mirror of
https://github.com/jart/cosmopolitan.git
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bcf9af94bf
- Now using 10x better GCD semaphores - We now generate Linux-like thread ids - We now use fast system clock / sleep libraries - The APE M1 loader now generates Linux-like stacks
113 lines
4.5 KiB
C
113 lines
4.5 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 2020 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/assert.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/struct/itimerval.internal.h"
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#include "libc/calls/struct/timeval.h"
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#include "libc/calls/struct/timeval.internal.h"
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#include "libc/calls/syscall_support-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/tls.h"
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#include "libc/time/struct/timezone.h"
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typedef axdx_t gettimeofday_f(struct timeval *, struct timezone *, void *);
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static gettimeofday_f __gettimeofday_init;
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static gettimeofday_f *__gettimeofday = __gettimeofday_init;
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/**
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* Returns system wall time in microseconds, e.g.
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*
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* int64_t t;
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* char p[30];
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* struct tm tm;
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* struct timeval tv;
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* gettimeofday(&tv, 0);
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* t = tv.tv_sec;
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* gmtime_r(&t, &tm);
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* FormatHttpDateTime(p, &tm);
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* printf("%s\n", p);
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*
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* @param tv points to timeval that receives result if non-NULL
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* @param tz receives UTC timezone if non-NULL
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* @error EFAULT if `tv` or `tz` isn't valid memory
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* @see clock_gettime() for nanosecond precision
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* @see strftime() for string formatting
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*/
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int gettimeofday(struct timeval *tv, struct timezone *tz) {
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int rc;
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axdx_t ad;
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if (IsAsan() && ((tv && !__asan_is_valid(tv, sizeof(*tv))) ||
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(tz && !__asan_is_valid(tz, sizeof(*tz))))) {
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rc = efault();
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} else {
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rc = __gettimeofday(tv, tz, 0).ax;
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}
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#if SYSDEBUG
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if (__tls_enabled && !(__get_tls()->tib_flags & TIB_FLAG_TIME_CRITICAL)) {
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STRACE("gettimeofday([%s], %p) → %d% m", DescribeTimeval(rc, tv), tz, rc);
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}
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#endif
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return rc;
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}
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/**
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* Returns pointer to fastest gettimeofday().
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*/
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gettimeofday_f *__gettimeofday_get(bool *opt_out_isfast) {
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bool isfast;
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gettimeofday_f *res;
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if (IsLinux() && (res = __vdsosym("LINUX_2.6", "__vdso_gettimeofday"))) {
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isfast = true;
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} else if (IsWindows()) {
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isfast = true;
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res = sys_gettimeofday_nt;
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} else if (IsXnu()) {
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#ifdef __x86_64__
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res = sys_gettimeofday_xnu;
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isfast = false;
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#elif defined(__aarch64__)
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res = sys_gettimeofday_m1;
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isfast = true;
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#else
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#error "unsupported architecture"
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#endif
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} else if (IsMetal()) {
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isfast = false;
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res = sys_gettimeofday_metal;
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} else {
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isfast = false;
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res = sys_gettimeofday;
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}
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if (opt_out_isfast) {
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*opt_out_isfast = isfast;
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}
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return res;
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}
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static axdx_t __gettimeofday_init(struct timeval *tv, //
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struct timezone *tz, //
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void *arg) {
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gettimeofday_f *gettime;
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__gettimeofday = gettime = __gettimeofday_get(0);
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return gettime(tv, tz, 0);
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}
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