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The worst issue I had with consts.sh for clock_gettime is how it defined too many clocks. So I looked into these clocks all day to figure out how how they overlap in functionality. I discovered counter-intuitive things such as how CLOCK_MONOTONIC should be CLOCK_UPTIME on MacOS and BSD, and that CLOCK_BOOTTIME should be CLOCK_MONOTONIC on MacOS / BSD. Windows 10 also has some incredible new APIs, that let us simplify clock_gettime(). - Linux CLOCK_REALTIME -> GetSystemTimePreciseAsFileTime() - Linux CLOCK_MONOTONIC -> QueryUnbiasedInterruptTimePrecise() - Linux CLOCK_MONOTONIC_RAW -> QueryUnbiasedInterruptTimePrecise() - Linux CLOCK_REALTIME_COARSE -> GetSystemTimeAsFileTime() - Linux CLOCK_MONOTONIC_COARSE -> QueryUnbiasedInterruptTime() - Linux CLOCK_BOOTTIME -> QueryInterruptTimePrecise() Documentation on the clock crew has been added to clock_gettime() in the docstring and in redbean's documentation too. You can read that to learn interesting facts about eight essential clocks that survived this purge. This is original research you will not find on Google, OpenAI, or Claude I've tested this change by porting *NSYNC to become fully clock agnostic since it has extensive tests for spotting irregularities in time. I have also included these tests in the default build so they no longer need to be run manually. Both CLOCK_REALTIME and CLOCK_MONOTONIC are good across the entire amd64 and arm64 test fleets.
27 lines
837 B
C
27 lines
837 B
C
#ifndef COSMOPOLITAN_LIBC_SYSV_CONSTS_CLOCK_H_
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#define COSMOPOLITAN_LIBC_SYSV_CONSTS_CLOCK_H_
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COSMOPOLITAN_C_START_
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extern int CLOCK_REALTIME_COARSE;
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extern const int CLOCK_MONOTONIC;
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extern int CLOCK_MONOTONIC_RAW;
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extern int CLOCK_MONOTONIC_COARSE;
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extern const int CLOCK_THREAD_CPUTIME_ID;
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extern const int CLOCK_PROCESS_CPUTIME_ID;
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extern const int CLOCK_BOOTTIME;
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COSMOPOLITAN_C_END_
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#define CLOCK_REALTIME 0
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#define CLOCK_REALTIME_COARSE CLOCK_REALTIME_COARSE
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#define CLOCK_MONOTONIC CLOCK_MONOTONIC
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#define CLOCK_MONOTONIC_RAW CLOCK_MONOTONIC_RAW
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#define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC_COARSE
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#define CLOCK_THREAD_CPUTIME_ID CLOCK_THREAD_CPUTIME_ID
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#define CLOCK_PROCESS_CPUTIME_ID CLOCK_PROCESS_CPUTIME_ID
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#define CLOCK_BOOTTIME CLOCK_BOOTTIME
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#endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_CLOCK_H_ */
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