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: src/sys/sys/sched.h,v 1.14.2.5 2004/09/18 04:11:36 julian Exp $
   27  */
   28 
   29 #ifndef _SYS_SCHED_H_
   30 #define _SYS_SCHED_H_
   31 
   32 /*
   33  * General scheduling info.
   34  *
   35  * sched_load:
   36  *      Total runnable non-ithread threads in the system.
   37  *
   38  * sched_runnable:
   39  *      Runnable threads for this processor.
   40  */
   41 int     sched_load(void);
   42 int     sched_rr_interval(void);
   43 int     sched_runnable(void);
   44 
   45 /* 
   46  * Proc related scheduling hooks.
   47  */
   48 void    sched_exit(struct proc *p, struct thread *childtd);
   49 void    sched_fork(struct thread *td, struct thread *childtd);
   50 
   51 /*
   52  * KSE Groups contain scheduling priority information.  They record the
   53  * behavior of groups of KSEs and threads.
   54  */
   55 void    sched_class(struct ksegrp *kg, int class);
   56 void    sched_exit_ksegrp(struct ksegrp *kg, struct thread *childtd);
   57 void    sched_fork_ksegrp(struct thread *td, struct ksegrp *child);
   58 void    sched_nice(struct proc *p, int nice);
   59 
   60 /*
   61  * Threads are switched in and out, block on resources, have temporary
   62  * priorities inherited from their ksegs, and use up cpu time.
   63  */
   64 void    sched_exit_thread(struct thread *td, struct thread *child);
   65 void    sched_fork_thread(struct thread *td, struct thread *child);
   66 fixpt_t sched_pctcpu(struct thread *td);
   67 void    sched_prio(struct thread *td, u_char prio);
   68 void    sched_sleep(struct thread *td);
   69 void    sched_switch(struct thread *td, struct thread *newtd, int flags);
   70 void    sched_userret(struct thread *td);
   71 void    sched_wakeup(struct thread *td);
   72 
   73 /*
   74  * Threads are moved on and off of run queues
   75  */
   76 void    sched_add(struct thread *td, int flags);
   77 void    sched_clock(struct thread *td);
   78 void    sched_rem(struct thread *td);
   79 
   80 /*
   81  * Binding makes cpu affinity permanent while pinning is used to temporarily
   82  * hold a thread on a particular CPU.
   83  */
   84 void    sched_bind(struct thread *td, int cpu);
   85 static __inline void sched_pin(void);
   86 void    sched_unbind(struct thread *td);
   87 static __inline void sched_unpin(void);
   88 
   89 /*
   90  * These procedures tell the process data structure allocation code how
   91  * many bytes to actually allocate.
   92  */
   93 int     sched_sizeof_ksegrp(void);
   94 int     sched_sizeof_proc(void);
   95 int     sched_sizeof_thread(void);
   96 
   97 static __inline void
   98 sched_pin(void)
   99 {
  100         curthread->td_pinned++;
  101 }
  102 
  103 static __inline void
  104 sched_unpin(void)
  105 {
  106         curthread->td_pinned--;
  107 }
  108 
  109 /* temporarily here */
  110 void schedinit(void);
  111 void sched_destroyproc(struct proc *p);
  112 void sched_init_concurrency(struct ksegrp *kg);
  113 void sched_set_concurrency(struct ksegrp *kg, int cuncurrency);
  114 void sched_schedinit(void);
  115 void sched_newproc(struct proc *p, struct ksegrp *kg, struct thread *td);
  116 void sched_thread_exit(struct thread *td);
  117 void sched_newthread(struct thread *td);
  118 #endif /* !_SYS_SCHED_H_ */

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