[PATCH] Singleton Branches

[Aaron Bentley]

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John Arbash Meinel wrote:
| It is very easy in code to have multiple requests for the same branch
| object without realizing it. Because the filesystem is sometimes the
| point of coordination, not the python code. Two portions of code saying
| give me information about this file will probably have to allocate a
| branch object to get it.
|
| I only really need a singleton Lock object, though it seemed reasonable
| to put that in the Branch object.

If you put it in the Branch object, then when the lock is write-locked,
attempts to acquire the Branch must raise an exception.  And when it's
read-locked, attempts to unlock the branch must raise an exception if
the Branch is referenced in more than one place.

Is that really the kind of thing you want?

Aaron
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