NetBSD/usr.sbin/mrouted/callout.c

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/* $NetBSD: callout.c,v 1.3 1995/12/10 10:06:56 mycroft Exp $ */
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/*
* The mrouted program is covered by the license in the accompanying file
* named "LICENSE". Use of the mrouted program represents acceptance of
* the terms and conditions listed in that file.
*
* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
* Leland Stanford Junior University.
*/
#include "defs.h"
/* the code below implements a callout queue */
static int id = 0;
static struct timeout_q *Q = 0; /* pointer to the beginning of timeout queue */
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static int in_callout = 0;
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struct timeout_q {
struct timeout_q *next; /* next event */
int id;
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cfunc_t func; /* function to call */
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char *data; /* func's data */
int time; /* time offset to next event*/
};
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#ifdef IGMP_DEBUG
static void print_Q __P((void));
#else
#define print_Q()
#endif
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void
callout_init()
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{
Q = (struct timeout_q *) 0;
}
/*
* signal handler for SIGALARM that is called once every second
*/
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void
age_callout_queue()
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{
struct timeout_q *ptr;
if (in_callout)
return;
in_callout = 1;
ptr = Q;
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while (ptr) {
if (!ptr->time) {
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/* timeout has happened */
Q = Q->next;
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in_callout = 0;
if (ptr->func)
ptr->func(ptr->data);
in_callout = 1;
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free(ptr);
ptr = Q;
}
else {
ptr->time --;
#ifdef IGMP_DEBUG
log(LOG_DEBUG,0,"[callout, age_callout_queue] -- time (%d)", ptr->time);
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#endif /* IGMP_DEBUG */
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in_callout = 0; return;
}
}
in_callout = 0;
return;
}
/*
* sets the timer
*/
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int
timer_setTimer(delay, action, data)
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int delay; /* number of units for timeout */
cfunc_t action; /* function to be called on timeout */
char *data; /* what to call the timeout function with */
{
struct timeout_q *ptr, *node, *prev;
if (in_callout)
return -1;
in_callout = 1;
/* create a node */
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node = (struct timeout_q *)malloc(sizeof(struct timeout_q));
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if (node == 0) {
log(LOG_WARNING, 0, "Malloc Failed in timer_settimer\n");
in_callout = 0;
return -1;
}
node->func = action;
node->data = data;
node->time = delay;
node->next = 0;
node->id = ++id;
prev = ptr = Q;
/* insert node in the queue */
/* if the queue is empty, insert the node and return */
if (!Q)
Q = node;
else {
/* chase the pointer looking for the right place */
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while (ptr) {
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if (delay < ptr->time) {
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/* right place */
node->next = ptr;
if (ptr == Q)
Q = node;
else
prev->next = node;
ptr->time -= node->time;
print_Q();
in_callout = 0;
return node->id;
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} else {
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/* keep moving */
delay -= ptr->time; node->time = delay;
prev = ptr;
ptr = ptr->next;
}
}
prev->next = node;
}
print_Q();
in_callout = 0;
return node->id;
}
/* clears the associated timer */
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void
timer_clearTimer(timer_id)
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int timer_id;
{
struct timeout_q *ptr, *prev;
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if (in_callout)
return;
if (!timer_id)
return;
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in_callout = 1;
prev = ptr = Q;
/*
* find the right node, delete it. the subsequent node's time
* gets bumped up
*/
print_Q();
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while (ptr) {
if (ptr->id == timer_id) {
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/* got the right node */
/* unlink it from the queue */
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if (ptr == Q)
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Q = Q->next;
else
prev->next = ptr->next;
/* increment next node if any */
if (ptr->next != 0)
(ptr->next)->time += ptr->time;
free(ptr->data);
free(ptr);
print_Q();
in_callout = 0;
return;
}
prev = ptr;
ptr = ptr->next;
}
print_Q();
in_callout = 0;
}
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#ifdef IGMP_DEBUG
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/*
* debugging utility
*/
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static void
print_Q()
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{
struct timeout_q *ptr;
for(ptr = Q; ptr; ptr = ptr->next)
log(LOG_DEBUG,0,"(%d,%d) ", ptr->id, ptr->time);
}
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#endif /* IGMP_DEBUG */
int
secs_remaining( timer_id)
int timer_id;
{
struct timeout_q *ptr;
int left=0;
for (ptr = Q; ptr && ptr->id != timer_id; ptr = ptr->next)
left += ptr->time;
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if (!ptr) /* not found */
return 0;
return left + ptr->time;
}