sqlite connection caching not threadsafe

[Robert Collins]

Opening the same branch twice in two different threads raises a SQLite
error about not using the same object in two threads.

e.g. in thread1 do:
b = Branch.open('svn://...')
del b

and then (not concurrently) in thread2 do the same thing the exception
is raised.

 affects bzr-svn

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[Robert Collins (lifeless)]

On Fri, 2008-12-05 at 05:27 +0000, Jelmer Vernooij wrote:
> *** This bug is a duplicate of bug 185200 ***
> https://bugs.launchpad.net/bugs/185200
>
> ** This bug has been marked a duplicate of bug 185200
> "database is locked" bzr internal error

Its not a db is locked error; its a sqlite binding error to do with
thread safety. I've put up a branch that fixes it even, and it will not
fix the db is locked issue, which is separate.

-Rob

GPG key available at: <http://www.robertcollins.net/keys.txt>.