VS 2019 16.8 Preview 4, Python 3.9.0, absolute time fix - #1371
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Stephan T. Lavavej (StephanTLavavej) merged 8 commits intoOct 17, 2020
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... without overflow by saturating on the high end and clipping to `now`.
* This is a template, so we don't need inline. * Use auto for _Abs_time - its type is unsurprising. * Extract constexpr _Zero to avoid a function call in debug mode. * Similarly, upgrade _Forever to constexpr.
Stephan T. Lavavej (StephanTLavavej)
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October 14, 2020 07:40
Michael Schellenberger Costa (miscco)
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Awesome!
Thanks Matt Stephanson (@MattStephanson) and Casey Carter (@CaseyCarter)
Casey Carter (CaseyCarter)
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Curtis J Bezault (cbezault)
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Thanks again Matt Stephanson (@MattStephanson) and Casey Carter (@CaseyCarter)! 😺 |
This was referenced Oct 17, 2020
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This updates the CI infrastructure to VS 2019 16.8 Preview 4 and Python 3.9.0.
This also fixes #1365, a sporadic test failure that I encountered after upgrading my local machine to Python 3.9.0. (I'm still not sure if they're actually related, but I've bundled these changes together since they affect different files and are relatively small.) Matt Stephanson (@MattStephanson) found the root cause and Casey Carter (@CaseyCarter) developed a fix: convert relative time to absolute time, clamped between now and forever. I then made the following changes:
_To_absolute_timeup to<thread>so we can fix 3 more lines (in<thread>and<shared_mutex>)._To_absolute_timeis atemplate, so we don't needinline.now() + _Rel_time(the expression we're replacing and clamping). For example, this makes a difference when_Rel_timehas adoublerepresentation.constexpr _Zeroto avoid a function call in debug mode._Forevertoconstexpr.