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/*-
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 * Copyright (c) 2005-2007, Kohsuke Ohtani
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 * 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. 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 THE AUTHOR 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 THE AUTHOR 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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#ifndef _SCHED_H
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#define _SCHED_H
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#include <types.h>
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#include <sys/cdefs.h>
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#include <sys/queue.h>
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#include <event.h>
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/*
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 * Scheduling policies defined by IEEE Std 1003.1-2001
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 */
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#define SCHED_FIFO        0        /* First in-first out */
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#define SCHED_RR        1        /* Round robin */
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#define        SCHED_OTHER        2        /* Another scheduling policy */
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/*
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 * Scheduling quantum (Ticks for context switch)
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 */
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#define QUANTUM                (CONFIG_TIME_SLICE * HZ / 1000)
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/*
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 * DPC (Deferred Procedure Call) object
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 */
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struct dpc {
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        struct queue        link;                /* linkage on DPC queue */
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        int                state;
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        void                (*func)(void *); /* callback routine */
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        void                *arg;                /* argument to pass */
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};
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/* state for DPC */
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#define DPC_FREE        0x4470463f        /* magic# 'DpF?' */
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#define DPC_PENDING        0x4470503f        /* magic# 'DpP?' */
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#define sched_sleep(evt)        sched_tsleep((evt), 0)
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__BEGIN_DECLS
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int         sched_tsleep(struct event *, u_long);
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void         sched_wakeup(struct event *);
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thread_t sched_wakeone(struct event *);
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void         sched_unsleep(thread_t, int);
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void         sched_yield(void);
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void         sched_suspend(thread_t);
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void         sched_resume(thread_t);
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void         sched_tick(void);
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void         sched_start(thread_t, int, int);
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void         sched_stop(thread_t);
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void         sched_lock(void);
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void         sched_unlock(void);
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int         sched_getpri(thread_t);
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void         sched_setpri(thread_t, int, int);
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int         sched_getpolicy(thread_t);
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int         sched_setpolicy(thread_t, int);
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void         sched_dpc(struct dpc *, void (*)(void *), void *);
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void         sched_init(void);
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__END_DECLS
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#endif /* !_SCHED_H */