/*
    event.c -- event queue
    Copyright (C) 2002 Guus Sliepen <guus@sliepen.warande.net>,
                  2002 Ivo Timmermans <itimmermans@bigfoot.com>

    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 1.1.4.2 2002/03/01 14:09:30 guus Exp $
*/

#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;

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
  event_tree = avl_alloc_tree((avl_compare_t)event_compare, NULL);
cp
}

void exit_events(void)
{
cp
  avl_delete_tree(event_tree);
cp
}

event_t *new_event(void)
{
  event_t *event;
cp
  event = (event_t *)xmalloc_and_zero(sizeof(*event));
cp
  return event;
}

void free_event(event_t *event)
{
cp
  free(event);
cp
}

void event_add(event_t *event)
{
cp
  event->id = ++id;
  avl_insert(event_tree, event);
cp
}

void event_del(event_t *event)
{
cp
  avl_delete(event_tree, event);
cp
}

event_t *get_expired_event(void)
{
  event_t *event;
cp
  if(event_tree->head)
  {
    event = (event_t *)event_tree->head->data;
    if(event->time < now)
    {
      avl_delete(event_tree, event);
      return event;
    }
  }
cp  
  return NULL;
}