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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1993,1994 The University of Utah and
        !             3:  * the Computer Systems Laboratory (CSL).  All rights reserved.
        !             4:  *
        !             5:  * Permission to use, copy, modify and distribute this software and its
        !             6:  * documentation is hereby granted, provided that both the copyright
        !             7:  * notice and this permission notice appear in all copies of the
        !             8:  * software, derivative works or modified versions, and any portions
        !             9:  * thereof, and that both notices appear in supporting documentation.
        !            10:  *
        !            11:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
        !            12:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
        !            13:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            14:  *
        !            15:  * CSL requests users of this software to return to [email protected] any
        !            16:  * improvements that they make and grant CSL redistribution rights.
        !            17:  *
        !            18:  *      Author: Bryan Ford, University of Utah CSL
        !            19:  */
        !            20: /*
        !            21:  *     File:   shuttle.h
        !            22:  *     Author: Bryan Ford
        !            23:  *
        !            24:  *     This file contains definitions for shuttles,
        !            25:  *     which handle microscheduling for individual threads.
        !            26:  *
        !            27:  */
        !            28: 
        !            29: #ifndef        _KERN_SHUTTLE_H_
        !            30: #define _KERN_SHUTTLE_H_
        !            31: 
        !            32: #include <kern/lock.h>
        !            33: 
        !            34: 
        !            35: 
        !            36: struct Shuttle {
        !            37:        /* XXX must be first in thread */
        !            38: /*
        !            39:  *     NOTE:   The runq field in the thread structure has an unusual
        !            40:  *     locking protocol.  If its value is RUN_QUEUE_NULL, then it is
        !            41:  *     locked by the thread_lock, but if its value is something else
        !            42:  *     (i.e. a run_queue) then it is locked by that run_queue's lock.
        !            43:  */
        !            44:        queue_chain_t   links;          /* current run queue links */
        !            45:        run_queue_t     runq;           /* run queue p is on SEE BELOW */
        !            46: 
        !            47:        /* Next pointer when on a queue */
        !            48:        struct Shuttle *next;
        !            49: 
        !            50:        /* Micropriority level */
        !            51:        int priority;
        !            52: 
        !            53:        /* General-purpose pointer field whose use depends on what the
        !            54:           thread happens to be doing */
        !            55:        void            *message;
        !            56: 
        !            57:        int foobar[1];
        !            58: };
        !            59: typedef struct Shuttle Shuttle;
        !            60: 
        !            61: 
        !            62: 
        !            63: /* Exported functions */
        !            64: 
        !            65: 
        !            66: 
        !            67: /* Machine-dependent code must define the following functions */
        !            68: 
        !            69: 
        !            70: 
        !            71: #endif _KERN_SHUTTLE_H_

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