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gh-105331: Fix asyncio.sleep() bug by weijay0804 · Pull Request #105513 · python/cpython · GitHub

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gh-105331: Fix asyncio.sleep() bug #105513

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gh-105331: Fix asyncio.sleep() bug #105513

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gh-105331: Fix asyncio.sleep() bug
weijay0804 Jun 8, 2023
8ea9e42
📜🤖 Added by blurb_it.
blurb-it[bot] Jun 8, 2023
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27 changes: 26 additions & 1 deletion Lib/asyncio/tasks.py
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Original file line number Diff line number Diff line change
Expand Up @@ -640,9 +640,34 @@ def __sleep0():
yield


def _check_delay(delay):
"""Check if the value of 'delay' is valid."""

import sys
import math

SEC_TO_NS = 1000 * 1000 * 1000

if not isinstance(delay, (int, float)):
raise TypeError(f"{type(delay)} object cannot be interpreted as an integer")

# According to Modules/timemodule.c
if (delay > sys.maxsize / SEC_TO_NS):

Eclips4 Jun 8, 2023 •
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

It is incorrect because of 32-bit platform (and that's why asyncio test failing on Windows 32-bit).
sys.maxsize on 32-bit platform equal to 2 ** 31 -1.
So, in that case sys.maxsize / SEC_TO_NS is equal to 2.147483647

weijay0804 Jun 8, 2023

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Oh!
I forgot about this matter.
In timemodule.c, INT64_MAX is used and is not subject to the limitation of 32-bit.
If I write it as INT64_MAX = 2**64 - 1, how would it be?

if (delay > INT64_MAX / SEC_TO_NS)

Eclips4 Jun 9, 2023

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Oh! I forgot about this matter. In timemodule.c, INT64_MAX is used and is not subject to the limitation of 32-bit. If I write it as INT64_MAX = 2**64 - 1, how would it be?

if (delay > INT64_MAX / SEC_TO_NS)

I think it's correct solution, but I'm not expert in this area. Let's wait for other opinions
raise OverflowError("timestamp too large to convert to C _PyTime_t")

if (delay < 0):
raise ValueError("sleep length must be non-negative")

if (math.isnan(delay)):

Eclips4 Jun 8, 2023

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Also, seems there need to add check that delay is finite number. Use something like if not math.isfinite(delay): ... for resolve that.

weijay0804 Jun 8, 2023

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This appears to be more accurate.

Thank you!
raise ValueError("Invalid value NaN (not a number)")


async def sleep(delay, result=None):
"""Coroutine that completes after a given time (in seconds)."""
if delay <= 0:

_check_delay(delay)

if delay == 0:
await __sleep0()
return result

Expand Down
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core and Builtins/2023-06-08-16-29-43.gh-issue-105513.M7ueoq.rst
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@@ -0,0 +1 @@
fix asyncio.sleep(float('nan')) does not raise ValueError bug
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