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   1 /*-
   2  * Copyright (c) 2005-2007, Kohsuke Ohtani
   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  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #ifndef _SCHED_H
  31 #define _SCHED_H
  33 #include <types.h>
  34 #include <sys/cdefs.h>
  35 #include <sys/queue.h>
  36 #include <event.h>
  38 /*
  39  * Scheduling policies defined by IEEE Std 1003.1-2001
  40  */
  41 #define SCHED_FIFO      0       /* First in-first out */
  42 #define SCHED_RR        1       /* Round robin */
  43 #define SCHED_OTHER     2       /* Another scheduling policy */
  45 /*
  46  * Scheduling quantum (Ticks for context switch)
  47  */
  48 #define QUANTUM         (CONFIG_TIME_SLICE * HZ / 1000)
  50 /*
  51  * DPC (Deferred Procedure Call) object
  52  */
  53 struct dpc {
  54         struct queue    link;           /* linkage on DPC queue */
  55         int             state;
  56         void            (*func)(void *); /* callback routine */
  57         void            *arg;           /* argument to pass */
  58 };
  60 /* state for DPC */
  61 #define DPC_FREE        0x4470463f      /* magic# 'DpF?' */
  62 #define DPC_PENDING     0x4470503f      /* magic# 'DpP?' */
  64 #define sched_sleep(evt)        sched_tsleep((evt), 0)
__BEGIN_DECLS
  67 int      sched_tsleep(struct event *, u_long);
  68 void     sched_wakeup(struct event *);
thread_t sched_wakeone(struct event *);
  70 void     sched_unsleep(thread_t, int);
  71 void     sched_yield(void);
  72 void     sched_suspend(thread_t);
  73 void     sched_resume(thread_t);
  74 void     sched_tick(void);
  75 void     sched_start(thread_t, int, int);
  76 void     sched_stop(thread_t);
  77 void     sched_lock(void);
  78 void     sched_unlock(void);
  79 int      sched_getpri(thread_t);
  80 void     sched_setpri(thread_t, int, int);
  81 int      sched_getpolicy(thread_t);
  82 int      sched_setpolicy(thread_t, int);
  83 void     sched_dpc(struct dpc *, void (*)(void *), void *);
  84 void     sched_init(void);
__END_DECLS
  87 #endif /* !_SCHED_H */