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Diffstat (limited to 'Doc/library/concurrent.futures.rst')
| -rw-r--r-- | Doc/library/concurrent.futures.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Doc/library/concurrent.futures.rst b/Doc/library/concurrent.futures.rst index c2f92b305a..93538e4a73 100644 --- a/Doc/library/concurrent.futures.rst +++ b/Doc/library/concurrent.futures.rst @@ -164,6 +164,9 @@ uses a pool of processes to execute calls asynchronously. allows it to side-step the :term:`Global Interpreter Lock` but also means that only picklable objects can be executed and returned. +The ``__main__`` module must be importable by worker subprocesses. This means +that :class:`ProcessPoolExecutor` will not work in the interactive interpreter. + Calling :class:`Executor` or :class:`Future` methods from a callable submitted to a :class:`ProcessPoolExecutor` will result in deadlock. |