8000 gh-129205: Update multiprocessing.forkserver to use os.readinto by cmaloney · Pull Request #129425 · python/cpython · GitHub
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gh-129205: Update multiprocessing.forkserver to use os.readinto #129425

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Merged
merged 6 commits into from
Jan 30, 2025
Merged

gh-129205: Update multiprocessing.forkserver to use os.readinto #129425

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4f452fe
gh-129205: Update multiprocessing.forkserver to use os.readinto
cmaloney Jan 29, 2025
d2d5baf
Update 2025-01-28-22-11-41.gh-issue-129205.C-vE8S.rst
cmaloney Jan 29, 2025
9227d4e
Rework loop to only use one read in got it all case
cmaloney Jan 29, 2025
4409ae3
Work in positives
cmaloney Jan 29, 2025
3ef05ba
Rely on memoryview to track length, reduce temporaries
cmaloney Jan 29, 2025
22e6821
Remove news
cmaloney Jan 30, 2025
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Rely on memoryview to track length, reduce temporaries
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@cmaloney
cmaloney committed Jan 29, 2025
commit 3ef05bad4d8f2e1817177a1440b74d6ec7115092
8 changes: 4 additions & 4 deletions Lib/multiprocessing/forkserver.py
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Original file line number Diff line number Diff line change
Expand Up @@ -383,12 +383,12 @@ def _serve_one(child_r, fds, unused_fds, handlers):

def read_signed(fd):
data = bytearray(SIGNED_STRUCT.size)
bytes_read = 0
while bytes_read < SIGNED_STRUCT.size:
count = os.readinto(fd, memoryview(data)[bytes_read:])
unread = memoryview(data)
while unread:
count = os.readinto(fd, unread)
if count == 0:
raise EOFError('unexpected EOF')
bytes_read += count
unread = unread[count:]

return SIGNED_STRUCT.unpack(data)[0]

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