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"
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);
51 void io_add(event_loop_t *loop, io_t *io, io_cb_t cb, void *data, int fd, int flags) {
60 io_set(loop, io, flags);
62 if(!splay_insert_node(&loop->ios, &io->node))
66 void io_set(event_loop_t *loop, io_t *io, int flags) {
70 FD_SET(io->fd, &loop->readfds);
72 FD_CLR(io->fd, &loop->readfds);
75 FD_SET(io->fd, &loop->writefds);
77 FD_CLR(io->fd, &loop->writefds);
80 void io_del(event_loop_t *loop, io_t *io) {
86 splay_unlink_node(&loop->ios, &io->node);
90 void timeout_add(event_loop_t *loop, timeout_t *timeout, timeout_cb_t cb, void *data, struct timeval *tv) {
93 timeout->node.data = timeout;
95 timeout_set(loop, timeout, tv);
98 void timeout_set(event_loop_t *loop, timeout_t *timeout, struct timeval *tv) {
99 if(timerisset(&timeout->tv))
100 splay_unlink_node(&loop->timeouts, &timeout->node);
102 if(!loop->now.tv_sec)
103 gettimeofday(&loop->now, NULL);
105 timeradd(&loop->now, tv, &timeout->tv);
107 if(!splay_insert_node(&loop->timeouts, &timeout->node))
111 void timeout_del(event_loop_t *loop, timeout_t *timeout) {
115 splay_unlink_node(&loop->timeouts, &timeout->node);
117 timeout->tv = (struct timeval){0, 0};
120 static int signal_compare(const signal_t *a, const signal_t *b) {
121 return (int)a->signum - (int)b->signum;
124 static void signalio_handler(event_loop_t *loop, void *data, int flags) {
125 unsigned char signum;
126 if(read(loop->pipefd[0], &signum, 1) != 1)
129 signal_t *sig = splay_search(&loop->signals, &((signal_t){.signum = signum}));
131 sig->cb(loop, sig->data);
134 static void pipe_init(event_loop_t *loop) {
135 if(!pipe(loop->pipefd))
136 io_add(loop, &loop->signalio, signalio_handler, NULL, loop->pipefd[0], IO_READ);
139 void signal_add(event_loop_t *loop, signal_t *sig, signal_cb_t cb, void *data, uint8_t signum) {
145 sig->signum = signum;
146 sig->node.data = sig;
148 if(loop->pipefd[0] == -1)
151 if(!splay_insert_node(&loop->signals, &sig->node))
155 void signal_del(event_loop_t *loop, signal_t *sig) {
159 splay_unlink_node(&loop->signals, &sig->node);
163 bool event_loop_run(event_loop_t *loop) {
164 loop->running = true;
169 while(loop->running) {
170 gettimeofday(&loop->now, NULL);
171 struct timeval diff, *tv = NULL;
173 while(loop->timeouts.head) {
174 timeout_t *timeout = loop->timeouts.head->data;
175 timersub(&timeout->tv, &loop->now, &diff);
177 if(diff.tv_sec < 0) {
178 timeout->cb(loop, timeout->data);
179 if(timercmp(&timeout->tv, &loop->now, <))
180 timeout_del(loop, timeout);
187 memcpy(&readable, &loop->readfds, sizeof readable);
188 memcpy(&writable, &loop->writefds, sizeof writable);
193 io_t *last = loop->ios.tail->data;
197 int n = select(fds, &readable, &writable, NULL, tv);
200 if(sockwouldblock(errno))
209 for splay_each(io_t, io, &loop->ios) {
210 if(FD_ISSET(io->fd, &writable))
211 io->cb(loop, io->data, IO_WRITE);
212 else if(FD_ISSET(io->fd, &readable))
213 io->cb(loop, io->data, IO_READ);
220 void event_flush_output(event_loop_t *loop) {
221 for splay_each(io_t, io, &loop->ios)
222 if(FD_ISSET(io->fd, &loop->writefds))
223 io->cb(loop, io->data, IO_WRITE);
226 void event_loop_stop(event_loop_t *loop) {
227 loop->running = false;
230 void event_loop_init(event_loop_t *loop) {
231 loop->ios.compare = (splay_compare_t)io_compare;
232 loop->timeouts.compare = (splay_compare_t)timeout_compare;
233 loop->signals.compare = (splay_compare_t)signal_compare;
234 loop->pipefd[0] = -1;
235 loop->pipefd[1] = -1;
236 gettimeofday(&loop->now, NULL);
239 void event_loop_exit(event_loop_t *loop) {
240 for splay_each(io_t, io, &loop->ios)
241 splay_free_node(&loop->ios, node);
242 for splay_each(timeout_t, timeout, &loop->timeouts)
243 splay_free_node(&loop->timeouts, node);
244 for splay_each(signal_t, signal, &loop->signals)
245 splay_free_node(&loop->signals, node);