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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "lint.h"
#include "thr_uberdata.h"
#include <sched.h>
#include <sys/priocntl.h>
#include <sys/rtpriocntl.h>
#include <sys/tspriocntl.h>
#include <sys/rt.h>
#include <sys/ts.h>
/*
* The following variables are used for caching information
* for priocntl TS and RT scheduling classs.
*/
static int rt_rrmin;
static int rt_rrmax;
static int rt_fifomin;
static int rt_fifomax;
static int rt_othermin;
static int rt_othermax;
/*
* Set the RT priority/policy of a lwp/thread.
*/
int
_thrp_setlwpprio(lwpid_t lwpid, int policy, int pri)
{
pcinfo_t pcinfo;
pcparms_t pcparm;
int rt = 0;
ASSERT(((policy == SCHED_FIFO) || (policy == SCHED_RR) ||
(policy == SCHED_OTHER)));
if ((policy == SCHED_FIFO) || (policy == SCHED_RR)) {
rt = 1;
}
if (rt) {
(void) strcpy(pcinfo.pc_clname, "RT");
} else {
(void) strcpy(pcinfo.pc_clname, "TS");
}
pcparm.pc_cid = PC_CLNULL;
if (priocntl(0, 0, PC_GETCID, (caddr_t)&pcinfo) < 0) {
return (errno);
}
pcparm.pc_cid = pcinfo.pc_cid;
if (rt) {
((rtparms_t *)pcparm.pc_clparms)->rt_tqnsecs =
(policy == SCHED_RR ? RT_TQDEF : RT_TQINF);
((rtparms_t *)pcparm.pc_clparms)->rt_pri = pri;
} else {
((tsparms_t *)pcparm.pc_clparms)->ts_uprilim = TS_NOCHANGE;
((tsparms_t *)pcparm.pc_clparms)->ts_upri = TS_NOCHANGE;
}
if (priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&pcparm) == -1) {
return (errno);
}
return (0);
}
/*
* Get SCHED_FIFO, SCHED_RR, SCHED_OTHER priority ranges.
*/
static void
_init_rt_prio_ranges()
{
rt_rrmin = sched_get_priority_min(SCHED_RR);
rt_rrmax = sched_get_priority_max(SCHED_RR);
rt_fifomin = sched_get_priority_min(SCHED_FIFO);
rt_fifomax = sched_get_priority_max(SCHED_FIFO);
rt_othermin = sched_get_priority_min(SCHED_OTHER);
rt_othermax = sched_get_priority_max(SCHED_OTHER);
}
/*
* Validate priorities.
*/
int
_validate_rt_prio(int policy, int pri)
{
static mutex_t prio_lock = DEFAULTMUTEX;
static int initialized = 0;
if (!initialized) {
lmutex_lock(&prio_lock);
if (!initialized) { /* do this only once */
_init_rt_prio_ranges();
_membar_producer();
initialized = 1;
}
lmutex_unlock(&prio_lock);
}
_membar_consumer();
switch (policy) {
case SCHED_FIFO:
return (pri < rt_fifomin || pri > rt_fifomax);
case SCHED_RR:
return (pri < rt_rrmin || pri > rt_rrmax);
case SCHED_OTHER:
return (pri < rt_othermin || pri > rt_othermax);
}
return (1);
}
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