/* -*- mia-c++ -*-
** Copyrigh (C) 1999 Max-Planck-Institute of Cognitive Neurosience
** Gert Wollny <wollny@cns.mpg.de>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU Lesser Public License as published by
** the Free Software Foundation; either version 2.1 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 Lesser Public License for more details.
**
** You should have received a copy of the GNU Lesser 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.
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <sys/time.h>
#include <mia/core/watch.hh>
NS_MIA_BEGIN
const int TIMERSPAN=2000;
CWatch::CWatch()
{
itimerval value;
itimerval oldvalue;
value.it_interval.tv_sec = TIMERSPAN;
value.it_interval.tv_usec= 0;
value.it_value.tv_sec = TIMERSPAN;
value.it_value.tv_usec = 0;
if (signal(SIGVTALRM,CWatch::overlap_handler)==SIG_ERR){
fprintf(stderr,"Unable to catch signal:%s\n",strerror(errno));
}
if (setitimer(ITIMER_VIRTUAL,&value,&oldvalue)) {
fprintf(stderr,"Warning: setitimer returned with %s\n",strerror(errno));
}
}
double CWatch::get_seconds()
{
itimerval value;
if (getitimer(ITIMER_VIRTUAL,&value)){
fprintf(stderr,"Warning: setitimer returned %s\n",strerror(errno));
}
double result = TIMERSPAN - value.it_value.tv_sec;
double resultlow = value.it_value.tv_usec/1e+6;
return (result - resultlow) + TIMERSPAN*double(overlaps);
}
void CWatch::overlap_handler(int p_sig)
{
if (p_sig == SIGVTALRM) {
overlaps++;
}
signal(SIGVTALRM,CWatch::overlap_handler);
}
int CWatch::overlaps=0;
NS_MIA_END