1 /*- 2 * Copyright (c) 2001 Jake Burkholder <jake@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _RUNQ_H_ 30 #define _RUNQ_H_ 31 32 #include <machine/runq.h> 33 34 struct thread; 35 36 /* 37 * Run queue parameters. 38 */ 39 40 #define RQ_NQS (64) /* Number of run queues. */ 41 #define RQ_PPQ (4) /* Priorities per queue. */ 42 43 /* 44 * Head of run queues. 45 */ 46 TAILQ_HEAD(rqhead, thread); 47 48 /* 49 * Bit array which maintains the status of a run queue. When a queue is 50 * non-empty the bit corresponding to the queue number will be set. 51 */ 52 struct rqbits { 53 rqb_word_t rqb_bits[RQB_LEN]; 54 }; 55 56 /* 57 * Run queue structure. Contains an array of run queues on which processes 58 * are placed, and a structure to maintain the status of each queue. 59 */ 60 struct runq { 61 struct rqbits rq_status; 62 struct rqhead rq_queues[RQ_NQS]; 63 }; 64 65 void runq_add(struct runq *, struct thread *, int); 66 void runq_add_pri(struct runq *, struct thread *, u_char, int); 67 int runq_check(struct runq *); 68 struct thread *runq_choose(struct runq *); 69 struct thread *runq_choose_from(struct runq *, u_char); 70 struct thread *runq_choose_fuzz(struct runq *, int); 71 void runq_init(struct runq *); 72 void runq_remove(struct runq *, struct thread *); 73 void runq_remove_idx(struct runq *, struct thread *, u_char *); 74 75 #endif 76