsfuehrer: Thomas Schroeder,
Wolfgang Engels, Dr. Roland Boehmer
Vorsitzender des Aufsichtsrates: Martin Haering
================================================
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