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41 lines
1.7 KiB
41 lines
1.7 KiB
2 years ago
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diff --git a/Lib/threading.py b/Lib/threading.py
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index 7ab9ad8..dcedd3b 100644
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--- a/Lib/threading.py
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+++ b/Lib/threading.py
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@@ -3,7 +3,7 @@
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import sys as _sys
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import _thread
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-from time import monotonic as _time
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+from time import monotonic as _time, sleep as _sleep
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from traceback import format_exc as _format_exc
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from _weakrefset import WeakSet
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from itertools import islice as _islice, count as _count
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@@ -296,7 +296,25 @@ class Condition:
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gotit = True
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else:
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if timeout > 0:
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- gotit = waiter.acquire(True, timeout)
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+ # rhbz#2003758: Avoid waiter.acquire(True, timeout) since
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+ # it uses the system clock internally.
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+ #
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+ # Balancing act: We can't afford a pure busy loop, so we
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+ # have to sleep; but if we sleep the whole timeout time,
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+ # we'll be unresponsive. The scheme here sleeps very
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+ # little at first, longer as time goes on, but never longer
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+ # than 20 times per second (or the timeout time remaining).
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+ endtime = _time() + timeout
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+ delay = 0.0005 # 500 us -> initial delay of 1 ms
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+ while True:
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+ gotit = waiter.acquire(0)
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+ if gotit:
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+ break
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+ remaining = min(endtime - _time(), timeout)
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+ if remaining <= 0:
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+ break
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+ delay = min(delay * 2, remaining, .05)
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+ _sleep(delay)
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else:
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gotit = waiter.acquire(False)
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return gotit
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