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/* $NetBSD: sched.c,v 1.4 2012/03/18 02:04:39 christos Exp $ */
/*
* Copyright (c) 2008, Mindaugas Rasiukevicius <rmind at NetBSD org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: sched.c,v 1.4 2012/03/18 02:04:39 christos Exp $");
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sched.h>
#include <signal.h>
#include <sys/param.h>
#include <sys/types.h>
/* All LWPs in the process */
#define P_ALL_LWPS 0
/*
* Scheduling parameters.
*/
int
sched_setparam(pid_t pid, const struct sched_param *param)
{
struct sched_param sp;
memset(&sp, 0, sizeof(struct sched_param));
sp.sched_priority = param->sched_priority;
return _sched_setparam(pid, P_ALL_LWPS, SCHED_NONE, &sp);
}
int
sched_getparam(pid_t pid, struct sched_param *param)
{
return _sched_getparam(pid, P_ALL_LWPS, NULL, param);
}
int
sched_setscheduler(pid_t pid, int policy, const struct sched_param *param)
{
struct sched_param sp;
int ret, old_policy;
ret = _sched_getparam(pid, P_ALL_LWPS, &old_policy, &sp);
if (ret < 0)
return ret;
memset(&sp, 0, sizeof(struct sched_param));
sp.sched_priority = param->sched_priority;
ret = _sched_setparam(pid, P_ALL_LWPS, policy, &sp);
if (ret < 0)
return ret;
return old_policy;
}
int
sched_getscheduler(pid_t pid)
{
struct sched_param sp;
int ret, policy;
ret = _sched_getparam(pid, P_ALL_LWPS, &policy, &sp);
if (ret < 0)
return ret;
return policy;
}
/*
* Scheduling priorities.
*/
int
sched_get_priority_max(int policy)
{
if (policy < SCHED_OTHER || policy > SCHED_RR) {
errno = EINVAL;
return -1;
}
return (int)sysconf(_SC_SCHED_PRI_MAX);
}
int
sched_get_priority_min(int policy)
{
if (policy < SCHED_OTHER || policy > SCHED_RR) {
errno = EINVAL;
return -1;
}
return (int)sysconf(_SC_SCHED_PRI_MIN);
}
int
/*ARGSUSED*/
sched_rr_get_interval(pid_t pid, struct timespec *interval)
{
if (pid && kill(pid, 0) == -1)
return -1;
interval->tv_sec = 0;
interval->tv_nsec = sysconf(_SC_SCHED_RT_TS) * 1000;
return 0;
}
/*
* Process affinity.
*/
int
sched_getaffinity_np(pid_t pid, size_t size, cpuset_t *cpuset)
{
return _sched_getaffinity(pid, P_ALL_LWPS, size, cpuset);
}
int
sched_setaffinity_np(pid_t pid, size_t size, cpuset_t *cpuset)
{
return _sched_setaffinity(pid, P_ALL_LWPS, size, cpuset);
}
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