/*
- event.c -- event queue
- Copyright (C) 2002-2003 Guus Sliepen <guus@sliepen.eu.org>,
- 2002-2003 Ivo Timmermans <ivo@o2w.nl>
+ event.c -- I/O, timeout and signal event handling
+ Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: event.c,v 1.1.4.11 2003/08/28 21:05:10 guus Exp $
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
-#include "avl_tree.h"
+#include "dropin.h"
#include "event.h"
+#include "net.h"
+#include "splay_tree.h"
#include "utils.h"
#include "xalloc.h"
-avl_tree_t *event_tree;
-extern time_t now;
+#ifndef EVENT_CLOCK
+#if defined(CLOCK_MONOTONIC_RAW) && defined(__x86_64__)
+#define EVENT_CLOCK CLOCK_MONOTONIC_RAW
+#else
+#define EVENT_CLOCK CLOCK_MONOTONIC
+#endif
+#endif
-int id;
+static void timespec_add(const struct timespec *a, const struct timespec *b, struct timespec *r) {
+ r->tv_sec = a->tv_sec + b->tv_sec;
+ r->tv_nsec = a->tv_nsec + b->tv_nsec;
-static int event_compare(const event_t *a, const event_t *b)
-{
- if(a->time > b->time)
- return 1;
+ if(r->tv_nsec > 1000000000) {
+ r->tv_sec++, r->tv_nsec -= 1000000000;
+ }
+}
+
+static void timespec_sub(const struct timespec *a, const struct timespec *b, struct timespec *r) {
+ r->tv_sec = a->tv_sec - b->tv_sec;
+ r->tv_nsec = a->tv_nsec - b->tv_nsec;
+
+ if(r->tv_nsec < 0) {
+ r->tv_sec--, r->tv_nsec += 1000000000;
+ }
+}
+
+static bool timespec_lt(const struct timespec *a, const struct timespec *b) {
+ if(a->tv_sec == b->tv_sec) {
+ return a->tv_nsec < b->tv_nsec;
+ } else {
+ return a->tv_sec < b->tv_sec;
+ }
+}
+
+static void timespec_clear(struct timespec *a) {
+ a->tv_sec = 0;
+}
+
+static bool timespec_isset(const struct timespec *a) {
+ return a->tv_sec;
+}
- if(a->time < b->time)
+static int io_compare(const io_t *a, const io_t *b) {
+ return a->fd - b->fd;
+}
+
+static int timeout_compare(const timeout_t *a, const timeout_t *b) {
+ if(a->tv.tv_sec < b->tv.tv_sec) {
+ return -1;
+ } else if(a->tv.tv_sec > b->tv.tv_sec) {
+ return 1;
+ } else if(a->tv.tv_nsec < b->tv.tv_nsec) {
return -1;
+ } else if(a->tv.tv_nsec > b->tv.tv_nsec) {
+ return 1;
+ } else if(a < b) {
+ return -1;
+ } else if(a > b) {
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+void io_add(event_loop_t *loop, io_t *io, io_cb_t cb, void *data, int fd, int flags) {
+ assert(!io->cb);
+
+ io->fd = fd;
+ io->cb = cb;
+ io->data = data;
+ io->node.data = io;
+
+ io_set(loop, io, flags);
+
+ splay_node_t *node = splay_insert_node(&loop->ios, &io->node);
+ assert(node);
+ (void)node;
+}
+
+void io_set(event_loop_t *loop, io_t *io, int flags) {
+ assert(io->cb);
+
+ io->flags = flags;
+
+ if(flags & IO_READ) {
+ FD_SET(io->fd, &loop->readfds);
+ } else {
+ FD_CLR(io->fd, &loop->readfds);
+ }
+
+ if(flags & IO_WRITE) {
+ FD_SET(io->fd, &loop->writefds);
+ } else {
+ FD_CLR(io->fd, &loop->writefds);
+ }
+}
+
+void io_del(event_loop_t *loop, io_t *io) {
+ assert(io->cb);
+
+ loop->deletion = true;
+
+ io_set(loop, io, 0);
+
+ splay_unlink_node(&loop->ios, &io->node);
+ io->cb = NULL;
+}
+
+void timeout_add(event_loop_t *loop, timeout_t *timeout, timeout_cb_t cb, void *data, struct timespec *tv) {
+ timeout->cb = cb;
+ timeout->data = data;
+ timeout->node.data = timeout;
+
+ timeout_set(loop, timeout, tv);
+}
+
+void timeout_set(event_loop_t *loop, timeout_t *timeout, struct timespec *tv) {
+ assert(timeout->cb);
+
+ if(timespec_isset(&timeout->tv)) {
+ splay_unlink_node(&loop->timeouts, &timeout->node);
+ }
+
+ if(!loop->now.tv_sec) {
+ clock_gettime(EVENT_CLOCK, &loop->now);
+ }
+
+ timespec_add(&loop->now, tv, &timeout->tv);
+
+ if(!splay_insert_node(&loop->timeouts, &timeout->node)) {
+ abort();
+ }
+
+ loop->deletion = true;
+}
+
+static void timeout_disable(event_loop_t *loop, timeout_t *timeout) {
+ splay_unlink_node(&loop->timeouts, &timeout->node);
+ timespec_clear(&timeout->tv);
+}
+
+void timeout_del(event_loop_t *loop, timeout_t *timeout) {
+ if(!timeout->cb) {
+ return;
+ }
+
+ if(timespec_isset(&timeout->tv)) {
+ timeout_disable(loop, timeout);
+ }
+
+ timeout->cb = NULL;
+ loop->deletion = true;
+}
- return a->id - b->id;
+static int signal_compare(const signal_t *a, const signal_t *b) {
+ return (int)a->signum - (int)b->signum;
}
-void init_events(void)
-{
- cp();
+static void signalio_handler(event_loop_t *loop, void *data, int flags) {
+ (void)data;
+ (void)flags;
+ unsigned char signum;
+
+ if(read(loop->pipefd[0], &signum, 1) != 1) {
+ return;
+ }
+
+ signal_t *sig = splay_search(&loop->signals, &(signal_t) {
+ .signum = signum
+ });
- event_tree = avl_alloc_tree((avl_compare_t) event_compare, NULL);
+ if(sig) {
+ sig->set = false;
+ sig->cb(loop, sig->data);
+ }
}
-void exit_events(void)
-{
- cp();
+static void pipe_init(event_loop_t *loop) {
+ int result = pipe(loop->pipefd);
+ assert(result == 0);
- avl_delete_tree(event_tree);
+ if(result == 0) {
+ io_add(loop, &loop->signalio, signalio_handler, NULL, loop->pipefd[0], IO_READ);
+ }
}
-event_t *new_event(void)
-{
- cp();
+static void pipe_exit(event_loop_t *loop) {
+ io_del(loop, &loop->signalio);
- return xmalloc_and_zero(sizeof(event_t));
+ close(loop->pipefd[0]);
+ close(loop->pipefd[1]);
+
+ loop->pipefd[0] = -1;
+ loop->pipefd[1] = -1;
}
-void free_event(event_t *event)
-{
- cp();
+void signal_trigger(event_loop_t *loop, signal_t *sig) {
+ if(sig->set) {
+ return;
+ }
- free(event);
+ uint8_t signum = sig->signum;
+ sig->set = true;
+ write(loop->pipefd[1], &signum, 1);
+ return;
}
-void event_add(event_t *event)
-{
- cp();
+void signal_add(event_loop_t *loop, signal_t *sig, signal_cb_t cb, void *data, uint8_t signum) {
+ assert(!sig->cb);
- event->id = ++id;
- avl_insert(event_tree, event);
+ sig->cb = cb;
+ sig->data = data;
+ sig->signum = signum;
+ sig->set = false;
+ sig->node.data = sig;
+
+ if(loop->pipefd[0] == -1) {
+ pipe_init(loop);
+ }
+
+ if(!splay_insert_node(&loop->signals, &sig->node)) {
+ abort();
+ }
}
-void event_del(event_t *event)
-{
- cp();
+void signal_del(event_loop_t *loop, signal_t *sig) {
+ assert(sig->cb);
+
+ loop->deletion = true;
- avl_delete(event_tree, event);
+ splay_unlink_node(&loop->signals, &sig->node);
+ sig->cb = NULL;
+
+ if(!loop->signals.count && loop->pipefd[0] != -1) {
+ pipe_exit(loop);
+ }
+}
+
+void idle_set(event_loop_t *loop, idle_cb_t cb, void *data) {
+ loop->idle_cb = cb;
+ loop->idle_data = data;
}
-event_t *get_expired_event(void)
-{
- event_t *event;
+bool event_loop_run(event_loop_t *loop, pthread_mutex_t *mutex) {
+ assert(mutex);
- cp();
+ fd_set readable;
+ fd_set writable;
+
+ while(loop->running) {
+ clock_gettime(EVENT_CLOCK, &loop->now);
+ struct timespec it, ts = {3600, 0};
+
+ while(loop->timeouts.head) {
+ timeout_t *timeout = loop->timeouts.head->data;
+
+ if(timespec_lt(&timeout->tv, &loop->now)) {
+ timeout_disable(loop, timeout);
+ timeout->cb(loop, timeout->data);
+ } else {
+ timespec_sub(&timeout->tv, &loop->now, &ts);
+ break;
+ }
+ }
- if(event_tree->head) {
- event = event_tree->head->data;
+ if(loop->idle_cb) {
+ it = loop->idle_cb(loop, loop->idle_data);
- if(event->time < now) {
- avl_delete(event_tree, event);
- return event;
+ if(it.tv_sec >= 0 && timespec_lt(&it, &ts)) {
+ ts = it;
+ }
+ }
+
+ memcpy(&readable, &loop->readfds, sizeof(readable));
+ memcpy(&writable, &loop->writefds, sizeof(writable));
+
+ int fds = 0;
+
+ if(loop->ios.tail) {
+ io_t *last = loop->ios.tail->data;
+ fds = last->fd + 1;
+ }
+
+ // release mesh mutex during select
+ pthread_mutex_unlock(mutex);
+
+#ifdef HAVE_PSELECT
+ int n = pselect(fds, &readable, &writable, NULL, &ts, NULL);
+#else
+ struct timeval tv = {ts.tv_sec, ts.tv_nsec / 1000};
+ int n = select(fds, &readable, &writable, NULL, (struct timeval *)&tv);
+#endif
+
+ pthread_mutex_lock(mutex);
+
+ clock_gettime(EVENT_CLOCK, &loop->now);
+
+ if(n < 0) {
+ if(sockwouldblock(errno)) {
+ continue;
+ } else {
+ return false;
+ }
+ }
+
+ 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) && io->cb) {
+ io->cb(loop, io->data, IO_WRITE);
+ }
+
+ if(loop->deletion) {
+ break;
+ }
+
+ if(FD_ISSET(io->fd, &readable) && io->cb) {
+ io->cb(loop, io->data, IO_READ);
+ }
+
+ if(loop->deletion) {
+ break;
+ }
}
}
- return NULL;
+ return true;
+}
+
+void event_flush_output(event_loop_t *loop) {
+ for splay_each(io_t, io, &loop->ios)
+ if(FD_ISSET(io->fd, &loop->writefds)) {
+ io->cb(loop, io->data, IO_WRITE);
+ }
+}
+
+void event_loop_start(event_loop_t *loop) {
+ loop->running = true;
+}
+
+void event_loop_stop(event_loop_t *loop) {
+ loop->running = false;
+}
+
+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;
+ clock_gettime(EVENT_CLOCK, &loop->now);
+}
+
+void event_loop_exit(event_loop_t *loop) {
+ assert(!loop->ios.count);
+ assert(!loop->timeouts.count);
+ assert(!loop->signals.count);
+
+ for splay_each(io_t, io, &loop->ios) {
+ splay_unlink_node(&loop->ios, node);
+ }
+
+ for splay_each(timeout_t, timeout, &loop->timeouts) {
+ splay_unlink_node(&loop->timeouts, node);
+ }
+
+ for splay_each(signal_t, signal, &loop->signals) {
+ splay_unlink_node(&loop->signals, node);
+ }
}
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