tinc/src/event.c

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/*
event.c -- event queue
Copyright (C) 2002 Guus Sliepen <guus@sliepen.eu.org>,
2002 Ivo Timmermans <ivo@o2w.nl>
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This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: event.c,v 1.1.4.4 2002/09/09 19:39:58 guus Exp $
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*/
#include "config.h"
#include <stdlib.h>
#include <xalloc.h>
#include <string.h>
#include <utils.h>
#include <avl_tree.h>
#include <time.h>
#include "event.h"
#include "system.h"
avl_tree_t *event_tree;
extern time_t now;
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int id;
int event_compare(event_t *a, event_t *b)
{
if(a->time > b->time)
return 1;
if(a->time < b->time)
return -1;
return a->id - b->id;
}
void init_events(void)
{
cp();
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event_tree = avl_alloc_tree((avl_compare_t)event_compare, NULL);
cp();
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}
void exit_events(void)
{
cp();
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avl_delete_tree(event_tree);
cp();
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}
event_t *new_event(void)
{
event_t *event;
cp();
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event = (event_t *)xmalloc_and_zero(sizeof(*event));
cp();
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return event;
}
void free_event(event_t *event)
{
cp();
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free(event);
cp();
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}
void event_add(event_t *event)
{
cp();
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event->id = ++id;
avl_insert(event_tree, event);
cp();
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}
void event_del(event_t *event)
{
cp();
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avl_delete(event_tree, event);
cp();
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}
event_t *get_expired_event(void)
{
event_t *event;
cp();
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if(event_tree->head)
{
event = (event_t *)event_tree->head->data;
if(event->time < now)
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{
avl_delete(event_tree, event);
return event;
}
}
cp();
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return NULL;
}