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| author | Gregory P. Smith <greg@krypto.org> | 2022-05-06 07:04:53 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-05-06 07:04:53 (GMT) |
| commit | fa4f0a134e7911b2494ea9866c8a49ff446f9d6c (patch) | |
| tree | 4890fee63ed702f2b7d05f554d56c8757f6c0c4e /Doc/library/concurrent.futures.rst | |
| parent | 2b563f1ad31af0bb0a9947e6f1f76e58dbf170f0 (diff) | |
| download | cpython-fa4f0a134e7911b2494ea9866c8a49ff446f9d6c.zip cpython-fa4f0a134e7911b2494ea9866c8a49ff446f9d6c.tar.gz cpython-fa4f0a134e7911b2494ea9866c8a49ff446f9d6c.tar.bz2 | |
gh-90622: Prevent max_tasks_per_child use with a fork mp_context. (#91587)
Prevent `max_tasks_per_child` use with a "fork" mp_context to avoid deadlocks.
Also defaults to "spawn" when no mp_context is supplied for safe convenience.
Diffstat (limited to 'Doc/library/concurrent.futures.rst')
| -rw-r--r-- | Doc/library/concurrent.futures.rst | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/Doc/library/concurrent.futures.rst b/Doc/library/concurrent.futures.rst index 9592808..99703ff 100644 --- a/Doc/library/concurrent.futures.rst +++ b/Doc/library/concurrent.futures.rst @@ -254,8 +254,11 @@ to a :class:`ProcessPoolExecutor` will result in deadlock. *max_tasks_per_child* is an optional argument that specifies the maximum number of tasks a single process can execute before it will exit and be - replaced with a fresh worker process. The default *max_tasks_per_child* is - ``None`` which means worker processes will live as long as the pool. + replaced with a fresh worker process. By default *max_tasks_per_child* is + ``None`` which means worker processes will live as long as the pool. When + a max is specified, the "spawn" multiprocessing start method will be used by + default in absense of a *mp_context* parameter. This feature is incompatible + with the "fork" start method. .. versionchanged:: 3.3 When one of the worker processes terminates abruptly, a |