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Fix errors with multiprocessing #521

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Fix errors with multiprocessing #521

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5 changes: 5 additions & 0 deletions importlib_metadata/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -802,6 +802,7 @@ class FastPath:
True
"""

# The following cache is cleared at fork, see os.register_at_fork below
@functools.lru_cache() # type: ignore[misc]
def __new__(cls, root):
return super().__new__(cls)
Expand Down Expand Up @@ -842,6 +843,10 @@ def mtime(self):
def lookup(self, mtime):
return Lookup(self)

# Clear FastPath.__new__ cache when forked, avoids trying to re-useing open
# file pointers from zipp.Path/zipfile.Path objects in forked process
os.register_at_fork(after_in_child=FastPath.__new__.cache_clear)


class Lookup:
"""
Expand Down