gh-108277: Add wrapper for timerfd_create, timerfd_settime, and timerfd_gettime to os module by m-tmatma · Pull Request #108382 · python/cpython · GitHub

Add wrapper for timerfd system calls.

Issue: Add wrapper for timerfd_create, timerfd_settime, and timerfd_gettime to os module #108277

Note: local test

python3 Tools/clinic/clinic.py -f Modules/posixmodule.c &&  \
autoconf -i && \
./configure && \
make regen-configure && \
make -j4 regen-all   && \
make regen-stdlib-module-names &&  \
make test TESTOPTS="-v test_os" && \
make -C Doc venv && make -C Doc html

📚 Documentation preview 📚: https://cpython-previews--108382.org.readthedocs.build/

In general LGTM, but we must first discuss what exactly we want to get.

Please add also an entry in the What's New file.

…ttime, and timerfd_gettime to 'os' module.

Just a heads-up, @m-tmatma: please don't force-push; instead, git merge --no-ff main. It makes for a better review experience, since both CI runs and comments can be tied to specific commits.

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

@erlend-aasland

Just a heads-up, @m-tmatma: please don't force-push; instead, git merge --no-ff main. It makes for a better review experience, since both CI runs and comments can be tied to specific commits.

Sorry, I thought force-push is a manner to contribute.

@serhiy-storchaka

Please add also an entry in the What's New file.

Added.

LGTM. Thanks for all updates!

IMO using _PyTime_t API and passing the rounding method from the time module is the right way to handle rounding.

I merged your PR, thanks @m-tmatma for your great work!

Some remarks:

The PR got reviewed by multiple core devs.
IMO os.rst doc should have a link to the HOWTO: please propose a follow-up PR for that.
I like the API with only 1 positional-only parameter, and then keyword-only arguments: we need more APIs like that :-)
I'm scared by the size of the change, the size of the API, but I'm reassured by the length of the documentation and the length of the tests. Thanks for writing all of that!
I also merged this PR because it has too many comments, too many commits. It became really hard to track it :-) I merge it to have a "starting point". Later, we can obviously enhance doc/implementation/tests/whatever.

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 RHEL7 3.x has failed when building commit de2a403.

What do you need to do:

Don't panic.
Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/15/builds/5889) and take a look at the build logs.
Check if the failure is related to this commit (de2a403) or if it is a false positive.
If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/15/builds/5889

Failed tests:

test_os

Failed subtests:

test_timerfd_negative - test.test_os.TimerfdTests.test_timerfd_negative

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-x86_64/build/Lib/test/test_os.py", line 3987, in test_timerfd_negative
    for flags in (0, os.TFD_TIMER_ABSTIME, os.TFD_TIMER_ABSTIME|os.TFD_TIMER_CANCEL_ON_SET):
                                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'os' has no attribute 'TFD_TIMER_CANCEL_ON_SET'

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL7 3.x has failed when building commit de2a403.

What do you need to do:

Don't panic.
Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/179/builds/5673) and take a look at the build logs.
Check if the failure is related to this commit (de2a403) or if it is a false positive.
If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/179/builds/5673

Failed tests:

test_os

Failed subtests:

test_timerfd_negative - test.test_os.TimerfdTests.test_timerfd_negative

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel-z/build/Lib/test/test_os.py", line 3987, in test_timerfd_negative
    for flags in (0, os.TFD_TIMER_ABSTIME, os.TFD_TIMER_ABSTIME|os.TFD_TIMER_CANCEL_ON_SET):
                                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'os' has no attribute 'TFD_TIMER_CANCEL_ON_SET'

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL7 LTO + PGO 3.x has failed when building commit de2a403.

What do you need to do:

Don't panic.
Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/244/builds/5632) and take a look at the build logs.
Check if the failure is related to this commit (de2a403) or if it is a false positive.
If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/244/builds/5632

Failed tests:

test_os

Failed subtests:

test_timerfd_negative - test.test_os.TimerfdTests.test_timerfd_negative

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel-z.lto-pgo/build/Lib/test/test_os.py", line 3987, in test_timerfd_negative
    for flags in (0, os.TFD_TIMER_ABSTIME, os.TFD_TIMER_ABSTIME|os.TFD_TIMER_CANCEL_ON_SET):
                                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'os' has no attribute 'TFD_TIMER_CANCEL_ON_SET'

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL7 LTO 3.x has failed when building commit de2a403.

What do you need to do:

Don't panic.
Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/402/builds/5581) and take a look at the build logs.
Check if the failure is related to this commit (de2a403) or if it is a false positive.
If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/402/builds/5581

Failed tests:

test_os

Failed subtests:

test_timerfd_negative - test.test_os.TimerfdTests.test_timerfd_negative

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel-z.lto/build/Lib/test/test_os.py", line 3987, in test_timerfd_negative
    for flags in (0, os.TFD_TIMER_ABSTIME, os.TFD_TIMER_ABSTIME|os.TFD_TIMER_CANCEL_ON_SET):
                                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'os' has no attribute 'TFD_TIMER_CANCEL_ON_SET'

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Ubuntu Shared 3.x has failed when building commit de2a403.

What do you need to do:

Don't panic.
Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/506/builds/6080) and take a look at the build logs.
Check if the failure is related to this commit (de2a403) or if it is a false positive.
If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/506/builds/6080

Failed tests:

test_os

Failed subtests:

test_timerfd_ns_TFD_TIMER_ABSTIME - test.test_os.TimerfdTests.test_timerfd_ns_TFD_TIMER_ABSTIME

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/test_os.py", line 4211, in test_timerfd_ns_TFD_TIMER_ABSTIME
    self.assertGreater(t, offset_ns)
AssertionError: 999978637 not greater than 1000000000

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x Fedora Clang 3.x has failed when building commit de2a403.

What do you need to do:

Don't panic.
Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/3/builds/4767) and take a look at the build logs.
Check if the failure is related to this commit (de2a403) or if it is a false positive.
If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/3/builds/4767

Failed tests:

test_os

Failed subtests:

test_timerfd_ns_TFD_TIMER_ABSTIME - test.test_os.TimerfdTests.test_timerfd_ns_TFD_TIMER_ABSTIME
test_timerfd_TFD_TIMER_ABSTIME - test.test_os.TimerfdTests.test_timerfd_TFD_TIMER_ABSTIME

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/test/test_os.py", line 4211, in test_timerfd_ns_TFD_TIMER_ABSTIME
    self.assertGreater(t, offset_ns)
AssertionError: 999998128 not greater than 1000000000


Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/test/test_os.py", line 4058, in test_timerfd_TFD_TIMER_ABSTIME
    self.assertGreater(t, offset)
AssertionError: 0.9999921415001154 not greater than 1

@vstinner
Thank you for merging.

@m-tmatma: Now you can enjoy the great pleasure of having to fix test failures :-) Look at previous comments from buildbots.

======================================================================
FAIL: test_timerfd_TFD_TIMER_ABSTIME (test.test_os.TimerfdTests.test_timerfd_TFD_TIMER_ABSTIME)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/test/test_os.py", line 4058, in test_timerfd_TFD_TIMER_ABSTIME
    self.assertGreater(t, offset)
AssertionError: 0.9999921415001154 not greater than 1

======================================================================
FAIL: test_timerfd_ns_TFD_TIMER_ABSTIME (test.test_os.TimerfdTests.test_timerfd_ns_TFD_TIMER_ABSTIME)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/test/test_os.py", line 4211, in test_timerfd_ns_TFD_TIMER_ABSTIME
    self.assertGreater(t, offset_ns)
AssertionError: 999998128 not greater than 1000000000

@vstinner
sorry, but I'm going to travel. so it takes a week to start fixing.

@vstinner
I didn't notice these failures until the PR
was merged.

Some tests are only run only on main branch?

There were some difficulties when I had developed this feature because actions was not enabled on feature branches.

I think all actions jobs should be run on feature branches or at least PRs to prevent the case on the PR.

@vstinner: I didn't notice these failures until the PR was merged.

It's because buildbots are not run before a PR is actually merged, until someone asks explicitly to run buildbots on a PR, which wasn't done.

It's ok. I may have a look at these failures and try to fix them.

On AMD64 RHEL7 3.x, test_timerfd_negative() fails because os.TFD_TIMER_CANCEL_ON_SET doesn't exist. test.pythoninfo:

os.uname: posix.uname_result(sysname='Linux', nodename='python-builder-rhel7.osci.io', release='3.10.0-1160.95.1.el7.x86_64', version='#1 SMP Fri Jun 23 08:44:55 EDT 2023', machine='x86_64')
platform.architecture: 64bit ELF
platform.freedesktop_os_release[ID]: rhel
platform.freedesktop_os_release[NAME]: Red Hat Enterprise Linux Server
platform.freedesktop_os_release[VARIANT_ID]: server
platform.freedesktop_os_release[VERSION]: 7.9 (Maipo)
platform.freedesktop_os_release[VERSION_ID]: 7.9
platform.libc_ver: glibc 2.17
platform.platform: Linux-3.10.0-1160.95.1.el7.x86_64-x86_64-with-glibc2.17

AMD64 Ubuntu Shared 3.x: https://buildbot.python.org/all/#/builders/506/builds/6080

FAIL: test_timerfd_ns_TFD_TIMER_ABSTIME (test.test_os.TimerfdTests.test_timerfd_ns_TFD_TIMER_ABSTIME)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/test_os.py", line 4211, in test_timerfd_ns_TFD_TIMER_ABSTIME
    self.assertGreater(t, offset_ns)
AssertionError: 999978637 not greater than 1000000000

I wrote PR #110515 to fix tests.

@vstinner
Thank you for the PR.

It seems like buildbots are happy, good. Refleaks will run with the fix this night.

Add wrapper for timerfd_create, timerfd_settime, and timerfd_gettime to os module. Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com> Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com> Co-authored-by: Victor Stinner <vstinner@python.org>

m-tmatma requested review from corona10 and erlend-aasland as code owners August 23, 2023 21:54

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bedevere-bot mentioned this pull request Aug 23, 2023

Add wrapper for timerfd_create, timerfd_settime, and timerfd_gettime to os module #108277

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bedevere-bot added the awaiting review label Aug 23, 2023

m-tmatma force-pushed the feature/os.timerfd_xxx branch from dbf9c7a to 5ecbf20 Compare August 23, 2023 21:55

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m-tmatma force-pushed the feature/os.timerfd_xxx branch from 5ecbf20 to c192e22 Compare August 23, 2023 21:57

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m-tmatma force-pushed the feature/os.timerfd_xxx branch 5 times, most recently from 61a9908 to ebd989f Compare August 26, 2023 09:34

serhiy-storchaka reviewed Aug 28, 2023

View reviewed changes

Comment thread Doc/library/os.rst Outdated

Comment thread Modules/posixmodule.c

erlend-aasland reviewed Aug 28, 2023

View reviewed changes

Comment thread Modules/posixmodule.c Outdated

m-tmatma and others added 3 commits August 28, 2023 18:28

pythongh-108277 : Add wrapper functions for timerfd_create, timerfd_se…

0f8aaf5

…ttime, and timerfd_gettime to 'os' module.

📜🤖 Added by blurb_it.

208fd58

fix lint error

37f70cd

m-tmatma force-pushed the feature/os.timerfd_xxx branch from ebd989f to 37f70cd Compare August 28, 2023 09:28

fix typo in doc

6f63cf7

m-tmatma and others added 3 commits August 28, 2023 18:31

Update Modules/posixmodule.c

0f47920

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

re-run Tools/clinic/clinic.py

03f319d

define HAVE_TIMERFD_API only

b8e39f2

update What's New file

44b3ac7

vstinner reviewed Oct 5, 2023

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Comment thread Lib/test/test_os.py

vstinner reviewed Oct 5, 2023

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Comment thread Python/pytime.c Outdated

m-tmatma added 5 commits October 7, 2023 08:25

Merge branch 'main' into feature/os.timerfd_xxx

ccaf48d

move common code to a utility function

b334a73

add rounding parameter to _PyTime_FromSecondsDouble

265ea56

Merge branch 'main' into feature/os.timerfd_xxx

945ef3c

replace HAVE_TIMERFD_API with HAVE_TIMERFD_CREATE

6eefda5

vstinner approved these changes Oct 7, 2023

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vstinner merged commit de2a403 into python:main Oct 7, 2023

bedevere-app Bot removed the awaiting core review label Oct 7, 2023

m-tmatma deleted the feature/os.timerfd_xxx branch October 7, 2023 20:55

vstinner mentioned this pull request Oct 11, 2023

test_os.TimerfdTests fails on FreeBSD 14 and 15: missing select.epoll() #110697

Closed

gh-108277: Add wrapper for timerfd_create, timerfd_settime, and timerfd_gettime to os module by m-tmatma · Pull Request #108382 · python/cpython · GitHub

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gh-108277: Add wrapper for timerfd_create, timerfd_settime, and timerfd_gettime to os module - #108382

gh-108277: Add wrapper for timerfd_create, timerfd_settime, and timerfd_gettime to os module#108382vstinner merged 170 commits intopython:mainpython/cpython:mainfrom m-tmatma:feature/os.timerfd_xxxm-tmatma/cpython:feature/os.timerfd_xxxCopy head branch name to clipboard

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gh-108277: Add wrapper for timerfd_create, timerfd_settime, and timerfd_gettime to os module#108382
vstinner merged 170 commits into
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m-tmatma:feature/os.timerfd_xxx

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