mirror of
https://github.com/jart/cosmopolitan.git
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78 lines
3.2 KiB
C
78 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/struct/timespec.h"
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#include "libc/calls/struct/timespec.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/fmt/wintime.internal.h"
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#include "libc/nt/synchronization.h"
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#define _CLOCK_REALTIME 0
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#define _CLOCK_MONOTONIC 1
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#define _CLOCK_REALTIME_COARSE 2
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#define _CLOCK_BOOTTIME 3
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static struct {
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uint64_t base;
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uint64_t freq;
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} g_winclock;
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textwindows int sys_clock_gettime_nt(int clock, struct timespec *ts) {
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uint64_t t;
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struct NtFileTime ft;
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switch (clock) {
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case _CLOCK_REALTIME:
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if (ts) {
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GetSystemTimePreciseAsFileTime(&ft);
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*ts = FileTimeToTimeSpec(ft);
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}
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return 0;
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case _CLOCK_REALTIME_COARSE:
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if (ts) {
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GetSystemTimeAsFileTime(&ft);
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*ts = FileTimeToTimeSpec(ft);
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}
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return 0;
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case _CLOCK_MONOTONIC:
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if (ts) {
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QueryPerformanceCounter(&t);
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t = ((t - g_winclock.base) * 1000000000) / g_winclock.freq;
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*ts = timespec_fromnanos(t);
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}
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return 0;
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case _CLOCK_BOOTTIME:
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if (ts) {
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*ts = timespec_frommillis(GetTickCount64());
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}
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return 0;
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default:
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return -EINVAL;
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}
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}
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static textstartup void winclock_init() {
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if (IsWindows()) {
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QueryPerformanceCounter(&g_winclock.base);
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QueryPerformanceFrequency(&g_winclock.freq);
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}
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}
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const void *const winclock_ctor[] initarray = {
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winclock_init,
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};
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