/*
- event.c -- I/O and timeout event handling
+ event.c -- I/O, timeout and signal event handling
Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
This program is free software; you can redistribute it and/or modify
if(!io->cb)
return;
+ loop->deletion = true;
+
io_set(loop, io, 0);
splay_unlink_node(&loop->ios, &io->node);
}
void timeout_add(event_loop_t *loop, timeout_t *timeout, timeout_cb_t cb, void *data, struct timeval *tv) {
+ if(!timeout->cb)
+ timeout->tv = (struct timeval){0, 0};
+
timeout->cb = cb;
timeout->data = data;
timeout->node.data = timeout;
if(!timeout->cb)
return;
+ loop->deletion = true;
+
splay_unlink_node(&loop->timeouts, &timeout->node);
timeout->cb = 0;
timeout->tv = (struct timeval){0, 0};
}
-bool event_loop_run(event_loop_t *loop) {
+static int signal_compare(const signal_t *a, const signal_t *b) {
+ return (int)a->signum - (int)b->signum;
+}
+
+static void signalio_handler(event_loop_t *loop, void *data, int flags) {
+ unsigned char signum;
+ if(read(loop->pipefd[0], &signum, 1) != 1)
+ return;
+
+ signal_t *sig = splay_search(&loop->signals, &((signal_t){.signum = signum}));
+ if(sig)
+ sig->cb(loop, sig->data);
+}
+
+static void pipe_init(event_loop_t *loop) {
+ if(!pipe(loop->pipefd))
+ io_add(loop, &loop->signalio, signalio_handler, NULL, loop->pipefd[0], IO_READ);
+}
+
+void signal_trigger(event_loop_t *loop, signal_t *sig) {
+
+ uint8_t signum = sig->signum;
+ write(loop->pipefd[1], &signum, 1);
+ return;
+
+}
+
+void signal_add(event_loop_t *loop, signal_t *sig, signal_cb_t cb, void *data, uint8_t signum) {
+ if(sig->cb)
+ return;
+
+ sig->cb = cb;
+ sig->data = data;
+ sig->signum = signum;
+ sig->node.data = sig;
+
+ if(loop->pipefd[0] == -1)
+ pipe_init(loop);
+
+ if(!splay_insert_node(&loop->signals, &sig->node))
+ abort();
+}
+
+void signal_del(event_loop_t *loop, signal_t *sig) {
+ if(!sig->cb)
+ return;
+
+ loop->deletion = true;
+
+ splay_unlink_node(&loop->signals, &sig->node);
+ sig->cb = NULL;
+}
+
+bool event_loop_run(event_loop_t *loop, pthread_mutex_t *mutex) {
loop->running = true;
fd_set readable;
fds = last->fd + 1;
}
+ // release mesh mutex during select
+ if(mutex)
+ pthread_mutex_unlock(mutex);
int n = select(fds, &readable, &writable, NULL, tv);
+ if(mutex)
+ pthread_mutex_lock(mutex);
if(n < 0) {
if(sockwouldblock(errno))
if(!n)
continue;
+ // Normally, splay_each allows the current node to be deleted. However,
+ // it can be that one io callback triggers the deletion of another io,
+ // so we have to detect this and break the loop.
+
+ loop->deletion = false;
+
for splay_each(io_t, io, &loop->ios) {
- if(FD_ISSET(io->fd, &writable))
+ if(FD_ISSET(io->fd, &writable) && io->cb)
io->cb(loop, io->data, IO_WRITE);
- else if(FD_ISSET(io->fd, &readable))
+ if(loop->deletion)
+ break;
+ if(FD_ISSET(io->fd, &readable) && io->cb)
io->cb(loop, io->data, IO_READ);
+ if(loop->deletion)
+ break;
}
}
void event_loop_init(event_loop_t *loop) {
loop->ios.compare = (splay_compare_t)io_compare;
loop->timeouts.compare = (splay_compare_t)timeout_compare;
+ loop->signals.compare = (splay_compare_t)signal_compare;
+ loop->pipefd[0] = -1;
+ loop->pipefd[1] = -1;
gettimeofday(&loop->now, NULL);
}
void event_loop_exit(event_loop_t *loop) {
for splay_each(io_t, io, &loop->ios)
- splay_free_node(&loop->ios, node);
+ splay_unlink_node(&loop->ios, node);
for splay_each(timeout_t, timeout, &loop->timeouts)
- splay_free_node(&loop->timeouts, node);
+ splay_unlink_node(&loop->timeouts, node);
+ for splay_each(signal_t, signal, &loop->signals)
+ splay_unlink_node(&loop->signals, node);
}