X-Git-Url: http://git.meshlink.io/?p=meshlink;a=blobdiff_plain;f=src%2Fevent.c;h=90f56944fec9cc2a2251d2066630f736cccaac57;hp=6827dc048c4b6135a1fa42fbabd1bce63af22406;hb=a5a8005b2d89712e124ab7295165a3e229abdad5;hpb=6bc5d626a8726fc23365ee705761a3c666a08ad4

diff --git a/src/event.c b/src/event.c
index 6827dc04..90f56944 100644
--- a/src/event.c
+++ b/src/event.c
@@ -1,6 +1,6 @@
 /*
     event.c -- I/O, timeout and signal event handling
-    Copyright (C) 2012 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
@@ -19,15 +19,12 @@
 
 #include "system.h"
 
+#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;
@@ -36,201 +33,330 @@ static int io_compare(const io_t *a, const io_t *b) {
 static int timeout_compare(const timeout_t *a, const timeout_t *b) {
 	struct timeval diff;
 	timersub(&a->tv, &b->tv, &diff);
-	return diff.tv_sec ?: diff.tv_usec;
-}
 
-static int signal_compare(const signal_t *a, const signal_t *b) {
-	return a->signum - b->signum;
-}
+	if(diff.tv_sec < 0) {
+		return -1;
+	}
 
-static splay_tree_t io_tree = {.compare = (splay_compare_t)io_compare};
-static splay_tree_t timeout_tree = {.compare = (splay_compare_t)timeout_compare};
-static splay_tree_t signal_tree = {.compare = (splay_compare_t)signal_compare};
+	if(diff.tv_sec > 0) {
+		return 1;
+	}
 
-void io_add(io_t *io, io_cb_t cb, void *data, int fd, int flags) {
-	if(io->cb)
-		return;
+	if(diff.tv_usec < 0) {
+		return -1;
+	}
+
+	if(diff.tv_usec > 0) {
+		return 1;
+	}
+
+	if(a < b) {
+		return -1;
+	}
+
+	if(a > b) {
+		return 1;
+	}
+
+	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(io, flags);
+	io_set(loop, io, flags);
 
-	splay_insert_node(&io_tree, &io->node);
+	assert(splay_insert_node(&loop->ios, &io->node));
 }
 
-void io_set(io_t *io, int flags) {
+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, &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)
-		return;
+void io_del(event_loop_t *loop, io_t *io) {
+	assert(io->cb);
+
+	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) {
-	if(timeout->cb)
-		return;
-
+void timeout_add(event_loop_t *loop, timeout_t *timeout, timeout_cb_t cb, void *data, struct timeval *tv) {
 	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(timeout->tv.tv_sec)
-		splay_unlink_node(&timeout_tree, &timeout->node);
+void timeout_set(event_loop_t *loop, timeout_t *timeout, struct timeval *tv) {
+	assert(timeout->cb);
+
+	if(timerisset(&timeout->tv)) {
+		splay_unlink_node(&loop->timeouts, &timeout->node);
+	}
+
+	if(!loop->now.tv_sec) {
+		gettimeofday(&loop->now, NULL);
+	}
+
+	timeradd(&loop->now, tv, &timeout->tv);
 
-	if(!now.tv_sec)
-		gettimeofday(&now, NULL);
+	if(!splay_insert_node(&loop->timeouts, &timeout->node)) {
+		abort();
+	}
 
-	timeradd(&now, tv, &timeout->tv);
+	loop->deletion = true;
+}
 
-	splay_insert_node(&timeout_tree, &timeout->node);
+static void timeout_disable(event_loop_t *loop, timeout_t *timeout) {
+	splay_unlink_node(&loop->timeouts, &timeout->node);
+	timeout->tv = (struct timeval) {
+		0, 0
+	};
 }
 
-void timeout_del(timeout_t *timeout) {
-	if(!timeout->cb)
+void timeout_del(event_loop_t *loop, timeout_t *timeout) {
+	if(!timeout->cb) {
 		return;
+	}
+
+	if(timerisset(&timeout->tv)) {
+		timeout_disable(loop, timeout);
+	}
 
-	splay_unlink_node(&timeout_tree, &timeout->node);
 	timeout->cb = NULL;
+	loop->deletion = true;
 }
 
-#ifndef HAVE_MINGW
-static io_t signalio;
-static int pipefd[2] = {-1, -1};
-
-static void signal_handler(int signum) {
-	unsigned char num = signum;
-	write(pipefd[1], &num, 1);
+static int signal_compare(const signal_t *a, const signal_t *b) {
+	return (int)a->signum - (int)b->signum;
 }
 
-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) {
+	assert(pipe(loop->pipefd) == 0);
+	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)
-		return;
+static void pipe_exit(event_loop_t *loop) {
+	io_del(loop, &loop->signalio);
+
+	close(loop->pipefd[0]);
+	close(loop->pipefd[1]);
+
+	loop->pipefd[0] = -1;
+	loop->pipefd[1] = -1;
+}
+
+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) {
+	assert(!sig->cb);
 
 	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);
+	}
 
-	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)
-		return;
+void signal_del(event_loop_t *loop, signal_t *sig) {
+	assert(sig->cb);
 
-	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;
+
+	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;
 }
-#endif
 
-bool event_loop(void) {
-	running = true;
+bool event_loop_run(event_loop_t *loop, pthread_mutex_t *mutex) {
+	assert(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);
+			if(diff.tv_sec < 0) {
+				timeout_disable(loop, timeout);
+				timeout->cb(loop, timeout->data);
 			} 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 = &it;
+			}
+		}
+
+		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
+		pthread_mutex_unlock(mutex);
+
 		int n = select(fds, &readable, &writable, NULL, tv);
-#ifdef HAVE_MINGW
-		EnterCriticalSection(&mutex);
-#endif
+
+		pthread_mutex_lock(mutex);
+
+		gettimeofday(&loop->now, NULL);
 
 		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, &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);
+			}
 
-		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);
+			if(loop->deletion) {
+				break;
+			}
 		}
 	}
 
 	return true;
 }
 
-void event_exit(void) {
-	running = false;
+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;
+	gettimeofday(&loop->now, NULL);
+}
+
+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);
+	}
 }