The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/sched.h

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    1 /*-
    2  * Copyright (c) 2002, Jeffrey Roberson <jeff@freebsd.org>
    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 unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/5.0/sys/sys/sched.h 107137 2002-11-21 09:30:55Z jeff $
   27  */
   28 
   29 #ifndef _SYS_SCHED_H_
   30 #define _SYS_SCHED_H_
   31 
   32 /*
   33  * General scheduling info.
   34  */
   35 int     sched_rr_interval(void);
   36 int     sched_runnable(void);
   37 
   38 /*
   39  * KSE Groups contain scheduling priority information.  They record the
   40  * behavior of groups of KSEs and threads.
   41  */
   42 void    sched_exit(struct ksegrp *kg, struct ksegrp *child);
   43 void    sched_fork(struct ksegrp *kg, struct ksegrp *child);
   44 void    sched_nice(struct ksegrp *kg, int nice);
   45 void    sched_prio(struct thread *td, u_char prio);
   46 void    sched_userret(struct thread *td);
   47 
   48 /*
   49  * Threads are switched in and out, block on resources, and have temporary
   50  * priorities inherited from their ksegs.
   51  */
   52 void    sched_clock(struct thread *td);
   53 void    sched_sleep(struct thread *td, u_char prio);
   54 void    sched_switchin(struct thread *td);
   55 void    sched_switchout(struct thread *td);
   56 void    sched_wakeup(struct thread *td);
   57 
   58 /*
   59  * KSEs are moved on and off of run queues.
   60  */
   61 void    sched_add(struct kse *ke);
   62 void    sched_rem(struct kse *ke);
   63 struct kse *sched_choose(void);
   64 
   65 /*
   66  * and they use up cpu time.
   67  */
   68 fixpt_t sched_pctcpu(struct kse *ke);
   69 
   70 /*
   71  * These procedures tell the process data structure allocation code how
   72  * many bytes to actually allocate.
   73  */
   74 int     sched_sizeof_kse(void);
   75 int     sched_sizeof_ksegrp(void);
   76 int     sched_sizeof_proc(void);
   77 int     sched_sizeof_thread(void);
   78 
   79 extern struct ke_sched *kse0_sched;
   80 extern struct kg_sched *ksegrp0_sched;
   81 extern struct p_sched *proc0_sched;
   82 extern struct td_sched *thread0_sched;
   83 
   84 #endif /* !_SYS_SCHED_H_ */

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