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cosmopolitan/libc/nt/time.h

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Implement proper time zone support Cosmopolitan now supports 104 time zones. They're embedded inside any binary that links the localtime() function. Doing so adds about 100kb to the binary size. This change also gets time zones working properly on Windows for the first time. It's not needed to have /etc/localtime exist on Windows, since we can get this information from WIN32. We're also now updated to the latest version of Paul Eggert's TZ library.
2024-05-05 06:05:36 +00:00
#ifndef COSMOPOLITAN_LIBC_NT_TIME_H_
#define COSMOPOLITAN_LIBC_NT_TIME_H_
#include "libc/nt/struct/dynamictimezoneinformation.h"
#include "libc/nt/struct/timezoneinformation.h"
COSMOPOLITAN_C_START_
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│ cosmopolitan § new technology » time ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
uint32_t GetTimeZoneInformation(
struct NtTimeZoneInformation *out_lpTimeZoneInformation);
uint32_t GetDynamicTimeZoneInformation(
struct NtDynamicTimeZoneInformation *out_lpTimeZoneInformation);
Delve into clock rabbit hole 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.
2024-09-04 07:38:44 +00:00
bool32 QueryInterruptTime(uint64_t *); /* Windows 10+ */
bool32 QueryInterruptTimePrecise(uint64_t *); /* Windows 10+ */
bool32 QueryUnbiasedInterruptTime(uint64_t *); /* Windows 7+ */
bool32 QueryUnbiasedInterruptTimePrecise(uint64_t *); /* Windows 10+ */
Implement proper time zone support Cosmopolitan now supports 104 time zones. They're embedded inside any binary that links the localtime() function. Doing so adds about 100kb to the binary size. This change also gets time zones working properly on Windows for the first time. It's not needed to have /etc/localtime exist on Windows, since we can get this information from WIN32. We're also now updated to the latest version of Paul Eggert's TZ library.
2024-05-05 06:05:36 +00:00
COSMOPOLITAN_C_END_
#endif /* COSMOPOLITAN_LIBC_NT_TIME_H_ */
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