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/* $OpenBSD: microtime.c,v 1.2 2022/07/23 22:58:51 cheloha Exp $ */
/*
* Copyright (c) 2000 Poul-Henning Kamp <phk@FreeBSD.org>
* Copyright (c) 2020 Paul Irofti <paul@irofti.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/atomic.h>
#include <sys/timetc.h>
#include <time.h>
/*
* Return the difference between the timehands' counter value now and what
* was when we copied it to the timehands' offset_count.
*/
static inline int
tc_delta(struct timekeep *tk, u_int *delta)
{
u_int tc;
if (_tc_get_timecount(tk, &tc))
return -1;
*delta = (tc - tk->tk_offset_count) & tk->tk_counter_mask;
return 0;
}
static int
binuptime(struct bintime *bt, struct timekeep *tk)
{
u_int gen, delta;
do {
gen = tk->tk_generation;
membar_consumer();
if (tc_delta(tk, &delta))
return -1;
TIMECOUNT_TO_BINTIME(delta, tk->tk_scale, bt);
bintimeadd(bt, &tk->tk_offset, bt);
membar_consumer();
} while (gen == 0 || gen != tk->tk_generation);
return 0;
}
static int
binruntime(struct bintime *bt, struct timekeep *tk)
{
u_int gen, delta;
do {
gen = tk->tk_generation;
membar_consumer();
if (tc_delta(tk, &delta))
return -1;
TIMECOUNT_TO_BINTIME(delta, tk->tk_scale, bt);
bintimeadd(bt, &tk->tk_offset, bt);
bintimesub(bt, &tk->tk_naptime, bt);
membar_consumer();
} while (gen == 0 || gen != tk->tk_generation);
return 0;
}
static int
bintime(struct bintime *bt, struct timekeep *tk)
{
u_int gen, delta;
do {
gen = tk->tk_generation;
membar_consumer();
if (tc_delta(tk, &delta))
return -1;
TIMECOUNT_TO_BINTIME(delta, tk->tk_scale, bt);
bintimeadd(bt, &tk->tk_offset, bt);
bintimeadd(bt, &tk->tk_boottime, bt);
membar_consumer();
} while (gen == 0 || gen != tk->tk_generation);
return 0;
}
int
_microtime(struct timeval *tvp, struct timekeep *tk)
{
struct bintime bt;
if (bintime(&bt, tk))
return -1;
BINTIME_TO_TIMEVAL(&bt, tvp);
return 0;
}
int
_nanotime(struct timespec *tsp, struct timekeep *tk)
{
struct bintime bt;
if (bintime(&bt, tk))
return -1;
BINTIME_TO_TIMESPEC(&bt, tsp);
return 0;
}
int
_nanoruntime(struct timespec *ts, struct timekeep *tk)
{
struct bintime bt;
if (binruntime(&bt, tk))
return -1;
BINTIME_TO_TIMESPEC(&bt, ts);
return 0;
}
int
_nanouptime(struct timespec *tsp, struct timekeep *tk)
{
struct bintime bt;
if (binuptime(&bt, tk))
return -1;
BINTIME_TO_TIMESPEC(&bt, tsp);
return 0;
}
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