* Dennis Cote:

> The OP said they were measuring an excess of lock calls. That would 
> imply that SQLite is locking files it has already locked. Is that 
> possible with the POSIX APIs?

SQLite uses fcntl-based locks, which keep a separate lock for each byte
in a file (or, more precisely, any byte that you can address with
off_t).  You can lock and unlock ranges, and if the sizes do not match
(which isn't a requirement), the number of calls do not need to match.
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