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Annotation of coherent/d/kernel/USRSRC/coh/timeout.c, revision 1.1

1.1     ! root        1: /* $Header: /newbits/kernel/USRSRC/coh/RCS/timeout.c,v 1.4 91/07/24 07:52:49 bin Exp Locker: bin $ */
        !             2: /* (lgl-
        !             3:  *     The information contained herein is a trade secret of Mark Williams
        !             4:  *     Company, and  is confidential information.  It is provided  under a
        !             5:  *     license agreement,  and may be  copied or disclosed  only under the
        !             6:  *     terms of  that agreement.  Any  reproduction or disclosure  of this
        !             7:  *     material without the express written authorization of Mark Williams
        !             8:  *     Company or persuant to the license agreement is unlawful.
        !             9:  *
        !            10:  *     COHERENT Version 2.3.37
        !            11:  *     Copyright (c) 1982, 1983, 1984.
        !            12:  *     An unpublished work by Mark Williams Company, Chicago.
        !            13:  *     All rights reserved.
        !            14:  -lgl) */
        !            15: /*
        !            16:  * Coherent.
        !            17:  * Timeout management.
        !            18:  *
        !            19:  * $Log:       timeout.c,v $
        !            20:  * Revision 1.4  91/07/24  07:52:49  bin
        !            21:  * update prov by hal
        !            22:  * 
        !            23:  * 
        !            24:  * Revision 1.2        89/08/01  13:56:42      src
        !            25:  * Bug:        #include <timeout.h> not accurate; timeout.h now in /usr/include/sys.
        !            26:  * Fix:        #include <sys/timeout.h> now used. (ABC)
        !            27:  * 
        !            28:  * Revision 1.1        88/03/24  08:14:38      src
        !            29:  * Initial revision
        !            30:  * 
        !            31:  * 87/07/23    Allan Cornish           /usr/src/sys/coh/timeout.c
        !            32:  * Timeout2 function now cancels timer if delay value is 0.
        !            33:  *
        !            34:  * 87/07/08    Allan Cornish           /usr/src/sys/coh/timeout.c
        !            35:  * Timeout2 function added to support long timeouts.
        !            36:  *
        !            37:  * 87/07/07    Allan Cornish           /usr/src/sys/coh/timeout.c
        !            38:  * Support for multiple timing queues ported from RTX.
        !            39:  *
        !            40:  * 86/11/24    Allan Cornish           /usr/src/sys/coh/timeout.c
        !            41:  * Added support for new t_last field in tim struct.
        !            42:  */
        !            43: #include <sys/coherent.h>
        !            44: #include <sys/timeout.h>
        !            45: #include <sys/fun.h>
        !            46: 
        !            47: /*
        !            48:  * Given a pointer to a timeout structure, `tp', call the function `f'
        !            49:  * with integer argument `a' in `n' ticks of the clock. The list is
        !            50:  * searched to see if the specified timeout structure is already in a
        !            51:  * list, and it is removed if already there.
        !            52:  */
        !            53: timeout(tp, n, f, a)
        !            54: register TIM *tp;
        !            55: unsigned n;
        !            56: int (*f)();
        !            57: char *a;
        !            58: {
        !            59:        register TIM ** qp;
        !            60:        int s;
        !            61: 
        !            62:        /*
        !            63:         * Already on a timing queue.
        !            64:         */
        !            65:        s = sphi();
        !            66:        if ( qp = tp->t_last ) {
        !            67:                tp->t_last = NULL;
        !            68:                if ( *qp = tp->t_next )
        !            69:                        tp->t_next->t_last = qp;
        !            70:        }
        !            71:        spl( s );
        !            72: 
        !            73:        if ( f == NULL )
        !            74:                return;
        !            75: 
        !            76:        /*
        !            77:         * Calculate clock tick at which timeout is to occur.
        !            78:         * Record function and argument to be invoked upon timeout.
        !            79:         */
        !            80:        tp->t_lbolt = lbolt + n;
        !            81:        tp->t_func  = f;
        !            82:        tp->t_farg  = a;
        !            83: 
        !            84:        /*
        !            85:         * Identify timeout queue.
        !            86:         */
        !            87:        qp = &timq[ tp->t_lbolt % nel(timq) ];
        !            88: 
        !            89:        /*
        !            90:         * Insert at head of timeout queue.
        !            91:         */
        !            92:        s = sphi();
        !            93:        if ( tp->t_next = *qp )
        !            94:                tp->t_next->t_last = tp;
        !            95:        tp->t_last = qp;
        !            96:        *qp = tp;
        !            97:        spl(s);
        !            98: }
        !            99: 
        !           100: timeout2(tp, n, f, a)
        !           101: register TIM *tp;
        !           102: long n;
        !           103: int (*f)();
        !           104: char *a;
        !           105: {
        !           106:        register TIM ** qp;
        !           107:        int s;
        !           108: 
        !           109:        /*
        !           110:         * Already on a timing queue.
        !           111:         */
        !           112:        s = sphi();
        !           113:        if ( qp = tp->t_last ) {
        !           114:                tp->t_last = NULL;
        !           115:                if ( *qp = tp->t_next )
        !           116:                        tp->t_next->t_last = qp;
        !           117:        }
        !           118:        spl( s );
        !           119: 
        !           120:        /*
        !           121:         * Do not schedule new timer if no function or delay interval.
        !           122:         */
        !           123:        if ( (f == NULL) || (n == 0) )
        !           124:                return;
        !           125: 
        !           126:        /*
        !           127:         * Calculate clock tick at which timeout is to occur.
        !           128:         * Record function and argument to be invoked upon timeout.
        !           129:         */
        !           130:        tp->t_lbolt = lbolt + n;
        !           131:        tp->t_func  = f;
        !           132:        tp->t_farg  = a;
        !           133: 
        !           134:        /*
        !           135:         * Identify timeout queue.
        !           136:         */
        !           137:        qp = &timq[ tp->t_lbolt % nel(timq) ];
        !           138: 
        !           139:        /*
        !           140:         * Insert at head of timeout queue.
        !           141:         */
        !           142:        s = sphi();
        !           143:        if ( tp->t_next = *qp )
        !           144:                tp->t_next->t_last = tp;
        !           145:        tp->t_last = qp;
        !           146:        *qp = tp;
        !           147:        spl(s);
        !           148: }

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