[issue16500] Allow registering at-fork handlers

[STINNER Victor]

STINNER Victor added the comment:


New changeset a15d155aadfad232158f530278505cdc6f326f93 by Victor Stinner in branch 'master':
bpo-31234: Enhance test_thread.test_forkinthread() (#3516)
https://github.com/python/cpython/commit/a15d155aadfad232158f530278505cdc6f326f93


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<https://bugs.python.org/issue16500>
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