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gh-106554: replace _BaseSelectorImpl._key_from_fd with dict.get (#106555)

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J. Nick Koston 2023-07-14 08:46:30 -10:00 committed by GitHub
parent 6a70edf24c
commit aeef8591e4
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2 changed files with 5 additions and 17 deletions
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21
Lib/selectors.py
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@ -276,19 +276,6 @@ class _BaseSelectorImpl(BaseSelector):
def get_map(self):
return self._map
def _key_from_fd(self, fd):
"""Return the key associated to a given file descriptor.
Parameters:
fd -- file descriptor
Returns:
corresponding key, or None if not found
"""
try:
return self._fd_to_key[fd]
except KeyError:
return None
class SelectSelector(_BaseSelectorImpl):
@ -336,7 +323,7 @@ class SelectSelector(_BaseSelectorImpl):
if fd in w:
events |= EVENT_WRITE
key = self._key_from_fd(fd)
key = self._fd_to_key.get(fd)
if key:
ready.append((key, events & key.events))
return ready
@ -426,7 +413,7 @@ class _PollLikeSelector(_BaseSelectorImpl):
if event & ~self._EVENT_WRITE:
events |= EVENT_READ
key = self._key_from_fd(fd)
key = self._fd_to_key.get(fd)
if key:
ready.append((key, events & key.events))
return ready
@ -479,7 +466,7 @@ if hasattr(select, 'epoll'):
if event & ~select.EPOLLOUT:
events |= EVENT_READ
key = self._key_from_fd(fd)
key = self._fd_to_key.get(fd)
if key:
ready.append((key, events & key.events))
return ready
@ -574,7 +561,7 @@ if hasattr(select, 'kqueue'):
if flag == select.KQ_FILTER_WRITE:
events |= EVENT_WRITE
key = self._key_from_fd(fd)
key = self._fd_to_key.get(fd)
if key:
ready.append((key, events & key.events))
return ready

1
Misc/NEWS.d/next/Library/2023-07-09-01-59-24.gh-issue-106554.37c53J.rst Normal file
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@ -0,0 +1 @@
:mod:`selectors`: Reduce Selector overhead by using a ``dict.get()`` to lookup file descriptors.