sqlite3: bug with monotone
Warren Young
warren@etr-usa.com
Fri May 31 21:11:00 GMT 2013
On 5/31/2013 13:58, Warren Young wrote:
>
> The SQLite code prefers POSIX advisory locks, but it can fall back to
> BSD locks if it has to.
Just to clarify, when I say "POSIX locks" I always mean new style
fcntl() locks. There are no calls to lockf() in sqlite3.c.
> I'm not sure why it doesn't just
> blindly try the lock.
On reflection, I'm sure it has something to do with maintaining high
concurrency. If it knows its near-future DB file write is going to get
blocked, it can choose to do something else while the existing DB lock
holders finish.
By contrast, SQLite's flock() based locking is documented as being much
more brute-force, resulting in much lower concurrency.
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