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rtclock.cpp
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rtclock.cpp
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/*
* rtclock.cpp
*
* Realtime clock
*
* Copyright (C) 2015, 2016 Mikael Djurfeldt
*
* rtclock 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 3 of the License, or
* (at your option) any later version.
*
* libneurosim 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/>.
*
*/
#include "rtclock.h"
RTClock::RTClock (double interval)
{
interval_ = timevalFromSeconds (interval);
reset ();
}
void
RTClock::reset ()
{
gettimeofday (&start_, 0);
last_ = start_;
}
double
RTClock::time () const
{
struct timeval now;
gettimeofday (&now, 0);
timersub (&now, &start_, &now);
return secondsFromTimeval (now);
}
double
RTClock::steppedTime () const
{
struct timeval now;
timersub (&last_, &start_, &now);
return secondsFromTimeval (now);
}
void
RTClock::sleep (double t) const
{
struct timespec req = timespecFromSeconds (t);
nanosleep (&req, NULL);
}
void
RTClock::sleepNext ()
{
timeradd (&last_, &interval_, &last_);
#ifdef HAVE_CLOCK_NANOSLEEP
struct timespec req = timespecFromTimeval (last_);
clock_nanosleep (CLOCK_REALTIME, TIMER_ABSTIME, &req, NULL);
#else
struct timeval now;
gettimeofday (&now, 0);
timersub (&last_, &now, &now);
struct timespec req = timespecFromTimeval (now);
nanosleep (&req, NULL);
#endif
}
void
RTClock::sleepUntil (double t) const
{
struct timeval goal = timevalFromSeconds (t);
timeradd (&start_, &goal, &goal);
#ifdef HAVE_CLOCK_NANOSLEEP
struct timespec req = timespecFromTimeval (goal);
clock_nanosleep (CLOCK_REALTIME, TIMER_ABSTIME, &req, NULL);
#else
struct timeval now;
gettimeofday (&now, 0);
timersub (&goal, &now, &now);
struct timespec req = timespecFromTimeval (now);
nanosleep (&req, NULL);
#endif
}