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Annotation of OSKit-Mach/kern/sched.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1991,1990,1989,1988,1987 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  [email protected]
        !            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:  *     File:   sched.h
        !            28:  *     Author: Avadis Tevanian, Jr.
        !            29:  *     Date:   1985
        !            30:  *
        !            31:  *     Header file for scheduler.
        !            32:  *
        !            33:  */
        !            34: 
        !            35: #ifndef        _KERN_SCHED_H_
        !            36: #define _KERN_SCHED_H_
        !            37: 
        !            38: #include <cpus.h>
        !            39: #include <mach_fixpri.h>
        !            40: #include <simple_clock.h>
        !            41: #include <stat_time.h>
        !            42: 
        !            43: #include <kern/queue.h>
        !            44: #include <kern/lock.h>
        !            45: #include <kern/macro_help.h>
        !            46: 
        !            47: #if    MACH_FIXPRI
        !            48: #include <mach/policy.h>
        !            49: #endif /* MACH_FIXPRI */
        !            50: 
        !            51: #if    STAT_TIME
        !            52: 
        !            53: /*
        !            54:  *     Statistical timing uses microseconds as timer units.  18 bit shift
        !            55:  *     yields priorities.  PRI_SHIFT_2 isn't needed.
        !            56:  */
        !            57: #define PRI_SHIFT      18
        !            58: 
        !            59: #else  /* STAT_TIME */
        !            60: 
        !            61: /*
        !            62:  *     Otherwise machine provides shift(s) based on time units it uses.
        !            63:  */
        !            64: #include <machine/sched_param.h>
        !            65: 
        !            66: #endif /* STAT_TIME */
        !            67: #define NRQS   32                      /* 32 run queues per cpu */
        !            68: 
        !            69: struct run_queue {
        !            70:        queue_head_t            runq[NRQS];     /* one for each priority */
        !            71:        decl_simple_lock_data(, lock)           /* one lock for all queues */
        !            72:        int                     low;            /* low queue value */
        !            73:        int                     count;          /* count of threads runable */
        !            74: };
        !            75: 
        !            76: typedef struct run_queue       *run_queue_t;
        !            77: #define RUN_QUEUE_NULL ((run_queue_t) 0)
        !            78: 
        !            79: #if    MACH_FIXPRI
        !            80: /*
        !            81:  *     NOTE: For fixed priority threads, first_quantum indicates
        !            82:  *     whether context switch at same priority is ok.  For timeshareing
        !            83:  *     it indicates whether preempt is ok.
        !            84:  */
        !            85: 
        !            86: #define csw_needed(thread, processor) ((thread)->state & TH_SUSP ||    \
        !            87:        ((processor)->runq.count > 0) ||                                \
        !            88:        ((thread)->policy == POLICY_TIMESHARE &&                        \
        !            89:                (processor)->first_quantum == FALSE &&                  \
        !            90:                (processor)->processor_set->runq.count > 0 &&           \
        !            91:                  (processor)->processor_set->runq.low <=               \
        !            92:                        (thread)->sched_pri) ||                         \
        !            93:        ((thread)->policy == POLICY_FIXEDPRI &&                         \
        !            94:                (processor)->processor_set->runq.count > 0 &&           \
        !            95:                 ((((processor)->first_quantum == FALSE) &&             \
        !            96:                  ((processor)->processor_set->runq.low <=              \
        !            97:                        (thread)->sched_pri)) ||                        \
        !            98:                 ((processor)->processor_set->runq.low <                \
        !            99:                        (thread)->sched_pri))))
        !           100: 
        !           101: #else  /* MACH_FIXPRI */
        !           102: #define csw_needed(thread, processor) ((thread)->state & TH_SUSP ||    \
        !           103:                ((processor)->runq.count > 0) ||                        \
        !           104:                ((processor)->first_quantum == FALSE &&                 \
        !           105:                 ((processor)->processor_set->runq.count > 0 &&         \
        !           106:                  (processor)->processor_set->runq.low <=               \
        !           107:                        ((thread)->sched_pri))))
        !           108: #endif /* MACH_FIXPRI */
        !           109: 
        !           110: /*
        !           111:  *     Scheduler routines.
        !           112:  */
        !           113: 
        !           114: extern struct run_queue        *rem_runq();
        !           115: extern struct thread   *choose_thread();
        !           116: extern queue_head_t    action_queue;   /* assign/shutdown queue */
        !           117: decl_simple_lock_data(extern,action_lock);
        !           118: 
        !           119: extern int             min_quantum;    /* defines max context switch rate */
        !           120: 
        !           121: /*
        !           122:  *     Default base priorities for threads.
        !           123:  */
        !           124: #define BASEPRI_SYSTEM 6
        !           125: #define BASEPRI_USER   12
        !           126: 
        !           127: /*
        !           128:  *     Macro to check for invalid priorities.
        !           129:  */
        !           130: 
        !           131: #define invalid_pri(pri) (((pri) < 0) || ((pri) >= NRQS))
        !           132: 
        !           133: /*
        !           134:  *     Shift structures for holding update shifts.  Actual computation
        !           135:  *     is  usage = (usage >> shift1) +/- (usage >> abs(shift2))  where the
        !           136:  *     +/- is determined by the sign of shift 2.
        !           137:  */
        !           138: struct shift {
        !           139:        int     shift1;
        !           140:        int     shift2;
        !           141: };
        !           142: 
        !           143: typedef        struct shift    *shift_t, shift_data_t;
        !           144: 
        !           145: /*
        !           146:  *     sched_tick increments once a second.  Used to age priorities.
        !           147:  */
        !           148: 
        !           149: extern unsigned        sched_tick;
        !           150: 
        !           151: #define SCHED_SCALE    128
        !           152: #define SCHED_SHIFT    7
        !           153: 
        !           154: /*
        !           155:  *     thread_timer_delta macro takes care of both thread timers.
        !           156:  */
        !           157: 
        !           158: #define thread_timer_delta(thread)                             \
        !           159: MACRO_BEGIN                                                    \
        !           160:        register unsigned       delta;                          \
        !           161:                                                                \
        !           162:        delta = 0;                                              \
        !           163:        TIMER_DELTA((thread)->system_timer,                     \
        !           164:                (thread)->system_timer_save, delta);            \
        !           165:        TIMER_DELTA((thread)->user_timer,                       \
        !           166:                (thread)->user_timer_save, delta);              \
        !           167:        (thread)->cpu_delta += delta;                           \
        !           168:        (thread)->sched_delta += delta *                        \
        !           169:                        (thread)->processor_set->sched_load;    \
        !           170: MACRO_END
        !           171: 
        !           172: #if    SIMPLE_CLOCK
        !           173: /*
        !           174:  *     sched_usec is an exponential average of number of microseconds
        !           175:  *     in a second for clock drift compensation.
        !           176:  */
        !           177: 
        !           178: extern int     sched_usec;
        !           179: #endif /* SIMPLE_CLOCK */
        !           180: 
        !           181: #endif /* _KERN_SCHED_H_ */

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