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bpo-20369: concurrent.futures.wait() now deduplicates futures given a… (GH-30168)

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* bpo-20369: concurrent.futures.wait() now deduplicates futures given as arg.

* 📜🤖 Added by blurb_it.

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
This commit is contained in:
Kumar Aditya 2022-01-04 19:06:13 +05:30 • committed by GitHub
parent b949845b36
commit 7d7817cf0f
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4 changed files with 18 additions and 7 deletions
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13
Lib/concurrent/futures/_base.py
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@ -282,13 +282,14 @@ def wait(fs, timeout=None, return_when=ALL_COMPLETED):
A named 2-tuple of sets. The first set, named 'done', contains the
futures that completed (is finished or cancelled) before the wait
completed. The second set, named 'not_done', contains uncompleted
futures.
futures. Duplicate futures given to *fs* are removed and will be
returned only once.
"""
fs = set(fs)
with _AcquireFutures(fs):
done = set(f for f in fs
if f._state in [CANCELLED_AND_NOTIFIED, FINISHED])
not_done = set(fs) - done
done = {f for f in fs
if f._state in [CANCELLED_AND_NOTIFIED, FINISHED]}
not_done = fs - done
if (return_when == FIRST_COMPLETED) and done:
return DoneAndNotDoneFutures(done, not_done)
elif (return_when == FIRST_EXCEPTION) and done:
@ -307,7 +308,7 @@ def wait(fs, timeout=None, return_when=ALL_COMPLETED):
f._waiters.remove(waiter)
done.update(waiter.finished_futures)
return DoneAndNotDoneFutures(done, set(fs) - done)
return DoneAndNotDoneFutures(done, fs - done)
class Future(object):
"""Represents the result of an asynchronous computation."""