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Diffstat (limited to 'Doc/library/concurrent.futures.rst')
| -rw-r--r-- | Doc/library/concurrent.futures.rst | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Doc/library/concurrent.futures.rst b/Doc/library/concurrent.futures.rst index 2359dd1ad0..f401f93961 100644 --- a/Doc/library/concurrent.futures.rst +++ b/Doc/library/concurrent.futures.rst @@ -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 + |