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

     /* 
      * Mach Operating System
      * Copyright (c) 1993,1991,1990,1989,1988,1987 Carnegie Mellon University
      * All Rights Reserved.
      * 
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
      * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /*
     * HISTORY
     * $Log:        sched.h,v $
     * Revision 2.6  93/11/17  17:21:04  dbg
     *      Moved most functions to policy-specific routines.  This header
     *      file now describes the periodic scheduling events.
     *      [93/05/11            dbg]
     * 
     * Revision 2.5  91/05/14  16:46:04  mrt
     *      Correcting copyright
     * 
     * Revision 2.4  91/02/05  17:28:50  mrt
     *      Changed to new Mach copyright
     *      [91/02/01  16:16:37  mrt]
     * 
     * Revision 2.3  90/08/07  17:58:47  rpd
     *      Picked up fix to MACH_FIXPRI version of csw_needed.
     *      [90/08/07            rpd]
     * 
     * Revision 2.2  90/06/02  14:55:44  rpd
     *      Updated to new scheduling technology.
     *      [90/03/26  22:15:22  rpd]
     * 
     * Revision 2.1  89/08/03  15:52:50  rwd
     * Created.
     * 
     * 20-Oct-88  David Golub (dbg) at Carnegie-Mellon University
     *      Use macro_help to avoid lint.
     *
     * 11-Aug-88  David Black (dlb) at Carnegie-Mellon University
     *      Make csw_needed a macro here.  Ignore first_quantum for local_runq.
     *
     *  9-Aug-88  David Black (dlb) at Carnegie-Mellon University
     *      No more runrun.
     *
     * 18-May-88  David Black (dlb) at Carnegie-Mellon University
     *      Added shutdown queue for shutdown thread.
     *
     * 29-Mar-88  David Black (dlb) at Carnegie-Mellon University
     *      SIMPLE_CLOCK: added sched_usec for drift compensation.
     *
     * 25-Mar-88  David Black (dlb) at Carnegie-Mellon University
     *      Added sched_load and related constants.  Moved thread_timer_delta
     *      here because it depends on sched_load.
     *
     * 19-Feb-88  David Black (dlb) at Carnegie-Mellon University
     *      Added sched_tick and shift definitions for more flexible ageing.
     *
     * 18-Nov-87  Avadis Tevanian (avie) at Carnegie-Mellon University
     *      Removed conditionals, purged history.
     */
    /*
     *      File:   sched.h
     *      Author: Avadis Tevanian, Jr.
     *      Date:   1985
     *
     *      Periodic scheduling events.
     */
    
    #ifndef _KERN_SCHED_H_
    #define _KERN_SCHED_H_
    
    #include <simple_clock.h>
    
    /*
     *      sched_tick increments once a second.  Used to age priorities.
     */
    
    extern unsigned sched_tick;
    
    #if     SIMPLE_CLOCK
    /*
     *      sched_usec is an exponential average of number of microseconds
     *      in a second for clock drift compensation.
    */
   
   extern int      sched_usec;
   #endif  /* SIMPLE_CLOCK */
   
   /*
    *      Initialize the periodic scheduling calculations.
    */
   extern void     init_sched_calculations(void);
   
   #endif  /* _KERN_SCHED_H_ */

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