/*
 * Copyright (c) 1996, 1998-2000 University of Utah and the Flux Group.
 * All rights reserved.
 * 
 * This file is part of the Flux OSKit.  The OSKit is free software, also known
 * as "open source;" you can redistribute it and/or modify it under the terms
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF).  To explore alternate licensing terms, contact
 * the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
 * 
 * The OSKit 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 GPL for more details.  You should have
 * received a copy of the GPL along with the OSKit; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */

/*
 * Set priority of a thread.
 */
#include <threads/pthread_internal.h>

int
oskit_pthread_setprio(pthread_t tid, int prio)
{
	pthread_thread_t	*pthread;
	struct sched_param	param;

	if ((pthread = tidtothread(tid)) == NULL_THREADPTR)
		return EINVAL;

	if (prio < PRIORITY_MIN || prio > PRIORITY_MAX)
		return EINVAL;

	param.priority = prio;

	assert_preemption_enabled();
	disable_preemption();

	/*
	 * Pass this off to the scheduler module. The simple POSIX
	 * model allows the policy and priority to be changed, so
	 * indicate no-change to policy with a -1.
	 */
	pthread_sched_change_state(pthread, -1, &param);

	enable_preemption();
	return 0;
}