6309165fe0
the width of all block comments. Includes a check to assure that all block comments use the same line width. Verified against all .c files under /sched. There were a few cosmetic changes to the coding style under /sched to account to new, correctly detected problems in the /sched files.
301 lines
8.7 KiB
C
301 lines
8.7 KiB
C
/****************************************************************************
|
|
* sched/clock/clock_timekeeping.c
|
|
*
|
|
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
|
|
* Author: Max Neklyudov <macscomp@gmail.com>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#ifdef CONFIG_CLOCK_TIMEKEEPING
|
|
|
|
#include <sys/time.h>
|
|
#include <stdint.h>
|
|
#include <time.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/irq.h>
|
|
#include <nuttx/arch.h>
|
|
|
|
#include "clock/clock.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#define NTP_MAX_ADJUST 500
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
static struct timespec g_clock_wall_time;
|
|
static uint64_t g_clock_last_counter;
|
|
static uint64_t g_clock_mask;
|
|
static long g_clock_adjust;
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: clock_get_current_time
|
|
****************************************************************************/
|
|
|
|
static int clock_get_current_time(FAR struct timespec *ts,
|
|
FAR struct timespec *base)
|
|
{
|
|
irqstate_t flags;
|
|
uint64_t counter;
|
|
uint64_t offset;
|
|
uint64_t nsec;
|
|
time_t sec;
|
|
int ret;
|
|
|
|
flags = enter_critical_section();
|
|
|
|
ret = up_timer_getcounter(&counter);
|
|
if (ret < 0)
|
|
{
|
|
goto errout_in_critical_section;
|
|
}
|
|
|
|
offset = (counter - g_clock_last_counter) & g_clock_mask;
|
|
nsec = offset * NSEC_PER_TICK;
|
|
sec = nsec / NSEC_PER_SEC;
|
|
nsec -= sec * NSEC_PER_SEC;
|
|
|
|
nsec += base->tv_nsec;
|
|
if (nsec >= NSEC_PER_SEC)
|
|
{
|
|
nsec -= NSEC_PER_SEC;
|
|
sec += 1;
|
|
}
|
|
|
|
ts->tv_nsec = nsec;
|
|
ts->tv_sec = base->tv_sec + sec;
|
|
|
|
errout_in_critical_section:
|
|
leave_critical_section(flags);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: clock_timekeeping_get_wall_time
|
|
****************************************************************************/
|
|
|
|
int clock_timekeeping_get_wall_time(FAR struct timespec *ts)
|
|
{
|
|
return clock_get_current_time(ts, &g_clock_wall_time);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: clock_timekeeping_set_wall_time
|
|
****************************************************************************/
|
|
|
|
int clock_timekeeping_set_wall_time(FAR struct timespec *ts)
|
|
{
|
|
irqstate_t flags;
|
|
uint64_t counter;
|
|
int ret;
|
|
|
|
flags = enter_critical_section();
|
|
|
|
ret = up_timer_getcounter(&counter);
|
|
if (ret < 0)
|
|
{
|
|
goto errout_in_critical_section;
|
|
}
|
|
|
|
g_clock_wall_time = *ts;
|
|
g_clock_adjust = 0;
|
|
g_clock_last_counter = counter;
|
|
|
|
errout_in_critical_section:
|
|
leave_critical_section(flags);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: adjtime
|
|
*
|
|
* Description:
|
|
* The adjtime() function gradually adjusts the system clock (as returned
|
|
* by gettimeofday(2)). The amount of time by which the clock is to be
|
|
* adjusted is specified in the structure pointed to by delta.
|
|
*
|
|
* This structure has the following form:
|
|
*
|
|
* struct timeval
|
|
* {
|
|
* time_t tv_sec; (seconds)
|
|
* suseconds_t tv_usec; (microseconds)
|
|
* };
|
|
*
|
|
* If the adjustment in delta is positive, then the system clock is
|
|
* speeded up by some small percentage (i.e., by adding a small amount of
|
|
* time to the clock value in each second) until the adjustment has been
|
|
* completed. If the adjustment in delta is negative, then the clock is
|
|
* slowed down in a similar fashion.
|
|
*
|
|
* If a clock adjustment from an earlier adjtime() call is already in
|
|
* progress at the time of a later adjtime() call, and delta is not NULL
|
|
* for the later call, then the earlier adjustment is stopped, but any
|
|
* already completed part of that adjustment is not undone.
|
|
*
|
|
* If olddelta is not NULL, then the buffer that it points to is used to
|
|
* return the amount of time remaining from any previous adjustment that
|
|
* has not yet been completed.
|
|
*
|
|
* NOTE: This is not a POSIX interface but derives from 4.3BSD, System V.
|
|
* It is also supported for Linux compatibility.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int adjtime(FAR const struct timeval *delta, FAR struct timeval *olddelta)
|
|
{
|
|
irqstate_t flags;
|
|
long adjust_usec;
|
|
|
|
if (!delta)
|
|
{
|
|
set_errno(EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
flags = enter_critical_section();
|
|
|
|
adjust_usec = delta->tv_sec * USEC_PER_SEC + delta->tv_usec;
|
|
|
|
if (olddelta)
|
|
{
|
|
olddelta->tv_usec = g_clock_adjust;
|
|
}
|
|
|
|
g_clock_adjust = adjust_usec;
|
|
|
|
leave_critical_section(flags);
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: clock_update_wall_time
|
|
****************************************************************************/
|
|
|
|
void clock_update_wall_time(void)
|
|
{
|
|
irqstate_t flags;
|
|
uint64_t counter;
|
|
uint64_t offset;
|
|
int64_t nsec;
|
|
time_t sec;
|
|
int ret;
|
|
|
|
flags = enter_critical_section();
|
|
|
|
ret = up_timer_getcounter(&counter);
|
|
if (ret < 0)
|
|
{
|
|
goto errout_in_critical_section;
|
|
}
|
|
|
|
offset = (counter - g_clock_last_counter) & g_clock_mask;
|
|
if (offset == 0)
|
|
{
|
|
goto errout_in_critical_section;
|
|
}
|
|
|
|
nsec = offset * NSEC_PER_TICK;
|
|
sec = nsec / NSEC_PER_SEC;
|
|
nsec -= sec * NSEC_PER_SEC;
|
|
|
|
nsec += g_clock_wall_time.tv_nsec;
|
|
if (nsec >= NSEC_PER_SEC)
|
|
{
|
|
nsec -= NSEC_PER_SEC;
|
|
sec += 1;
|
|
}
|
|
|
|
if (g_clock_adjust != 0 && sec > 0)
|
|
{
|
|
long adjust = NTP_MAX_ADJUST * (long)sec;
|
|
if (g_clock_adjust < adjust && g_clock_adjust > -adjust)
|
|
{
|
|
adjust = g_clock_adjust;
|
|
}
|
|
|
|
nsec += adjust * NSEC_PER_USEC;
|
|
|
|
while (nsec < 0)
|
|
{
|
|
nsec += NSEC_PER_SEC;
|
|
sec -= 1;
|
|
}
|
|
|
|
while (nsec >= NSEC_PER_SEC)
|
|
{
|
|
nsec -= NSEC_PER_SEC;
|
|
sec += 1;
|
|
}
|
|
}
|
|
|
|
g_clock_wall_time.tv_sec += sec;
|
|
g_clock_wall_time.tv_nsec = (long)nsec;
|
|
|
|
g_clock_last_counter = counter;
|
|
|
|
errout_in_critical_section:
|
|
leave_critical_section(flags);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: clock_inittimekeeping
|
|
****************************************************************************/
|
|
|
|
void clock_inittimekeeping(void)
|
|
{
|
|
up_timer_getmask(&g_clock_mask);
|
|
clock_basetime(&g_clock_wall_time);
|
|
up_timer_getcounter(&g_clock_last_counter);
|
|
}
|
|
|
|
#endif /* CONFIG_CLOCK_TIMEKEEPING */
|