2 event.c -- I/O, timeout and signal event handling
3 Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
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.
25 #include "splay_tree.h"
29 static int io_compare(const io_t *a, const io_t *b) {
33 static int timeout_compare(const timeout_t *a, const timeout_t *b) {
35 timersub(&a->tv, &b->tv, &diff);
45 if(diff.tv_usec < 0) {
49 if(diff.tv_usec > 0) {
64 void io_add(event_loop_t *loop, io_t *io, io_cb_t cb, void *data, int fd, int flags) {
74 io_set(loop, io, flags);
76 if(!splay_insert_node(&loop->ios, &io->node)) {
81 void io_set(event_loop_t *loop, io_t *io, int flags) {
85 FD_SET(io->fd, &loop->readfds);
87 FD_CLR(io->fd, &loop->readfds);
90 if(flags & IO_WRITE) {
91 FD_SET(io->fd, &loop->writefds);
93 FD_CLR(io->fd, &loop->writefds);
97 void io_del(event_loop_t *loop, io_t *io) {
102 loop->deletion = true;
106 splay_unlink_node(&loop->ios, &io->node);
110 void timeout_add(event_loop_t *loop, timeout_t *timeout, timeout_cb_t cb, void *data, struct timeval *tv) {
112 timeout->tv = (struct timeval) {
118 timeout->data = data;
120 timeout->node.data = timeout;
122 timeout_set(loop, timeout, tv);
125 void timeout_set(event_loop_t *loop, timeout_t *timeout, struct timeval *tv) {
126 if(timerisset(&timeout->tv)) {
127 splay_unlink_node(&loop->timeouts, &timeout->node);
130 if(!loop->now.tv_sec) {
131 gettimeofday(&loop->now, NULL);
134 timeradd(&loop->now, tv, &timeout->tv);
136 if(!splay_insert_node(&loop->timeouts, &timeout->node)) {
141 void timeout_del(event_loop_t *loop, timeout_t *timeout) {
146 loop->deletion = true;
148 splay_unlink_node(&loop->timeouts, &timeout->node);
150 timeout->tv = (struct timeval) {
155 static int signal_compare(const signal_t *a, const signal_t *b) {
156 return (int)a->signum - (int)b->signum;
159 static void signalio_handler(event_loop_t *loop, void *data, int flags) {
162 unsigned char signum;
164 if(read(loop->pipefd[0], &signum, 1) != 1) {
168 signal_t *sig = splay_search(&loop->signals, &((signal_t) {
173 sig->cb(loop, sig->data);
177 static void pipe_init(event_loop_t *loop) {
178 if(!pipe(loop->pipefd)) {
179 io_add(loop, &loop->signalio, signalio_handler, NULL, loop->pipefd[0], IO_READ);
183 void signal_trigger(event_loop_t *loop, signal_t *sig) {
184 uint8_t signum = sig->signum;
185 write(loop->pipefd[1], &signum, 1);
189 void signal_add(event_loop_t *loop, signal_t *sig, signal_cb_t cb, void *data, uint8_t signum) {
196 sig->signum = signum;
197 sig->node.data = sig;
199 if(loop->pipefd[0] == -1) {
203 if(!splay_insert_node(&loop->signals, &sig->node)) {
208 void signal_del(event_loop_t *loop, signal_t *sig) {
213 loop->deletion = true;
215 splay_unlink_node(&loop->signals, &sig->node);
219 void idle_set(event_loop_t *loop, idle_cb_t cb, void *data) {
221 loop->idle_data = data;
224 bool event_loop_run(event_loop_t *loop, pthread_mutex_t *mutex) {
228 while(loop->running) {
229 gettimeofday(&loop->now, NULL);
230 struct timeval diff, it, *tv = NULL;
232 while(loop->timeouts.head) {
233 timeout_t *timeout = loop->timeouts.head->data;
234 timersub(&timeout->tv, &loop->now, &diff);
236 if(diff.tv_sec < 0) {
237 timeout->cb(loop, timeout->data);
239 if(timercmp(&timeout->tv, &loop->now, <)) {
240 timeout_del(loop, timeout);
249 it = loop->idle_cb(loop, loop->idle_data);
251 if(it.tv_sec >= 0 && (!tv || timercmp(&it, tv, <))) {
256 memcpy(&readable, &loop->readfds, sizeof(readable));
257 memcpy(&writable, &loop->writefds, sizeof(writable));
262 io_t *last = loop->ios.tail->data;
266 // release mesh mutex during select
268 pthread_mutex_unlock(mutex);
271 int n = select(fds, &readable, &writable, NULL, tv);
274 pthread_mutex_lock(mutex);
278 if(sockwouldblock(errno)) {
289 // Normally, splay_each allows the current node to be deleted. However,
290 // it can be that one io callback triggers the deletion of another io,
291 // so we have to detect this and break the loop.
293 loop->deletion = false;
295 for splay_each(io_t, io, &loop->ios) {
296 if(FD_ISSET(io->fd, &writable) && io->cb) {
297 io->cb(loop, io->data, IO_WRITE);
304 if(FD_ISSET(io->fd, &readable) && io->cb) {
305 io->cb(loop, io->data, IO_READ);
317 void event_flush_output(event_loop_t *loop) {
318 for splay_each(io_t, io, &loop->ios)
319 if(FD_ISSET(io->fd, &loop->writefds)) {
320 io->cb(loop, io->data, IO_WRITE);
324 void event_loop_start(event_loop_t *loop) {
325 loop->running = true;
328 void event_loop_stop(event_loop_t *loop) {
329 loop->running = false;
332 void event_loop_init(event_loop_t *loop) {
333 loop->ios.compare = (splay_compare_t)io_compare;
334 loop->timeouts.compare = (splay_compare_t)timeout_compare;
335 loop->signals.compare = (splay_compare_t)signal_compare;
336 loop->pipefd[0] = -1;
337 loop->pipefd[1] = -1;
338 gettimeofday(&loop->now, NULL);
341 void event_loop_exit(event_loop_t *loop) {
342 for splay_each(io_t, io, &loop->ios) {
343 splay_unlink_node(&loop->ios, node);
346 for splay_each(timeout_t, timeout, &loop->timeouts) {
347 splay_unlink_node(&loop->timeouts, node);
350 for splay_each(signal_t, signal, &loop->signals) {
351 splay_unlink_node(&loop->signals, node);