| 1 | /*
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| 2 | * Copyright (C) 2001-2004 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef __SCHEDULER_H__
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| 30 | #define __SCHEDULER_H__
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| 31 |
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| 32 | #include <synch/spinlock.h>
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| 33 | #include <time/clock.h> /* HZ */
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| 34 | #include <typedefs.h>
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| 35 | #include <list.h>
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| 36 |
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| 37 | #define RQ_COUNT 16
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| 38 | #define NEEDS_RELINK_MAX (HZ)
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| 39 |
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| 40 | struct runq {
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| 41 | spinlock_t lock;
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| 42 | link_t rq_head; /**< List of ready threads. */
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| 43 | int n; /**< Number of threads in rq_ready. */
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| 44 | };
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| 45 |
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| 46 | extern volatile count_t nrdy;
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| 47 |
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| 48 | static thread_t *find_best_thread(void);
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| 49 | static void relink_rq(int start);
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| 50 | static void scheduler_separated_stack(void);
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| 51 |
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| 52 | extern void scheduler_init(void);
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| 53 |
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| 54 | extern void scheduler_fpu_lazy_request(void);
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| 55 | extern void scheduler(void);
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| 56 | extern void kcpulb(void *arg);
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| 57 |
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| 58 | /*
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| 59 | * To be defined by architectures:
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| 60 | */
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| 61 |
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| 62 | extern void before_thread_runs(void);
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| 63 | extern void before_thread_runs_arch(void);
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| 64 |
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| 65 | #endif
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