[issue23697] Module level map & submit for concurrent.futures

[Brian Quinlan]

Brian Quinlan <brian at sweetapp.com> added the comment:

Using a default executor could be dangerous because it could lead to deadlocks. For example:

mylib.py
--------

def my_func():
  tsubmit(...)
  tsubmit(...)
  tsubmit(somelib.some_func, ...)


somelib.py
----------

def some_func():
  tsubmit(...) # Potential deadlock if no more free threads.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23697>
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