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Annotation of coherent/b/kernel/coh.386/timeout.c, revision 1.1

1.1     ! root        1: /* $Header: /src386/kernel/coh.386/RCS/timeout.c,v 1.3 93/04/16 06:50:21 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        !            12:  *     An unpublished work by Mark Williams Company, Chicago.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 1.3  93/04/16  06:50:21  bin
        !            21:  * Hal: kernel 76 update
        !            22:  * 
        !            23:  * Revision 1.4  93/04/14  10:08:12  root
        !            24:  * r75
        !            25:  * 
        !            26:  * Revision 1.3  92/07/16  16:33:38  hal
        !            27:  * Kernel #58
        !            28:  * 
        !            29:  * Revision 1.2  92/01/06  12:01:05  hal
        !            30:  * Compile with cc.mwc.
        !            31:  * 
        !            32:  * Revision 1.2        89/08/01  13:56:42      src
        !            33:  * Bug:        #include <timeout.h> not accurate; timeout.h now in /usr/include/sys.
        !            34:  * Fix:        #include <sys/timeout.h> now used. (ABC)
        !            35:  * 
        !            36:  * Revision 1.1        88/03/24  08:14:38      src
        !            37:  * Initial revision
        !            38:  * 
        !            39:  * 87/07/23    Allan Cornish           /usr/src/sys/coh/timeout.c
        !            40:  * Timeout2 function now cancels timer if delay value is 0.
        !            41:  *
        !            42:  * 87/07/08    Allan Cornish           /usr/src/sys/coh/timeout.c
        !            43:  * Timeout2 function added to support long timeouts.
        !            44:  *
        !            45:  * 87/07/07    Allan Cornish           /usr/src/sys/coh/timeout.c
        !            46:  * Support for multiple timing queues ported from RTX.
        !            47:  *
        !            48:  * 86/11/24    Allan Cornish           /usr/src/sys/coh/timeout.c
        !            49:  * Added support for new t_last field in tim struct.
        !            50:  */
        !            51: #include <sys/coherent.h>
        !            52: #include <sys/timeout.h>
        !            53: #include <sys/fun.h>
        !            54: 
        !            55: /*
        !            56:  * Given a pointer to a timeout structure, `tp', call the function `f'
        !            57:  * with integer argument `a' in `n' ticks of the clock. The list is
        !            58:  * searched to see if the specified timeout structure is already in a
        !            59:  * list, and it is removed if already there.
        !            60:  */
        !            61: void
        !            62: timeout(tp, n, f, a)
        !            63: register TIM *tp;
        !            64: unsigned n;
        !            65: int (*f)();
        !            66: char *a;
        !            67: {
        !            68:        register TIM ** qp;
        !            69:        int s;
        !            70: 
        !            71:        /*
        !            72:         * Already on a timing queue.
        !            73:         */
        !            74:        s = sphi();
        !            75:        if ( qp = tp->t_last ) {
        !            76:                tp->t_last = NULL;
        !            77:                if ( *qp = tp->t_next )
        !            78:                        tp->t_next->t_last = qp;
        !            79:        }
        !            80:        spl( s );
        !            81: 
        !            82:        if ( (tp->t_func = f) == NULL )
        !            83:                return;
        !            84: 
        !            85:        /*
        !            86:         * Calculate clock tick at which timeout is to occur.
        !            87:         * Record function and argument to be invoked upon timeout.
        !            88:         */
        !            89:        tp->t_lbolt = lbolt + n;
        !            90:        tp->t_farg  = a;
        !            91: 
        !            92:        /*
        !            93:         * Identify timeout queue.
        !            94:         */
        !            95:        qp = &timq[ tp->t_lbolt % nel(timq) ];
        !            96: 
        !            97:        /*
        !            98:         * Insert at head of timeout queue.
        !            99:         */
        !           100:        s = sphi();
        !           101:        if ( tp->t_next = *qp )
        !           102:                tp->t_next->t_last = tp;
        !           103:        tp->t_last = qp;
        !           104:        *qp = tp;
        !           105:        spl(s);
        !           106: }
        !           107: 
        !           108: void
        !           109: timeout2(tp, n, f, a)
        !           110: register TIM *tp;
        !           111: long n;
        !           112: int (*f)();
        !           113: char *a;
        !           114: {
        !           115:        register TIM ** qp;
        !           116:        int s;
        !           117: 
        !           118:        /*
        !           119:         * Already on a timing queue.
        !           120:         */
        !           121:        s = sphi();
        !           122:        if ( qp = tp->t_last ) {
        !           123:                tp->t_last = NULL;
        !           124:                if ( *qp = tp->t_next )
        !           125:                        tp->t_next->t_last = qp;
        !           126:        }
        !           127:        spl( s );
        !           128: 
        !           129:        /*
        !           130:         * Do not schedule new timer if no function or delay interval.
        !           131:         */
        !           132:        if ( (f == NULL) || (n == 0) )
        !           133:                return;
        !           134: 
        !           135:        /*
        !           136:         * Calculate clock tick at which timeout is to occur.
        !           137:         * Record function and argument to be invoked upon timeout.
        !           138:         */
        !           139:        tp->t_lbolt = lbolt + n;
        !           140:        tp->t_func  = f;
        !           141:        tp->t_farg  = a;
        !           142: 
        !           143:        /*
        !           144:         * Identify timeout queue.
        !           145:         */
        !           146:        qp = &timq[ tp->t_lbolt % nel(timq) ];
        !           147: 
        !           148:        /*
        !           149:         * Insert at head of timeout queue.
        !           150:         */
        !           151:        s = sphi();
        !           152:        if ( tp->t_next = *qp )
        !           153:                tp->t_next->t_last = tp;
        !           154:        tp->t_last = qp;
        !           155:        *qp = tp;
        !           156:        spl(s);
        !           157: }

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