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1 jermar 1
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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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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 *
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 * - 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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 * - 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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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __SCHEDULER_H__
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#define __SCHEDULER_H__
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#include <synch/spinlock.h>
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#include <time/clock.h>     /* HZ */
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#include <typedefs.h>
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#include <list.h>
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#define RQ_COUNT        16
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#define NEEDS_RELINK_MAX    (HZ)
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struct runq {
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    spinlock_t lock;
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    link_t rq_head;     /**< List of ready threads. */
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    int n;          /**< Number of threads in rq_ready. */
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};
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extern volatile count_t nrdy;
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static thread_t *find_best_thread(void);
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static void relink_rq(int start);
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static void scheduler_separated_stack(void);
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extern void scheduler_init(void);
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extern void scheduler_fpu_lazy_request(void);
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extern void scheduler(void);
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extern void kcpulb(void *arg);
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/*
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 * To be defined by architectures:
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 */
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extern void before_thread_runs(void);
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extern void before_thread_runs_arch(void);
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#endif