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Annotation of Net2/netccitt/pk_timer.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) University of British Columbia, 1984
        !             3:  * Copyright (c) 1990 The Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * the Laboratory for Computation Vision and the Computer Science Department
        !             8:  * of the University of British Columbia.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  *     @(#)pk_timer.c  7.5 (Berkeley) 5/29/91
        !            39:  */
        !            40: 
        !            41: #include "param.h"
        !            42: #include "systm.h"
        !            43: #include "mbuf.h"
        !            44: #include "socket.h"
        !            45: #include "protosw.h"
        !            46: #include "socketvar.h"
        !            47: #include "errno.h"
        !            48: 
        !            49: #include "../net/if.h"
        !            50: 
        !            51: #include "x25.h"
        !            52: #include "pk.h"
        !            53: #include "pk_var.h"
        !            54: 
        !            55: /*
        !            56:  * Various timer values.  They can be adjusted
        !            57:  * by patching the binary with adb if necessary.
        !            58:  */
        !            59: int    pk_t20 = 18 * PR_SLOWHZ;        /* restart timer */
        !            60: int    pk_t21 = 20 * PR_SLOWHZ;        /* call timer */
        !            61: /* XXX pk_t22 is never used */
        !            62: int    pk_t22 = 18 * PR_SLOWHZ;        /* reset timer */
        !            63: int    pk_t23 = 18 * PR_SLOWHZ;        /* clear timer */
        !            64: 
        !            65: pk_timer ()
        !            66: {
        !            67:        register struct pkcb *pkp;
        !            68:        register struct pklcd *lcp, **pp;
        !            69:        register int lcns_jammed, cant_restart;
        !            70: 
        !            71:        for (pkp = pkcbhead; pkp; pkp = pkp->pk_next) {
        !            72:                switch (pkp -> pk_state) {
        !            73:                case DTE_SENT_RESTART:
        !            74:                        lcp = pkp -> pk_chan[0];
        !            75:                        /*
        !            76:                         * If restart failures are common, a link level
        !            77:                         * reset should be initiated here.
        !            78:                         */
        !            79:                        if (lcp -> lcd_timer && --lcp -> lcd_timer == 0)
        !            80:                                pk_message (0, pkp -> pk_xcp,
        !            81:                                        "packet level restart failed");
        !            82:                        break;
        !            83: 
        !            84:                case DTE_READY:
        !            85:                        lcns_jammed = cant_restart = 0;
        !            86:                        for (pp = &pkp -> pk_chan[1]; pp <= &pkp -> pk_chan[pkp -> pk_maxlcn]; pp++) {
        !            87:                                if ((lcp = *pp) == 0)
        !            88:                                        continue;
        !            89:                                switch (lcp -> lcd_state) {
        !            90:                                case SENT_CALL: 
        !            91:                                        if (--lcp -> lcd_timer == 0) {
        !            92:                                            if (lcp -> lcd_so)
        !            93:                                                lcp -> lcd_so -> so_error = ETIMEDOUT;
        !            94:                                            pk_clear (lcp, 49, 1);
        !            95:                                        }
        !            96:                                        break;
        !            97: 
        !            98:                                case SENT_CLEAR: 
        !            99:                                        if (lcp -> lcd_retry >= 3)
        !           100:                                                lcns_jammed++;
        !           101:                                        else
        !           102:                                                if (--lcp -> lcd_timer == 0)
        !           103:                                                        pk_clear (lcp, 50, 1);
        !           104:                                        break;
        !           105: 
        !           106:                                case DATA_TRANSFER:     /* lcn active */
        !           107:                                        cant_restart++;
        !           108:                                        break;
        !           109:                                }
        !           110:                        }
        !           111:                        if (lcns_jammed > pkp -> pk_maxlcn / 2 && cant_restart == 0) {
        !           112:                                pk_message (0, pkp -> pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed);
        !           113:                                pk_restart (pkp, 0);
        !           114:                        }
        !           115:                }
        !           116:        }
        !           117: }

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