dump1090/util.c
2017-01-27 12:33:43 +00:00

99 lines
3.7 KiB
C

// Part of dump1090, a Mode S message decoder for RTLSDR devices.
//
// util.c: misc utilities
//
// Copyright (c) 2015 Oliver Jowett <oliver@mutability.co.uk>
//
// This file is free software: you may copy, redistribute and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation, either version 2 of the License, or (at your
// option) any later version.
//
// This file is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// This file incorporates work covered by the following copyright and
// permission notice:
//
// Copyright (C) 2012 by Salvatore Sanfilippo <antirez@gmail.com>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * 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.
//
// 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
// HOLDER 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.
#include "dump1090.h"
#include <stdlib.h>
#include <sys/time.h>
uint64_t mstime(void)
{
struct timeval tv;
uint64_t mst;
gettimeofday(&tv, NULL);
mst = ((uint64_t)tv.tv_sec)*1000;
mst += tv.tv_usec/1000;
return mst;
}
int64_t receiveclock_ns_elapsed(uint64_t t1, uint64_t t2)
{
return (t2 - t1) * 1000U / 12U;
}
void normalize_timespec(struct timespec *ts)
{
if (ts->tv_nsec > 1000000000) {
ts->tv_sec += ts->tv_nsec / 1000000000;
ts->tv_nsec = ts->tv_nsec % 1000000000;
} else if (ts->tv_nsec < 0) {
long adjust = ts->tv_nsec / 1000000000 + 1;
ts->tv_sec -= adjust;
ts->tv_nsec = (ts->tv_nsec + 1000000000 * adjust) % 1000000000;
}
}
/* record current CPU time in start_time */
void start_cpu_timing(struct timespec *start_time)
{
clock_gettime(CLOCK_THREAD_CPUTIME_ID, start_time);
}
/* add difference between start_time and the current CPU time to add_to */
void end_cpu_timing(const struct timespec *start_time, struct timespec *add_to)
{
struct timespec end_time;
clock_gettime(CLOCK_THREAD_CPUTIME_ID, &end_time);
add_to->tv_sec += (end_time.tv_sec - start_time->tv_sec - 1);
add_to->tv_nsec += (1000000000L + end_time.tv_nsec - start_time->tv_nsec);
add_to->tv_sec += add_to->tv_nsec / 1000000000L;
add_to->tv_nsec = add_to->tv_nsec % 1000000000L;
}