[issue12456] Hangs in concurrent.futures

[Ross Lagerwall]

Ross Lagerwall <rosslagerwall at gmail.com> added the comment:

Further analysis seems to indicate that it is a race between the shutdown code and the processes finishing.

This code hangs:
"""
executor = concurrent.futures.ProcessPoolExecutor(2)
executor.map(is_prime, [1, 2])
executor.shutdown()
"""

while this doesn't:
"""
executor = concurrent.futures.ProcessPoolExecutor(2)
executor.map(is_prime, [1, 2])
time.sleep(1)
executor.shutdown()
"""

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12456>
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