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Annotation of kernel/bsd/netat/adsp_TimerElem.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: 
        !            26: #include <adsp_local.h>
        !            27: atlock_t adsptmr_lock;
        !            28: 
        !            29: extern void DoTimerElem();     /* (TimerElemPtr t);  
        !            30:                                 * External routine called to 
        !            31:                                 * process each one. */
        !            32: 
        !            33: /*
        !            34:  * InsertTimerElem
        !            35:  * 
        !            36:  * INPUTS:
        !            37:  *     qhead           Address of ptr to first item in list
        !            38:  *     t               timer element to link in
        !            39:  *     vbl             timer value to use
        !            40:  * OUTPUTS:
        !            41:  *     void
        !            42:  */
        !            43: void InsertTimerElem(qhead, t, val)
        !            44:     /* (TimerElemPtr *qhead, TimerElemPtr t, word val) */
        !            45:     TimerElemPtr *qhead, t;
        !            46:     int val;
        !            47: {
        !            48:     TimerElemPtr p;            /* parent pointer */
        !            49:     TimerElemPtr n;            /* current */
        !            50:     int        s;
        !            51:        
        !            52:     ATDISABLE(s, adsptmr_lock);
        !            53:        
        !            54:     if (t->onQ) {
        !            55:         /*
        !            56:         * someone else beat us to the punch and put this
        !            57:         * element back on the queue, just return in this case
        !            58:         */
        !            59:         ATENABLE(s, adsptmr_lock);
        !            60:        return;
        !            61:     }
        !            62:     p = (TimerElemPtr)qhead;
        !            63: 
        !            64:     while (n = p->link) {
        !            65:        if (val <= n->timer)    /* Do we go in front of this? */
        !            66:        {
        !            67:            n->timer -= val;    /* Yes, adjust his delta */
        !            68:            break;              /* and go link us in */
        !            69:        }
        !            70:        val -= n->timer;        /* No, subtract off delta from our value */
        !            71:        p = n;
        !            72:     }                          /* while */
        !            73:        
        !            74:     /* It must go after item pointed to by p and in front of item 
        !            75:      * pointed to by n */
        !            76: 
        !            77:     t->onQ = 1;        /* we're linked in now */
        !            78:     p->link = t;               /* parent points to us */
        !            79:     t->timer = val;            /* this is our value */
        !            80:     t->link = n;               /* we point to n */
        !            81:     
        !            82:     ATENABLE(s, adsptmr_lock);
        !            83: }
        !            84: 
        !            85: 
        !            86: /*
        !            87:  * RemoveTimerElem
        !            88:  * 
        !            89:  * INPUTS:
        !            90:  *     qhead           Address of ptr to first item in list
        !            91:  *     t               timer element to link in
        !            92:  * OUTPUTS:
        !            93:  *     void
        !            94:  */
        !            95: void RemoveTimerElem(qhead, t) /* (TimerElemPtr *qhead, TimerElemPtr t) */
        !            96:     TimerElemPtr *qhead, t;
        !            97: {
        !            98:     TimerElemPtr p;            /* parent pointer */
        !            99:     TimerElemPtr n;            /* current */
        !           100:     int        s;
        !           101:        
        !           102:     ATDISABLE(s, adsptmr_lock);
        !           103:        
        !           104:     if ( !t->onQ) {
        !           105:         /*
        !           106:         * someone else beat us to the punch and took this
        !           107:         * element off of the queue, just return in this case
        !           108:         */
        !           109:         ATENABLE(s, adsptmr_lock);
        !           110:        return;
        !           111:     }
        !           112:     p = (TimerElemPtr)qhead;
        !           113: 
        !           114:     while (n = p->link)        /* Get next item in queue */
        !           115:     {
        !           116:        if (n == t)             /* Is it us? */
        !           117:        {
        !           118:            if (p->link = n->link) /* Link our parent to our child */
        !           119:            {
        !           120:                n->link->timer += t->timer; /* and update child's timer */
        !           121:            }
        !           122:            n->onQ = 0;         /* Not on linked list anymore */
        !           123:            break;
        !           124:        }
        !           125:        p = n;
        !           126:     }                          /* while */
        !           127:        
        !           128:     ATENABLE(s, adsptmr_lock);
        !           129: }
        !           130: 
        !           131: 
        !           132: /*
        !           133:  * TimerQueueTick
        !           134:  * 
        !           135:  * INPUTS:
        !           136:  *     qhead           Address of ptr to first item in list
        !           137:  *     
        !           138:  * OUTPUTS:
        !           139:  *     void
        !           140:  */
        !           141: void TimerQueueTick(qhead)     /* (TimerElemPtr *qhead) */
        !           142:     TimerElemPtr *qhead;
        !           143: {
        !           144:     TimerElemPtr p;            /* parent pointer */
        !           145:     TimerElemPtr n;            /* current */
        !           146:     int        s;
        !           147:        
        !           148:     ATDISABLE(s, adsptmr_lock);
        !           149:        
        !           150:     p = (TimerElemPtr)qhead;
        !           151:     if (p->link)               /* Is anything on queue? */
        !           152:        p->link->timer--;       /* Yes, decrement by a tick */
        !           153:     else
        !           154:        goto done;              /* No, we're outta' here */
        !           155:                
        !           156:     while ((n = p->link) && 
        !           157:           (n->timer == 0)) /* Next guy needs to be serviced */
        !           158:     {
        !           159:        p->link = n->link;      /* Unlink us */
        !           160:        n->onQ  = 0;
        !           161: 
        !           162:        ATENABLE(s, adsptmr_lock);
        !           163:        DoTimerElem(n);
        !           164:        ATDISABLE(s, adsptmr_lock);
        !           165: 
        !           166:        p = (TimerElemPtr)qhead;
        !           167:     }                          /* while */
        !           168:        
        !           169: done:
        !           170:     ATENABLE(s, adsptmr_lock);
        !           171: }

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