Investigate transmit path threading

[hardbyte]

Originally reported by: Brian Thorne (Bitbucket: hardbyte, GitHub: hardbyte)

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There is some suspicious code in can/bus.py to do with locking around the bus. This is a holdover from problems I had with the kvaiser linux sdk not wanting multiple processes doing things on the bus at the same time.

A bit of an investigation is required to see how it effects socketcan, and ideally clean up that code.

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• Bitbucket: https://bitbucket.org/hardbyte/python-can/issue/2

[hardbyte]

Original comment by Brian Thorne (Bitbucket: hardbyte, GitHub: hardbyte):

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On linux at least there isn't really any reason to spin up a thread to buffer writing to the bus. Commit 7efb722 addresses this for the general case, I think investigation into how we deal with multiple threads talking via kvaser's sdk is warranted.

[hardbyte]

Original comment by Brian Thorne (Bitbucket: hardbyte, GitHub: hardbyte):

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Closing as haven't heard anyone having troubles in over a year.