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- /*
- event.c -- event queue
- Copyright (C) 2002-2009 Guus Sliepen <guus@tinc-vpn.org>,
- 2002-2005 Ivo Timmermans
- 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.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
- #include "system.h"
- #include "avl_tree.h"
- #include "event.h"
- #include "utils.h"
- #include "xalloc.h"
- avl_tree_t *event_tree;
- extern time_t now;
- static int id;
- static int event_compare(const event_t *a, const 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) {
- event_tree = avl_alloc_tree((avl_compare_t) event_compare, (avl_action_t) free_event);
- }
- void exit_events(void) {
- avl_delete_tree(event_tree);
- }
- void expire_events(void) {
- avl_node_t *node;
- event_t *event;
- time_t diff;
- /*
- * Make all events appear expired by subtracting the difference between
- * the expiration time of the last event and the current time.
- */
- if(!event_tree->tail) {
- return;
- }
- event = event_tree->tail->data;
- if(event->time <= now) {
- return;
- }
- diff = event->time - now;
- for(node = event_tree->head; node; node = node->next) {
- event = node->data;
- event->time -= diff;
- }
- }
- event_t *new_event(void) {
- return xmalloc_and_zero(sizeof(event_t));
- }
- void free_event(event_t *event) {
- free(event);
- }
- void event_add(event_t *event) {
- event->id = ++id;
- avl_insert(event_tree, event);
- }
- void event_del(event_t *event) {
- avl_delete(event_tree, event);
- }
- event_t *get_expired_event(void) {
- event_t *event;
- if(event_tree->head) {
- event = event_tree->head->data;
- if(event->time <= now) {
- avl_node_t *node = event_tree->head;
- avl_unlink_node(event_tree, node);
- free(node);
- return event;
- }
- }
- return NULL;
- }
- event_t *peek_next_event(void) {
- if(event_tree->head) {
- return event_tree->head->data;
- }
- return NULL;
- }
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