WiringPi/wiringPi/piHiPri.c

/*
 * piHiPri:
 *	Simple way to get your program running at high priority
 *	with realtime schedulling.
 *
 *	Copyright (c) 2012 Gordon Henderson
 ***********************************************************************
 * This file is part of wiringPi:
 *	https://projects.drogon.net/raspberry-pi/wiringpi/
 *
 *    wiringPi is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU Lesser General Public License as
 *    published by the Free Software Foundation, either version 3 of the
 *    License, or (at your option) any later version.
 *
 *    wiringPi 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 General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with wiringPi.
 *    If not, see <http://www.gnu.org/licenses/>.
 ***********************************************************************
 */

#include <sched.h>
#include <string.h>

#include "wiringPi.h"


/*
 * piHiPri:
 *	Attempt to set a high priority schedulling for the running program
 *********************************************************************************
 */

int piHiPri (const int pri)
{
  struct sched_param sched ;

  memset (&sched, 0, sizeof(sched)) ;

  if (pri > sched_get_priority_max (SCHED_RR))
    sched.sched_priority = sched_get_priority_max (SCHED_RR) ;
  else
    sched.sched_priority = pri ;

  return sched_setscheduler (0, SCHED_RR, &sched) ;
}