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/kern/quantum.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1993 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon 
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        quantum.h,v $
   29  * Revision 2.2  93/11/17  17:19:18  dbg
   30  *      Created.
   31  *      [93/05/11            dbg]
   32  * 
   33  */
   34 
   35 #ifndef _KERN_QUANTUM_H_
   36 #define _KERN_QUANTUM_H_
   37 
   38 #include <kern/kern_types.h>
   39 
   40 /*
   41  *      Routines to perform quantum adjustment.
   42  */
   43 extern int      min_quantum;            /* maximum context switch rate,
   44                                            in microseconds */
   45 
   46 /*
   47  *      Precalculate the quanta for a processor set.
   48  */
   49 extern void quantum_set(
   50         processor_set_t pset);
   51 
   52 /*
   53  *      Recalculate quantum (and thread priority) at
   54  *      each clock tick.
   55  */
   56 void clock_quantum_update(
   57         thread_t        thread,
   58         int             mycpu,
   59         unsigned int    usecs);
   60 
   61 #endif  /* _KERN_QUANTUM_H_ */

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