Gregory P. Smith <[email protected]> added the comment:
As a note on the general pattern, a user at work diagnosed a ^C problem in
their code when running on 2.7 to be due to Queue.get's
acquire()
try:
...
finally:
release()
Pattern, with the KeyboardInterrupt triggering after acquire() but before the
try is entered. so release() is never called.
A try finally pattern that probably alleviates this by entering the try block
first might look like:
try:
acquire()
...
finally:
try:
release()
except ThreadError:
pass # interrupted before acquire() succeeded.
It'd be a shame if any with statements lock acquisition context managers need
to be turned into that, but I _believe_ it'd be a viable workaround for the
time being if this race is found to be biting anyone.
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<https://bugs.python.org/issue29988>
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