lock free dirstate - prototype

[Robert Collins]

On Wed, 2009-09-30 at 08:33 +0300, Alexander Belchenko wrote:
> Robert Collins пишет:
> > On Tue, 2009-09-29 at 14:25 +0100, Martin Pool wrote:
> > Unlinking of files - on win32 a reader prevents unlinking of a file that
> > its reading. That means we have to unlink at some arbitrary later time
> > than the point where the file stopped being logically interesting.
> 
> It's not quite true. Using Win32 API you can have file opened to read but in the same time allowed
> to delete by another process. Mercurial has implementation of this, btw.

You mean via FILE_SHARE_DELETE ?... been a while. Ah yes, I see. That
would cause the last person closing to have the OS remove the file, and
prevent others from opening or replacing it.

So, this is something we would benefit from. How much code is needed to
get this going?

-Rob
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