/* Libvisual - The audio visualisation framework.
*
* Copyright (C) 2004, 2005, 2006 Dennis Smit <ds@nerds-incorporated.org>
*
* Authors: Dennis Smit <ds@nerds-incorporated.org>
*
* $Id: lv_os.c,v 1.3 2006/01/26 15:13:37 synap Exp $
*
* This program 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 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 General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "config.h"
#ifdef HAVE_SCHED_H
# include <sched.h>
# include <sys/types.h>
# define HAVE_SCHED 1
#elif defined HAVE_SYS_SCHED_H
# include <sys/sched.h>
# include <sys/types.h>
# define HAVE_SCHED 1
#endif
#include "lv_os.h"
/**
* @defgroup VisOS VisOS
* @{
*/
/* FIXME: Lock all memory in realtime mode ? */
/**
* Puts the process in soft realtime mode. Be very careful with using this, it's very much possible to lock your
* system up. Only works as super user.
*/
int visual_os_scheduler_realtime_start ()
{
#ifdef HAVE_SCHED
struct sched_param attr;
int ret;
attr.sched_priority = 99;
/* FIXME: Do we want RR or FIFO here ? */
ret = sched_setscheduler (getpid (), SCHED_FIFO, &attr);
return ret >= 0 ? VISUAL_OK : -VISUAL_ERROR_OS_SCHED;
#else
return -VISUAL_ERROR_OS_SCHED_NOT_SUPPORTED;
#endif
}
/**
* Returns to normal execution mode. Only works as super user.
*/
int visual_os_scheduler_realtime_stop ()
{
#ifdef HAVE_SCHED
struct sched_param attr;
int ret;
attr.sched_priority = 0;
ret = sched_setscheduler (getpid (), SCHED_OTHER, &attr);
return ret >= 0 ? VISUAL_OK : -VISUAL_ERROR_OS_SCHED;
#else
return -VISUAL_ERROR_OS_SCHED_NOT_SUPPORTED;
#endif
}
/**
* Yield the process. Don't rely on this.
*/
int visual_os_scheduler_yield ()
{
#ifdef HAVE_SCHED
sched_yield ();
return VISUAL_OK;
#else
return -VISUAL_ERROR_OS_SCHED_NOT_SUPPORTED;
#endif
}
/**
* @}
*/