#ifndef TEST_CHRONO
/* Copyright (C) 2014 J.F.Dockes
* This program is free software; you can redistribute it 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 program 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, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// Measure and display time intervals.
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <iostream>
#include "chrono.h"
using namespace std;
////////////////////
#ifndef CLOCK_REALTIME
#define CLOCK_REALTIME 1
#endif
#define MILLIS(TS1, TS2) \
((long long)((TS2).tv_sec - (TS1).tv_sec) * 1000LL + \
((TS2).tv_nsec - (TS1).tv_nsec) / 1000000)
#define MICROS(TS1, TS2) \
((long long)((TS2).tv_sec - (TS1).tv_sec) * 1000000LL + \
((TS2).tv_nsec - (TS1).tv_nsec) / 1000)
#define SECONDS(TS1, TS2) \
(float((TS2).tv_sec - (TS1).tv_sec) + \
float((TS2).tv_nsec - (TS1).tv_nsec) * 1e-9)
// We use gettimeofday instead of clock_gettime for now and get only
// uS resolution, because clock_gettime is more configuration trouble
// than it's worth
static void gettime(int, Chrono::TimeSpec *ts)
{
struct timeval tv;
gettimeofday(&tv, 0);
ts->tv_sec = tv.tv_sec;
ts->tv_nsec = tv.tv_usec * 1000;
}
///// End system interface (used to be much more complicated in the 199xs...)
Chrono::TimeSpec Chrono::o_now;
void Chrono::refnow()
{
gettime(CLOCK_REALTIME, &o_now);
}
long long Chrono::amicros() const
{
TimeSpec ts;
ts.tv_sec = 0;
ts.tv_nsec = 0;
return MICROS(ts, m_orig);
}
Chrono::Chrono()
{
restart();
}
// Reset and return value before rest in milliseconds
long Chrono::restart()
{
TimeSpec now;
gettime(CLOCK_REALTIME, &now);
long ret = MILLIS(m_orig, now);
m_orig = now;
return ret;
}
long Chrono::urestart()
{
TimeSpec now;
gettime(CLOCK_REALTIME, &now);
long ret = MICROS(m_orig, now);
m_orig = now;
return ret;
}
// Get current timer value, milliseconds
long Chrono::millis(bool frozen)
{
if (frozen) {
return MILLIS(m_orig, o_now);
} else {
TimeSpec now;
gettime(CLOCK_REALTIME, &now);
return MILLIS(m_orig, now);
}
}
//
long Chrono::micros(bool frozen)
{
if (frozen) {
return MICROS(m_orig, o_now);
} else {
TimeSpec now;
gettime(CLOCK_REALTIME, &now);
return MICROS(m_orig, now);
}
}
float Chrono::secs(bool frozen)
{
if (frozen) {
return SECONDS(m_orig, o_now);
} else {
TimeSpec now;
gettime(CLOCK_REALTIME, &now);
return SECONDS(m_orig, now);
}
}
#else
///////////////////// test driver
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <iostream>
#include "chrono.h"
using namespace std;
static char *thisprog;
static void
Usage(void)
{
fprintf(stderr, "Usage : %s \n", thisprog);
exit(1);
}
Chrono achrono;
Chrono rchrono;
void
showsecs(long msecs)
{
fprintf(stderr, "%3.5f S", ((float)msecs) / 1000.0);
}
void
sigint(int sig)
{
signal(SIGINT, sigint);
signal(SIGQUIT, sigint);
fprintf(stderr, "Absolute interval: ");
showsecs(achrono.millis());
fprintf(stderr, ". Relative interval: ");
showsecs(rchrono.restart());
cerr << " Abs micros: " << rchrono.amicros() <<
" Relabs micros: " << rchrono.amicros() - 1430477861905884LL
<< endl;
fprintf(stderr, ".\n");
if (sig == SIGQUIT) {
exit(0);
}
}
int main(int argc, char **argv)
{
thisprog = argv[0];
argc--;
argv++;
if (argc != 0) {
Usage();
}
for (int i = 0; i < 50000000; i++);
fprintf(stderr, "Start secs: %.2f\n", achrono.secs());
fprintf(stderr, "Type ^C for intermediate result, ^\\ to stop\n");
signal(SIGINT, sigint);
signal(SIGQUIT, sigint);
achrono.restart();
rchrono.restart();
while (1) {
pause();
}
}
#endif /*TEST_CHRONO*/