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/*-
* Copyright (c) 1994, Henrik Vestergaard Draboel
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Henrik Vestergaard Draboel.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*
* $FreeBSD: release/9.1.0/sys/sys/priority.h 221829 2011-05-13 05:27:58Z mdf $
*/
#ifndef _SYS_PRIORITY_H_
#define _SYS_PRIORITY_H_
/*
* Process priority specifications.
*/
/*
* Priority classes.
*/
#define PRI_ITHD 1 /* Interrupt thread. */
#define PRI_REALTIME 2 /* Real time process. */
#define PRI_TIMESHARE 3 /* Time sharing process. */
#define PRI_IDLE 4 /* Idle process. */
/*
* PRI_FIFO is POSIX.1B SCHED_FIFO.
*/
#define PRI_FIFO_BIT 8
#define PRI_FIFO (PRI_FIFO_BIT | PRI_REALTIME)
#define PRI_BASE(P) ((P) & ~PRI_FIFO_BIT)
#define PRI_IS_REALTIME(P) (PRI_BASE(P) == PRI_REALTIME)
#define PRI_NEED_RR(P) ((P) != PRI_FIFO)
/*
* Priorities. Note that with 64 run queues, differences less than 4 are
* insignificant.
*/
/*
* Priorities range from 0 to 255, but differences of less then 4 (RQ_PPQ)
* are insignificant. Ranges are as follows:
*
* Interrupt threads: 0 - 47
* Realtime user threads: 48 - 79
* Top half kernel threads: 80 - 119
* Time sharing user threads: 120 - 223
* Idle user threads: 224 - 255
*
* XXX If/When the specific interrupt thread and top half thread ranges
* disappear, a larger range can be used for user processes.
*/
#define PRI_MIN (0) /* Highest priority. */
#define PRI_MAX (255) /* Lowest priority. */
#define PRI_MIN_ITHD (PRI_MIN)
#define PRI_MAX_ITHD (PRI_MIN_REALTIME - 1)
#define PI_REALTIME (PRI_MIN_ITHD + 0)
#define PI_AV (PRI_MIN_ITHD + 4)
#define PI_NET (PRI_MIN_ITHD + 8)
#define PI_DISK (PRI_MIN_ITHD + 12)
#define PI_TTY (PRI_MIN_ITHD + 16)
#define PI_DULL (PRI_MIN_ITHD + 20)
#define PI_SOFT (PRI_MIN_ITHD + 24)
#define PI_SWI(x) (PI_SOFT + (x) * RQ_PPQ)
#define PRI_MIN_REALTIME (48)
#define PRI_MAX_REALTIME (PRI_MIN_KERN - 1)
#define PRI_MIN_KERN (80)
#define PRI_MAX_KERN (PRI_MIN_TIMESHARE - 1)
#define PSWP (PRI_MIN_KERN + 0)
#define PVM (PRI_MIN_KERN + 4)
#define PINOD (PRI_MIN_KERN + 8)
#define PRIBIO (PRI_MIN_KERN + 12)
#define PVFS (PRI_MIN_KERN + 16)
#define PZERO (PRI_MIN_KERN + 20)
#define PSOCK (PRI_MIN_KERN + 24)
#define PWAIT (PRI_MIN_KERN + 28)
#define PLOCK (PRI_MIN_KERN + 32)
#define PPAUSE (PRI_MIN_KERN + 36)
#define PRI_MIN_TIMESHARE (120)
#define PRI_MAX_TIMESHARE (PRI_MIN_IDLE - 1)
#define PUSER (PRI_MIN_TIMESHARE)
#define PRI_MIN_IDLE (224)
#define PRI_MAX_IDLE (PRI_MAX)
#ifdef _KERNEL
/* Other arguments for kern_yield(9). */
#define PRI_USER -2 /* Change to current user priority. */
#define PRI_UNCHANGED -1 /* Do not change priority. */
#endif
struct priority {
u_char pri_class; /* Scheduling class. */
u_char pri_level; /* Normal priority level. */
u_char pri_native; /* Priority before propogation. */
u_char pri_user; /* User priority based on p_cpu and p_nice. */
};
#endif /* !_SYS_PRIORITY_H_ */