scheduler.h

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00001 /*
00002  * Copyright (C) 2001-2004 Jakub Jermar
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  *
00009  * - Redistributions of source code must retain the above copyright
00010  *   notice, this list of conditions and the following disclaimer.
00011  * - Redistributions in binary form must reproduce the above copyright
00012  *   notice, this list of conditions and the following disclaimer in the
00013  *   documentation and/or other materials provided with the distribution.
00014  * - The name of the author may not be used to endorse or promote products
00015  *   derived from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00018  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00019  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00020  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
00021  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
00022  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00023  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00024  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00025  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
00026  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027  */
00028 
00035 #ifndef __SCHEDULER_H__
00036 #define __SCHEDULER_H__
00037 
00038 #include <synch/spinlock.h>
00039 #include <time/clock.h>         /* HZ */
00040 #include <typedefs.h>
00041 #include <atomic.h>
00042 #include <adt/list.h>
00043 
00044 #define RQ_COUNT                16
00045 #define NEEDS_RELINK_MAX        (HZ)
00046 
00048 struct runq {
00049         SPINLOCK_DECLARE(lock);
00050         link_t rq_head;         
00051         count_t n;              
00052 };
00053 
00054 extern atomic_t nrdy;
00055 extern void scheduler_init(void);
00056 
00057 extern void scheduler_fpu_lazy_request(void);
00058 extern void scheduler(void);
00059 extern void kcpulb(void *arg);
00060 
00061 extern void sched_print_list(void);
00062 
00063 /*
00064  * To be defined by architectures:
00065  */
00066 extern void before_task_runs_arch(void);
00067 extern void before_thread_runs_arch(void);
00068 extern void after_thread_ran_arch(void);
00069 
00070 #endif
00071 

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