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timeval: use CLOCK_MONOTONIC_RAW if available #11291

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timeval: use CLOCK_MONOTONIC_RAW if available #11291

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@bagder bagder commented Jun 9, 2023

Reported-by: Harry Sintonen
Ref: #11288

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timeval: use CLOCK_MONOTONIC_RAW if available
2eb9858 
Reported-by: Harry Sintonen
Ref: #11288
@bagder bagder mentioned this pull request Jun 9, 2023
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dfandrich
dfandrich reviewed Jun 9, 2023
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Theoretically, CLOCK_MONOTONIC_RAW could exist and be found by autoconf but the system call could fail, while CLOCK_MONOTONIC would succeed. On Linux, this would happen if run on really old kernels (like 2.6.27) so it's probably not worth worrying about there, but what other systems support CLOCK_MONOTONIC_RAW? If there are others, or there could be others in the future, it might be worth calling both, with CLOCK_MONOTONIC only if CLOCK_MONOTONIC_RAW fails.

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bagder commented Jun 9, 2023

macOS supports CLOCK_MONOTONIC_RAW. I don't know since which version...

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bagder commented Jun 10, 2023

Theoretically, CLOCK_MONOTONIC_RAW could exist and be found by autoconf but the system call could fail, while CLOCK_MONOTONIC would succeed

What weirdness would cause that to happen?

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dfandrich commented Jun 10, 2023 via email

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bagder commented Jun 12, 2023

@dfandrich what do you think of this approach?

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Looks good to me. This should work fine now even on old (possibly ancient?) systems.

@bagder bagder closed this in c92b722 Jun 12, 2023
@bagder bagder deleted the bagder/monotonic-raw branch June 12, 2023 22:03
bch pushed a commit to bch/curl that referenced this pull request Jul 19, 2023
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timeval: use CLOCK_MONOTONIC_RAW if available
5a163fe 
Reported-by: Harry Sintonen
Ref: curl#11288
Closes curl#11291
ptitSeb pushed a commit to wasix-org/curl that referenced this pull request Sep 25, 2023
@bagder @ptitSeb
timeval: use CLOCK_MONOTONIC_RAW if available
b64921b 
Reported-by: Harry Sintonen
Ref: curl#11288
Closes curl#11291
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