[BUG] Pull command on Windows: we have 2 problems

[Aaron Bentley]

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Robert Collins wrote:
> I think thats a really bad idea.
> 
> It implies a process wide identity map for the separate lock at a
> minimum,

This is what I meant by 'keeping a global dict of LocationLocks'

 and raises IMO hairy questions - for instance, if I open a
> write lock in one instance, create a new branch instance and take a read
> lock, then close the first instances write lock and grab a new one -
> should it succeed or fail?

Since that would succeed with a single branch, it should succeed with two.

Aaron
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