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Issue #9205: concurrent.futures.ProcessPoolExecutor now detects killed

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children and raises BrokenProcessPool in such a situation.  Previously it
would reliably freeze/deadlock.
This commit is contained in:
Antoine Pitrou 2011-06-08 17:21:55 +02:00
parent 4a5e5de03f
commit dd69649660
8 changed files with 587 additions and 107 deletions
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19
Doc/library/concurrent.futures.rst
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@ -169,6 +169,12 @@ to a :class:`ProcessPoolExecutor` will result in deadlock.
of at most *max_workers* processes. If *max_workers* is ``None`` or not
given, it will default to the number of processors on the machine.
.. versionchanged:: 3.3
When one of the worker processes terminates abruptly, a
:exc:`BrokenProcessPool` error is now raised. Previously, behaviour
was undefined but operations on the executor or its futures would often
freeze or deadlock.
.. _processpoolexecutor-example:
@ -369,3 +375,16 @@ Module Functions
:pep:`3148` -- futures - execute computations asynchronously
The proposal which described this feature for inclusion in the Python
standard library.
Exception classes
-----------------
.. exception:: BrokenProcessPool
Derived from :exc:`RuntimeError`, this exception class is raised when
one of the workers of a :class:`ProcessPoolExecutor` has terminated
in a non-clean fashion (for example, if it was killed from the outside).
.. versionadded:: 3.3