[New-bugs-announce] [issue42188] forkserver not reused in child processes

[Colin]

New submission from Colin <cjphlo94 at gmail.com>:

The docstring on Forkserver.ensure_running states that a child process will use the forkserver process started by its parent:

"""
Make sure that a fork server is running.

This can be called from any process.  Note that usually a child
process will just reuse the forkserver started by its parent, so
ensure_running() will do nothing.
"""

Link to definition: https://github.com/python/cpython/blob/master/Lib/multiprocessing/forkserver.py#L105

That is not the behavior that I am seeing, however. I'm seeing each child (that start a process itself) will first spawn a *new* forkserver.

----------
components: Library (Lib)
files: test.py
messages: 379851
nosy: cchomey
priority: normal
severity: normal
status: open
title: forkserver not reused in child processes
type: behavior
versions: Python 3.8
Added file: https://bugs.python.org/file49547/test.py

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<https://bugs.python.org/issue42188>
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