2 * (C) 2008,2009 by Holger Hans Peter Freyther <zecke@selfish.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include <osmocore/timer.h>
25 static LLIST_HEAD(timer_list);
26 static struct timeval s_nearest_time;
27 static struct timeval s_select_time;
29 #define MICRO_SECONDS 1000000LL
31 #define TIME_SMALLER(left, right) \
32 (left.tv_sec*MICRO_SECONDS+left.tv_usec) <= (right.tv_sec*MICRO_SECONDS+right.tv_usec)
34 void bsc_add_timer(struct timer_list *timer)
36 struct timer_list *list_timer;
38 /* TODO: Optimize and remember the closest item... */
41 /* this might be called from within update_timers */
42 llist_for_each_entry(list_timer, &timer_list, entry)
43 if (timer == list_timer)
47 llist_add(&timer->entry, &timer_list);
50 void bsc_schedule_timer(struct timer_list *timer, int seconds, int microseconds)
52 struct timeval current_time;
54 gettimeofday(¤t_time, NULL);
55 unsigned long long currentTime = current_time.tv_sec * MICRO_SECONDS + current_time.tv_usec;
56 currentTime += seconds * MICRO_SECONDS + microseconds;
57 timer->timeout.tv_sec = currentTime / MICRO_SECONDS;
58 timer->timeout.tv_usec = currentTime % MICRO_SECONDS;
62 void bsc_del_timer(struct timer_list *timer)
67 llist_del(&timer->entry);
71 int bsc_timer_pending(struct timer_list *timer)
77 * if we have a nearest time return the delta between the current
78 * time and the time of the nearest timer.
79 * If the nearest timer timed out return NULL and then we will
80 * dispatch everything after the select
82 struct timeval *bsc_nearest_timer()
84 struct timeval current_time;
86 if (s_nearest_time.tv_sec == 0 && s_nearest_time.tv_usec == 0)
89 if (gettimeofday(¤t_time, NULL) == -1)
92 unsigned long long nearestTime = s_nearest_time.tv_sec * MICRO_SECONDS + s_nearest_time.tv_usec;
93 unsigned long long currentTime = current_time.tv_sec * MICRO_SECONDS + current_time.tv_usec;
95 if (nearestTime < currentTime) {
96 s_select_time.tv_sec = 0;
97 s_select_time.tv_usec = 0;
99 s_select_time.tv_sec = (nearestTime - currentTime) / MICRO_SECONDS;
100 s_select_time.tv_usec = (nearestTime - currentTime) % MICRO_SECONDS;
103 return &s_select_time;
107 * Find the nearest time and update s_nearest_time
109 void bsc_prepare_timers()
111 struct timer_list *timer, *nearest_timer = NULL;
112 llist_for_each_entry(timer, &timer_list, entry) {
113 if (!nearest_timer || TIME_SMALLER(timer->timeout, nearest_timer->timeout)) {
114 nearest_timer = timer;
119 s_nearest_time = nearest_timer->timeout;
121 memset(&s_nearest_time, 0, sizeof(struct timeval));
126 * fire all timers... and remove them
128 int bsc_update_timers()
130 struct timeval current_time;
131 struct timer_list *timer, *tmp;
134 gettimeofday(¤t_time, NULL);
137 * The callbacks might mess with our list and in this case
138 * even llist_for_each_entry_safe is not safe to use. To allow
139 * del_timer, add_timer, schedule_timer to be called from within
140 * the callback we jump through some loops.
142 * First we set the handled flag of each active timer to zero,
143 * then we iterate over the list and execute the callbacks. As the
144 * list might have been changed (specially the next) from within
145 * the callback we have to start over again. Once every callback
146 * is dispatched we will remove the non-active from the list.
148 * TODO: If this is a performance issue we can poison a global
149 * variable in add_timer and del_timer and only then restart.
151 llist_for_each_entry(timer, &timer_list, entry) {
156 llist_for_each_entry(timer, &timer_list, entry) {
157 if (!timer->handled && TIME_SMALLER(timer->timeout, current_time)) {
160 (*timer->cb)(timer->data);
166 llist_for_each_entry_safe(timer, tmp, &timer_list, entry) {
168 if (!timer->active) {
169 bsc_del_timer(timer);
176 int bsc_timer_check(void)
178 struct timer_list *timer;
181 llist_for_each_entry(timer, &timer_list, entry) {