timer.c revision 6060 
1/*
2 *		PPP Timer Processing Module
3 *
4 *	    Written by Toshiharu OHNO (tony-o@iij.ad.jp)
5 *
6 *   Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
7 *
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by the Internet Initiative Japan, Inc.  The name of the
14 * IIJ may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 *
20 * $Id:$
21 *
22 *  TODO:
23 */
24#include "defs.h"
25#include <sys/time.h>
26#include <signal.h>
27#include "timeout.h"
28
29void
30StartTimer(tp)
31struct pppTimer *tp;
32{
33  struct pppTimer *t, *pt;
34  u_long ticks = 0;
35
36  if (tp->state == TIMER_RUNNING) {
37    StopTimer(tp);
38  }
39  if (tp->load == 0) {
40#ifdef DEBUG
41    logprintf("timer %x has 0 load!\n", tp);
42#endif
43    return;
44  }
45  pt = NULL;
46  for (t = TimerList; t; t = t->next) {
47#ifdef DEBUG
48    logprintf("%x(%d):  ticks: %d, rest: %d\n", t, t->state, ticks, t->rest);
49#endif
50    if (ticks + t->rest >= tp->load)
51      break;
52    ticks += t->rest;
53    pt = t;
54  }
55
56  tp->state = TIMER_RUNNING;
57  tp->rest = tp->load - ticks;
58#ifdef DEBUG
59  logprintf("Inserting %x before %x, rest = %d\n", tp, t, tp->rest);
60#endif
61  /* Insert given *tp just before *t */
62  tp->next = t;
63  if (pt) {
64    pt->next = tp;
65  } else
66    TimerList = tp;
67  if (t)
68    t->rest -= tp->rest;
69}
70
71void
72StopTimer(tp)
73struct pppTimer *tp;
74{
75  struct pppTimer *t, *pt;
76
77  if (tp->state != TIMER_RUNNING) {
78    tp->next = NULL;
79    return;
80  }
81
82#ifdef DEBUG
83  logprintf("StopTimer: %x, next = %x\n", tp, tp->next);
84#endif
85  pt = NULL;
86  for (t = TimerList; t != tp; t = t->next)
87    pt = t;
88  if (t) {
89    if (pt)
90      pt->next = t->next;
91    else
92      TimerList = t->next;
93    if (t->next)
94      t->next->rest += tp->rest;
95  } else
96    fprintf(stderr, "Oops, timer not found!!\n");
97  tp->next = NULL;
98  tp->state = TIMER_STOPPED;
99}
100
101void
102TimerService()
103{
104  struct pppTimer *tp, *exp, *wt;
105
106  if (tp = TimerList) {
107    tp->rest--;
108    if (tp->rest == 0) {
109      /*
110       * Multiple timers may expires at once. Create list of expired timers.
111       */
112      exp = NULL;
113      do {
114	tp->state = TIMER_EXPIRED;
115	wt = tp->next;
116	tp->enext = exp;
117	exp = tp;
118#ifdef DEBUG
119	logprintf("Add %x to exp\n", tp);
120#endif
121	tp = wt;
122      } while (tp && (tp->rest == 0));
123
124      TimerList = tp;
125#ifdef DEBUG
126      logprintf("TimerService: next is %x(%d)\n",
127		TimerList, TimerList? TimerList->rest : 0);
128#endif
129      /*
130       * Process all expired timers.
131       */
132      while (exp) {
133#ifdef notdef
134	StopTimer(exp);
135#endif
136	if (exp->func)
137	  (*exp->func)(exp->arg);
138	exp = exp->enext;
139      }
140    }
141  }
142}
143
144void
145ShowTimers()
146{
147  struct pppTimer *pt;
148
149  for (pt = TimerList; pt; pt = pt->next)
150    fprintf(stderr, "%x: load = %d, rest = %d\r\n", pt, pt->load, pt->rest);
151}
152