mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
853b6c3864
- Wrap clock_getres() - Wrap sched_setscheduler() - Make sleep() api conformant - Polyfill sleep() using select() - Improve clock_gettime() polyfill - Make nanosleep() POSIX conformant - Slightly improve some DNS functions - Further strengthen pledge() sandboxing - Improve rounding of timeval / timespec - Allow layering of pledge() calls on Linux - Polyfill sched_yield() using select() on XNU - Delete more system constants we probably don't need
60 lines
2.9 KiB
C
60 lines
2.9 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 2022 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/bits/likely.h"
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#include "libc/calls/clock_gettime.internal.h"
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#include "libc/intrin/spinlock.h"
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#include "libc/nexgen32e/rdtsc.h"
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#include "libc/nexgen32e/threaded.h"
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#include "libc/nexgen32e/x86feature.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/time/clockstonanos.internal.h"
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#include "libc/time/time.h"
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static struct {
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bool once;
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char lock;
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uint64_t base;
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struct timespec mono;
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} g_mono;
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int sys_clock_gettime_mono(struct timespec *ts) {
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// this routine stops being monotonic after 194 years of uptime
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uint64_t nanos;
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struct timespec res;
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if (X86_HAVE(INVTSC)) {
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if (__threaded) {
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_spinlock(&g_mono.lock);
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}
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if (UNLIKELY(!g_mono.once)) {
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clock_gettime(CLOCK_REALTIME, &g_mono.mono);
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g_mono.base = rdtsc();
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g_mono.once = true;
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}
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nanos = ClocksToNanos(rdtsc(), g_mono.base);
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res = g_mono.mono;
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res.tv_sec += nanos / 1000000000;
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res.tv_nsec += nanos % 1000000000;
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_spunlock(&g_mono.lock);
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*ts = res;
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return 0;
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} else {
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return einval();
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}
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}
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