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bpo-21302: Add nanosleep() implementation for time.sleep() in Unix #28545

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Merged
merged 8 commits into from
Sep 25, 2021
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bpo-21302: Add nanosleep() implementation for time.sleep() in Unix #28545

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57db5a3
replace select() to nanosleep()
Livius90 Sep 22, 2021
0396b87
📜🤖 Added by blurb_it.
blurb-it[bot] Sep 22, 2021
b514260
revert some changes
Livius90 Sep 23, 2021
bd98486
Add HAVE_NANOSLEEP to configure.ac
Livius90 Sep 23, 2021
050e08e
Update news rst
Livius90 Sep 23, 2021
96eaec0
Refactor
vstinner Sep 24, 2021
2a66080
Move err assignement just after the function call
vstinner Sep 24, 2021
d519657
Update the doc
vstinner Sep 24, 2021
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Update the doc
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@vstinner
vstinner committed Sep 24, 2021
commit d51965779fdf64b1f34fb9854b3dcaf52eae19e7
16 changes: 9 additions & 7 deletions Doc/library/time.rst
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Expand Up @@ -364,16 +364,18 @@ Functions
threads ready to run, the function returns immediately, and the thread
continues execution.

Implementation:
Unix implementation:

* On Unix, ``clock_nanosleep()`` is used if available (resolution: 1 ns),
or ``select()`` is used otherwise (resolution: 1 us).
* On Windows, a waitable timer is used (resolution: 100 ns). If *secs* is
zero, ``Sleep(0)`` is used.
* Use ``clock_nanosleep()`` if available (resolution: 1 ns);
* Or use ``nanosleep()`` if available (resolution: 1 ns);
* Or use ``select()`` (resolution: 1 us).

On Windows, a waitable timer is used (resolution: 100 ns). If *secs* is
zero, ``Sleep(0)`` is used.

.. versionchanged:: 3.11
On Unix, the ``clock_nanosleep()`` function is now used if available.
On Windows, a waitable timer is now used.
On Unix, the ``clock_nanosleep()`` and ``nanosleep()`` functions are now
used if available. On Windows, a waitable timer is now used.

.. versionchanged:: 3.5
The function now sleeps at least *secs* even if the sleep is interrupted
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7 changes: 4 additions & 3 deletions Doc/whatsnew/3.11.rst
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Expand Up @@ -242,9 +242,10 @@ sqlite3
time
----

* On Unix, :func:`time.sleep` now uses the ``clock_nanosleep()`` function, if
available, which has a resolution of 1 ns (10^-6 sec), rather than using
``select()`` which has a resolution of 1 us (10^-9 sec).
* On Unix, :func:`time.sleep` now uses the ``clock_nanosleep()`` or
``nanosleep()`` function, if available, which has a resolution of 1 ns (10^-6
sec), rather than using ``select()`` which has a resolution of 1 us (10^-9
sec).
(Contributed by Livius and Victor Stinner in :issue:`21302`.)

* On Windows, :func:`time.sleep` now uses a waitable timer which has a
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