bzr too slow

[Aaron Bentley]

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Robert Collins wrote:
| +        result = self.branch.unlock()
| +        if self.branch._lock is None:
| +            if self._hashcache.needs_write:
| +                self._hashcache.write()
| +        return result
|
|
| Which is completely trivial and does not depend on the transaction layer
| at all - transactions are a higher level consideration than this I
| think.

Hmm.  True.  I had imagined the race between branch._unlock and
hashcache.write was a problem, but this data, by its nature, can never
be wrong, just old.

Aaron
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