thread concurrent file operation

[Valdis.Kletnieks at vt.edu]

On Tue, 29 Jan 2013 16:56:02 +0100, Tobias Boege said:

> Look some lines above:
>
> 	struct fd f = fdget(fd);

That creates a reference, not a lock.  It basically assures that
the system doesn't reap and reclaim that fd out from under the code.
(In other words, it's managing lifetime, not concurrency).
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