FreeBSD/Linux Kernel Cross Reference
sys/mach/policy.h

     /* 
      * Mach Operating System
      * Copyright (c) 1993,1991,1990,1989,1988 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:        policy.h,v $
     * Revision 2.6  93/11/17  17:43:48  dbg
     *      Moved names for real-time policies to mach/realtime_policy.h.
     *      Added common scheduling attributes for background, timesharing,
     *      fixed-priority policies.
     *      [93/05/10            dbg]
     * 
     *      Added real-time and background policies.
     *      [93/04/09            dbg]
     * 
     * Revision 2.5  93/01/14  17:46:25  danner
     *      Cleanup.
     *      [92/06/10            pds]
     * 
     * Revision 2.4  91/05/14  16:58:29  mrt
     *      Correcting copyright
     * 
     * Revision 2.3  91/02/05  17:35:22  mrt
     *      Changed to new Mach copyright
     *      [91/02/01  17:20:11  mrt]
     * 
     * Revision 2.2  90/06/02  14:59:37  rpd
     *      Created for new host/processor technology.
     *      [90/03/26  23:51:22  rpd]
     * 
     *      Cleanup changes.
     *      [89/08/02            dlb]
     *      Created.
     *      [89/07/25  18:47:00  dlb]
     * 
     * Revision 2.3  89/10/15  02:05:50  rpd
     *      Minor cleanups.
     * 
     * Revision 2.2  89/10/11  14:40:53  dlb
     *      Cleanup changes.
     *      [89/08/02            dlb]
     * 
     */
    
    #ifndef _MACH_POLICY_H_
    #define _MACH_POLICY_H_
    
    /*
     *      mach/policy.h
     *
     *      Definitions for scheduing policy.
     */
    #include <mach/machine/vm_types.h>      /* for integer_t */
    
    #define POLICY_BACKGROUND               0
    #define POLICY_TIMESHARE                1
    #define POLICY_FIXEDPRI                 2
    
    /*
     *      Parameters and limits for standard policies.
     */
    typedef natural_t       *policy_param_t;
                                            /* varying array of unsigned integers */
    #define POLICY_PARAM_MAX_COUNT  (1024)  /* maximum array size */
    
    /*
     *      Background threads have no parameters or limit values.
     */
    
    /*
     *      Timesharing threads:
     *
     *      Policy parameter and limit values include only the
     *      base priority for the thread.
     */
    struct policy_param_timeshare {
            natural_t       priority;       /* base priority for thread */
   };
   #define POLICY_PARAM_TIMESHARE_COUNT \
           (sizeof(struct policy_param_timeshare)/sizeof(natural_t))
   
   /*
    *      Information for timesharing threads includes
    *      the base, current, and maximum (limit) priorities.
    */
   struct policy_info_timeshare {
           natural_t       base_priority;  /* base priority */
           natural_t       cur_priority;   /* current priority, including
                                              aging */
           natural_t       max_priority;   /* maximum priority allowed */
   };
   #define POLICY_INFO_TIMESHARE_COUNT \
           (sizeof(struct policy_info_timeshare)/sizeof(natural_t))
   
   /*
    *      Fixed-priority threads:
    *
    *      Policy parameters include the priority, and
    *      whether the thread is preemptible by others at
    *      the same priority.
    */
   struct policy_param_fixedpri {
           natural_t       priority;       /* priority of thread */
           /* boolean_t */
               natural_t   no_preempt;     /* TRUE for non-preemptive
                                              (FIFO) scheduling
                                              FALSE for preemptinve
                                              (round-robin) scheduling */
   };
   #define POLICY_PARAM_FIXEDPRI_COUNT \
           (sizeof(struct policy_param_fixedpri)/sizeof(natural_t))
   
   /*
    *      Info for fixed-priority threads also includes the
    *      maximum allowed priority.
    */
   struct policy_info_fixedpri {
           natural_t       priority;
           /* boolean_t */
               natural_t   no_preempt;
           natural_t       max_priority;
   };
   #define POLICY_INFO_FIXEDPRI_COUNT \
           (sizeof(struct policy_info_fixedpri)/sizeof(natural_t))
   
   #endif /* _MACH_POLICY_H_ */

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