Add a copy of tinc 1.0's event infrastructure.

[tinc] / src / event.c

diff --git a/src/event.c b/src/event.c
new file mode 100644 (file)
index 0000000..36dab9f
--- /dev/null
+++ b/src/event.c
@@ -0,0 +1,109 @@
+/*
+    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 "splay_tree.h"
+#include "event.h"
+#include "utils.h"
+#include "xalloc.h"
+
+splay_tree_t *event_tree;
+
+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 = splay_alloc_tree((splay_compare_t) event_compare, (splay_action_t) free_event);
+}
+
+void exit_events(void) {
+       splay_delete_tree(event_tree);
+}
+
+void expire_events(void) {
+       splay_node_t *node;
+       event_t *event;
+       time_t diff;
+
+       /*
+        * Make all events appear expired by substracting the difference between
+         * the expiration time of the last event and the current time.
+        */
+
+       if(!event_tree->tail)
+               return;
+
+       event = event_tree->tail->data;
+       time_t now = time(NULL);
+
+       if(event->time < now)
+               return;
+
+       diff = 1 + 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;
+       splay_insert(event_tree, event);
+}
+
+void event_del(event_t *event) {
+       splay_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 < time(NULL)) {
+                       splay_node_t *node = event_tree->head;
+                       splay_unlink_node(event_tree, node);
+                       free(node);
+                       return event;
+               }
+       }
+
+       return NULL;
+}