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The wrong assumption that the GIL combined with CPython's "mostly"
thread safe assurance does not hold. The combination of a slow
event handler for notification and calling the API at the same
time let to contention on the results data structure.
Added suitable locking.
Also added an atexit() to attempt a VPP disconnect on shutdown.
Also: lots more comments, docstrings, duplicated code removed.
Some of the problem here was a disagreement between caller
and author as to how the API should be used; the comments should
help.
Change-Id: I0cb7d0026db660ec141425c5ad474f14bacea36e
Signed-off-by: Ole Troan <ot@cisco.com>
Co-Authored-By: Ian Wells <iawells@cisco.com>
Signed-off-by: Ole Troan <ot@cisco.com>
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