/*
event.c -- I/O, timeout and signal event handling
- Copyright (C) 2012-2013 Guus Sliepen <guus@tinc-vpn.org>
+ 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
#include "dropin.h"
#include "event.h"
#include "net.h"
+#include "splay_tree.h"
#include "utils.h"
-
-struct timeval now;
-
-static fd_set readfds;
-static fd_set writefds;
-static volatile bool running;
+#include "xalloc.h"
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) {
struct timeval diff;
timersub(&a->tv, &b->tv, &diff);
- if(diff.tv_sec < 0)
+
+ if(diff.tv_sec < 0) {
return -1;
- if(diff.tv_sec > 0)
+ }
+
+ if(diff.tv_sec > 0) {
return 1;
- if(diff.tv_usec < 0)
+ }
+
+ if(diff.tv_usec < 0) {
return -1;
- if(diff.tv_usec > 0)
+ }
+
+ if(diff.tv_usec > 0) {
return 1;
- if(a < b)
+ }
+
+ if(a < b) {
return -1;
- if(a > b)
+ }
+
+ if(a > b) {
return 1;
+ }
+
return 0;
}
-static splay_tree_t io_tree = {.compare = (splay_compare_t)io_compare};
-static splay_tree_t timeout_tree = {.compare = (splay_compare_t)timeout_compare};
-
-void io_add(io_t *io, io_cb_t cb, void *data, int fd, int flags) {
- if(io->cb)
+void io_add(event_loop_t *loop, io_t *io, io_cb_t cb, void *data, int fd, int flags) {
+ if(io->cb) {
return;
+ }
io->fd = fd;
io->cb = cb;
io->data = data;
io->node.data = io;
- io_set(io, flags);
+ io_set(loop, io, flags);
- if(!splay_insert_node(&io_tree, &io->node))
+ if(!splay_insert_node(&loop->ios, &io->node)) {
abort();
+ }
}
-void io_set(io_t *io, int flags) {
+void io_set(event_loop_t *loop, io_t *io, int flags) {
io->flags = flags;
- if(flags & IO_READ)
- FD_SET(io->fd, &readfds);
- else
- FD_CLR(io->fd, &readfds);
+ 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, &writefds);
- else
- FD_CLR(io->fd, &writefds);
+ if(flags & IO_WRITE) {
+ FD_SET(io->fd, &loop->writefds);
+ } else {
+ FD_CLR(io->fd, &loop->writefds);
+ }
}
-void io_del(io_t *io) {
- if(!io->cb)
+void io_del(event_loop_t *loop, io_t *io) {
+ if(!io->cb) {
return;
+ }
+
+ loop->deletion = true;
- io_set(io, 0);
+ io_set(loop, io, 0);
- splay_unlink_node(&io_tree, &io->node);
+ splay_unlink_node(&loop->ios, &io->node);
io->cb = NULL;
}
-void timeout_add(timeout_t *timeout, timeout_cb_t cb, void *data, struct timeval *tv) {
+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;
- timeout_set(timeout, tv);
+ timeout_set(loop, timeout, tv);
}
-void timeout_set(timeout_t *timeout, struct timeval *tv) {
- if(timerisset(&timeout->tv))
- splay_unlink_node(&timeout_tree, &timeout->node);
+void timeout_set(event_loop_t *loop, timeout_t *timeout, struct timeval *tv) {
+ if(timerisset(&timeout->tv)) {
+ splay_unlink_node(&loop->timeouts, &timeout->node);
+ }
- if(!now.tv_sec)
- gettimeofday(&now, NULL);
+ if(!loop->now.tv_sec) {
+ gettimeofday(&loop->now, NULL);
+ }
- timeradd(&now, tv, &timeout->tv);
+ timeradd(&loop->now, tv, &timeout->tv);
- if(!splay_insert_node(&timeout_tree, &timeout->node))
+ if(!splay_insert_node(&loop->timeouts, &timeout->node)) {
abort();
+ }
}
-void timeout_del(timeout_t *timeout) {
- if(!timeout->cb)
+void timeout_del(event_loop_t *loop, timeout_t *timeout) {
+ if(!timeout->cb) {
return;
+ }
- splay_unlink_node(&timeout_tree, &timeout->node);
+ loop->deletion = true;
+
+ splay_unlink_node(&loop->timeouts, &timeout->node);
timeout->cb = 0;
- timeout->tv = (struct timeval){0, 0};
+ timeout->tv = (struct timeval) {
+ 0, 0
+ };
}
-#ifndef HAVE_MINGW
static int signal_compare(const signal_t *a, const signal_t *b) {
- return a->signum - b->signum;
+ return (int)a->signum - (int)b->signum;
}
-static io_t signalio;
-static int pipefd[2] = {-1, -1};
-static splay_tree_t signal_tree = {.compare = (splay_compare_t)signal_compare};
-
-static void signal_handler(int signum) {
- unsigned char num = signum;
- write(pipefd[1], &num, 1);
-}
-
-static void signalio_handler(void *data, int flags) {
+static void signalio_handler(event_loop_t *loop, void *data, int flags) {
+ (void)data;
+ (void)flags;
unsigned char signum;
- if(read(pipefd[0], &signum, 1) != 1)
+
+ if(read(loop->pipefd[0], &signum, 1) != 1) {
return;
+ }
+
+ signal_t *sig = splay_search(&loop->signals, &((signal_t) {
+ .signum = signum
+ }));
- signal_t *sig = splay_search(&signal_tree, &((signal_t){.signum = signum}));
- if(sig)
- sig->cb(sig->data);
+ if(sig) {
+ sig->cb(loop, sig->data);
+ }
}
-static void pipe_init(void) {
- if(!pipe(pipefd))
- io_add(&signalio, signalio_handler, NULL, pipefd[0], IO_READ);
+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_add(signal_t *sig, signal_cb_t cb, void *data, int signum) {
- if(sig->cb)
+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(pipefd[0] == -1)
- pipe_init();
-
- signal(sig->signum, signal_handler);
+ if(loop->pipefd[0] == -1) {
+ pipe_init(loop);
+ }
- if(!splay_insert_node(&signal_tree, &sig->node))
+ if(!splay_insert_node(&loop->signals, &sig->node)) {
abort();
+ }
}
-void signal_del(signal_t *sig) {
- if(!sig->cb)
+void signal_del(event_loop_t *loop, signal_t *sig) {
+ if(!sig->cb) {
return;
+ }
- signal(sig->signum, SIG_DFL);
+ loop->deletion = true;
- splay_unlink_node(&signal_tree, &sig->node);
+ splay_unlink_node(&loop->signals, &sig->node);
sig->cb = NULL;
}
-#endif
-bool event_loop(void) {
- running = true;
+void idle_set(event_loop_t *loop, idle_cb_t cb, void *data) {
+ loop->idle_cb = cb;
+ loop->idle_data = data;
+}
+bool event_loop_run(event_loop_t *loop, pthread_mutex_t *mutex) {
fd_set readable;
fd_set writable;
- while(running) {
- gettimeofday(&now, NULL);
- struct timeval diff, *tv = NULL;
+ while(loop->running) {
+ gettimeofday(&loop->now, NULL);
+ struct timeval diff, it, *tv = NULL;
- while(timeout_tree.head) {
- timeout_t *timeout = timeout_tree.head->data;
- timersub(&timeout->tv, &now, &diff);
+ while(loop->timeouts.head) {
+ timeout_t *timeout = loop->timeouts.head->data;
+ timersub(&timeout->tv, &loop->now, &diff);
if(diff.tv_sec < 0) {
- timeout->cb(timeout->data);
- if(timercmp(&timeout->tv, &now, <))
- timeout_del(timeout);
+ timeout->cb(loop, timeout->data);
+
+ if(timercmp(&timeout->tv, &loop->now, <)) {
+ timeout_del(loop, timeout);
+ }
} else {
tv = &diff;
break;
}
}
- memcpy(&readable, &readfds, sizeof readable);
- memcpy(&writable, &writefds, sizeof writable);
+ if(loop->idle_cb) {
+ it = loop->idle_cb(loop, loop->idle_data);
+
+ if(it.tv_sec >= 0 && (!tv || timercmp(&it, tv, <))) {
+ tv = ⁢
+ }
+ }
+
+ memcpy(&readable, &loop->readfds, sizeof(readable));
+ memcpy(&writable, &loop->writefds, sizeof(writable));
int fds = 0;
- if(io_tree.tail) {
- io_t *last = io_tree.tail->data;
+ if(loop->ios.tail) {
+ io_t *last = loop->ios.tail->data;
fds = last->fd + 1;
}
-#ifdef HAVE_MINGW
- LeaveCriticalSection(&mutex);
-#endif
+ // release mesh mutex during select
+ if(mutex) {
+ pthread_mutex_unlock(mutex);
+ }
+
int n = select(fds, &readable, &writable, NULL, tv);
-#ifdef HAVE_MINGW
- EnterCriticalSection(&mutex);
-#endif
+
+ if(mutex) {
+ pthread_mutex_lock(mutex);
+ }
if(n < 0) {
- if(sockwouldblock(errno))
+ if(sockwouldblock(errno)) {
continue;
- else
+ } else {
return false;
+ }
}
- if(!n)
+ 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, &io_tree) {
- if(FD_ISSET(io->fd, &writable))
- io->cb(io->data, IO_WRITE);
- else if(FD_ISSET(io->fd, &readable))
- io->cb(io->data, IO_READ);
+ 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 true;
}
-void event_flush_output(void) {
- for splay_each(io_t, io, &io_tree)
- if(FD_ISSET(io->fd, &writefds))
- io->cb(io->data, IO_WRITE);
+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_exit(void) {
- running = false;
+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;
+ gettimeofday(&loop->now, NULL);
+}
+
+void event_loop_exit(event_loop_t *loop) {
+ 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);
+ }
}