2 event.c -- I/O, timeout and signal event handling
3 Copyright (C) 2014 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"
31 static int io_compare(const io_t *a, const io_t *b) {
35 static int timeout_compare(const timeout_t *a, const timeout_t *b) {
37 timersub(&a->tv, &b->tv, &diff);
53 void io_add(event_loop_t *loop, io_t *io, io_cb_t cb, void *data, int fd, int flags) {
62 io_set(loop, io, flags);
64 if(!splay_insert_node(&loop->ios, &io->node))
68 void io_set(event_loop_t *loop, io_t *io, int flags) {
72 FD_SET(io->fd, &loop->readfds);
74 FD_CLR(io->fd, &loop->readfds);
77 FD_SET(io->fd, &loop->writefds);
79 FD_CLR(io->fd, &loop->writefds);
82 void io_del(event_loop_t *loop, io_t *io) {
88 splay_unlink_node(&loop->ios, &io->node);
92 void timeout_add(event_loop_t *loop, timeout_t *timeout, timeout_cb_t cb, void *data, struct timeval *tv) {
95 timeout->node.data = timeout;
97 timeout_set(loop, timeout, tv);
100 void timeout_set(event_loop_t *loop, timeout_t *timeout, struct timeval *tv) {
101 if(timerisset(&timeout->tv))
102 splay_unlink_node(&loop->timeouts, &timeout->node);
104 if(!loop->now.tv_sec)
105 gettimeofday(&loop->now, NULL);
107 timeradd(&loop->now, tv, &timeout->tv);
109 if(!splay_insert_node(&loop->timeouts, &timeout->node))
113 void timeout_del(event_loop_t *loop, timeout_t *timeout) {
117 splay_unlink_node(&loop->timeouts, &timeout->node);
119 timeout->tv = (struct timeval){0, 0};
122 static int signal_compare(const signal_t *a, const signal_t *b) {
123 return (int)a->signum - (int)b->signum;
126 static void signalio_handler(event_loop_t *loop, void *data, int flags) {
127 unsigned char signum;
128 if(read(loop->pipefd[0], &signum, 1) != 1)
131 signal_t *sig = splay_search(&loop->signals, &((signal_t){.signum = signum}));
133 sig->cb(loop, sig->data);
136 static void pipe_init(event_loop_t *loop) {
137 if(!pipe(loop->pipefd))
138 io_add(loop, &loop->signalio, signalio_handler, NULL, loop->pipefd[0], IO_READ);
141 void signal_add(event_loop_t *loop, signal_t *sig, signal_cb_t cb, void *data, uint8_t signum) {
147 sig->signum = signum;
148 sig->node.data = sig;
150 if(loop->pipefd[0] == -1)
153 if(!splay_insert_node(&loop->signals, &sig->node))
157 void signal_del(event_loop_t *loop, signal_t *sig) {
161 splay_unlink_node(&loop->signals, &sig->node);
165 bool event_loop_run(event_loop_t *loop) {
166 loop->running = true;
171 while(loop->running) {
172 gettimeofday(&loop->now, NULL);
173 struct timeval diff, *tv = NULL;
175 while(loop->timeouts.head) {
176 timeout_t *timeout = loop->timeouts.head->data;
177 timersub(&timeout->tv, &loop->now, &diff);
179 if(diff.tv_sec < 0) {
180 timeout->cb(loop, timeout->data);
181 if(timercmp(&timeout->tv, &loop->now, <))
182 timeout_del(loop, timeout);
189 memcpy(&readable, &loop->readfds, sizeof readable);
190 memcpy(&writable, &loop->writefds, sizeof writable);
195 io_t *last = loop->ios.tail->data;
199 int n = select(fds, &readable, &writable, NULL, tv);
202 if(sockwouldblock(errno))
211 for splay_each(io_t, io, &loop->ios) {
212 if(FD_ISSET(io->fd, &writable))
213 io->cb(loop, io->data, IO_WRITE);
214 else if(FD_ISSET(io->fd, &readable))
215 io->cb(loop, io->data, IO_READ);
222 void event_flush_output(event_loop_t *loop) {
223 for splay_each(io_t, io, &loop->ios)
224 if(FD_ISSET(io->fd, &loop->writefds))
225 io->cb(loop, io->data, IO_WRITE);
228 void event_loop_stop(event_loop_t *loop) {
229 loop->running = false;
232 void event_loop_init(event_loop_t *loop) {
233 loop->ios.compare = (splay_compare_t)io_compare;
234 loop->timeouts.compare = (splay_compare_t)timeout_compare;
235 loop->signals.compare = (splay_compare_t)signal_compare;
236 loop->pipefd[0] = -1;
237 loop->pipefd[1] = -1;
238 gettimeofday(&loop->now, NULL);
241 void event_loop_exit(event_loop_t *loop) {
242 for splay_each(io_t, io, &loop->ios)
243 splay_free_node(&loop->ios, node);
244 for splay_each(timeout_t, timeout, &loop->timeouts)
245 splay_free_node(&loop->timeouts, node);
246 for splay_each(signal_t, signal, &loop->signals)
247 splay_free_node(&loop->signals, node);