Ian Campbell writes ("Re: [PATCH] xenconsole: Ensure exclusive access to
console using locks"):
> I think the answer is to either not remove the lockfile
That is a bit messy (although not entirely wrong).
> or to do so _before_ dropping the lock, which makes the unlink
> itself the effective unlock point.
This is necessary but not sufficient. With only that change:
A open flock unlink close
B open flock .o{ I have the lock }
C open flock .o{ I have the lock }
B is mistaken because it olds an fd onto an unlinked file.
Ian.
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