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bec67fd3bb
processes. It did not return an error but instead just let garbage be passed back. This I fix so it actually properly translates the priority the process is at to a posix's high means more priority. I also fix it so that if the ULE scheduler has bumped it up to a realtime process you get back a sane value i.e. the highest priority (63 for time-share). sched_setscheduler() had the setting of the timeshare class priority disabled. With some notes about rejecting the posix high numbers is greater priority and use nice instead. This fix also adjusts that to work, with the cavet that a t-s process may well get bumped up or down i.e. the setscheduler() will NOT change the nice value only the current priority. I think this is reasonable considering if the user wants to play with nice then he can. At least all the posix'ish interfaces now respond sanely. MFC after: 3 weeks
289 lines
6.3 KiB
C
289 lines
6.3 KiB
C
/*-
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* Copyright (c) 1996, 1997
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* HD Associates, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by HD Associates, Inc
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* ksched: Soft real time scheduling based on "rtprio".
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_posix.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/posix4.h>
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#include <sys/resource.h>
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#include <sys/sched.h>
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/* ksched: Real-time extension to support POSIX priority scheduling.
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*/
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struct ksched {
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struct timespec rr_interval;
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};
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int
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ksched_attach(struct ksched **p)
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{
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struct ksched *ksched= p31b_malloc(sizeof(*ksched));
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ksched->rr_interval.tv_sec = 0;
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ksched->rr_interval.tv_nsec = 1000000000L / sched_rr_interval();
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*p = ksched;
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return 0;
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}
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int
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ksched_detach(struct ksched *ks)
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{
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p31b_free(ks);
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return 0;
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}
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/*
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* XXX About priorities
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*
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* POSIX 1003.1b requires that numerically higher priorities be of
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* higher priority. It also permits sched_setparam to be
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* implementation defined for SCHED_OTHER. I don't like
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* the notion of inverted priorites for normal processes when
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* you can use "setpriority" for that.
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*
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*/
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/* Macros to convert between the unix (lower numerically is higher priority)
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* and POSIX 1003.1b (higher numerically is higher priority)
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*/
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#define p4prio_to_rtpprio(P) (RTP_PRIO_MAX - (P))
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#define rtpprio_to_p4prio(P) (RTP_PRIO_MAX - (P))
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#define p4prio_to_tsprio(P) ((PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE) - (P))
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#define tsprio_to_p4prio(P) ((PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE) - (P))
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/* These improve readability a bit for me:
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*/
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#define P1B_PRIO_MIN rtpprio_to_p4prio(RTP_PRIO_MAX)
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#define P1B_PRIO_MAX rtpprio_to_p4prio(RTP_PRIO_MIN)
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static __inline int
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getscheduler(struct ksched *ksched, struct thread *td, int *policy)
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{
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struct rtprio rtp;
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int e = 0;
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pri_to_rtp(td, &rtp);
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switch (rtp.type)
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{
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case RTP_PRIO_FIFO:
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*policy = SCHED_FIFO;
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break;
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case RTP_PRIO_REALTIME:
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*policy = SCHED_RR;
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break;
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default:
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*policy = SCHED_OTHER;
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break;
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}
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return e;
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}
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int
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ksched_setparam(struct ksched *ksched,
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struct thread *td, const struct sched_param *param)
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{
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int policy;
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int e;
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e = getscheduler(ksched, td, &policy);
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if (e == 0)
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{
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e = ksched_setscheduler(ksched, td, policy, param);
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}
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return e;
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}
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int
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ksched_getparam(struct ksched *ksched,
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struct thread *td, struct sched_param *param)
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{
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struct rtprio rtp;
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pri_to_rtp(td, &rtp);
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if (RTP_PRIO_IS_REALTIME(rtp.type))
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param->sched_priority = rtpprio_to_p4prio(rtp.prio);
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else {
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if (PRI_MIN_TIMESHARE < rtp.prio)
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/*
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* The interactive score has it to min realtime
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* so we must show max (64 most likely
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*/
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param->sched_priority = (PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE);
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else
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param->sched_priority = tsprio_to_p4prio(rtp.prio);
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}
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return 0;
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}
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/*
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* XXX The priority and scheduler modifications should
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* be moved into published interfaces in kern/kern_sync.
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*
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* The permissions to modify process p were checked in "p31b_proc()".
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*
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*/
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int
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ksched_setscheduler(struct ksched *ksched,
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struct thread *td, int policy, const struct sched_param *param)
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{
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int e = 0;
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struct rtprio rtp;
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switch(policy)
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{
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case SCHED_RR:
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case SCHED_FIFO:
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if (param->sched_priority >= P1B_PRIO_MIN &&
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param->sched_priority <= P1B_PRIO_MAX)
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{
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rtp.prio = p4prio_to_rtpprio(param->sched_priority);
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rtp.type = (policy == SCHED_FIFO)
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? RTP_PRIO_FIFO : RTP_PRIO_REALTIME;
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rtp_to_pri(&rtp, td);
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}
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else
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e = EPERM;
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break;
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case SCHED_OTHER:
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if (param->sched_priority >= 0 &&
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param->sched_priority <= (PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE)) {
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rtp.type = RTP_PRIO_NORMAL;
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rtp.prio = p4prio_to_rtpprio(param->sched_priority);
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rtp_to_pri(&rtp, td);
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} else
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e = EINVAL;
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break;
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default:
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e = EINVAL;
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break;
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}
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return e;
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}
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int
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ksched_getscheduler(struct ksched *ksched, struct thread *td, int *policy)
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{
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return getscheduler(ksched, td, policy);
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}
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/* ksched_yield: Yield the CPU.
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*/
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int
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ksched_yield(struct ksched *ksched)
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{
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sched_relinquish(curthread);
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return 0;
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}
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int
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ksched_get_priority_max(struct ksched *ksched, int policy, int *prio)
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{
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int e = 0;
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switch (policy)
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{
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case SCHED_FIFO:
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case SCHED_RR:
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*prio = RTP_PRIO_MAX;
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break;
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case SCHED_OTHER:
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*prio = PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE;
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break;
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default:
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e = EINVAL;
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}
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return e;
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}
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int
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ksched_get_priority_min(struct ksched *ksched, int policy, int *prio)
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{
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int e = 0;
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switch (policy)
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{
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case SCHED_FIFO:
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case SCHED_RR:
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*prio = P1B_PRIO_MIN;
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break;
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case SCHED_OTHER:
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*prio = 0;
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break;
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default:
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e = EINVAL;
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}
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return e;
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}
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int
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ksched_rr_get_interval(struct ksched *ksched,
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struct thread *td, struct timespec *timespec)
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{
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*timespec = ksched->rr_interval;
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return 0;
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}
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