Re: Locking files for CLASH_DETECTION now supported on MS-Windows

[Daniel Colascione]

On 2/25/2013 6:03 PM, Paul Eggert wrote:
> One other thought.  Part of the reason GNU/POSIXish hosts use
> symbolic links is that readlink, symlink and unlink
> are atomic operations.  They let Emacs atomically create
> a lock, test whether a lock exists, and remove a lock.  This
> doesn't seem to be true of the new MS-Windows implementation,
> which uses open+write+close to create a lock and open+read+close
> to test whether a lock exists, neither of which is atomic.
> Is there some way this can be done atomically on MS-Windows?
> 
> Are readlink, symlink, and unlink atomic on MS-Windows?

Why would they have to be? File creation is atomic. File deletion is atomic. The
lock is signaled by the presence of the file, right? Why would anything else 
matter?

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