From f17f57d516926622e065974fe10c7be0b53ef3b4 Mon Sep 17 00:00:00 2001
From: Etienne Dechamps <etienne@edechamps.fr>
Date: Fri, 4 Jul 2014 22:07:02 +0100
Subject: [PATCH] Uberdetailed debug information about event loop operations.

---
 src/event.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/src/event.c b/src/event.c
index f34974206..cdd7eecda 100644
--- a/src/event.c
+++ b/src/event.c
@@ -24,6 +24,7 @@
 #include "net.h"
 #include "utils.h"
 #include "xalloc.h"
+#include "logger.h"
 
 struct timeval now;
 
@@ -67,8 +68,11 @@ 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)
+	logger(DEBUG_META, LOG_NOTICE, "io_add(%x, %x, %x, %d, %d)", io, cb, data, fd, flags);
+	if(io->cb) {
+		logger(DEBUG_META, LOG_NOTICE, "io_add() ignored because of io->cb");
 		return;
+	}
 
 	io->fd = fd;
 #ifdef HAVE_MINGW
@@ -97,11 +101,16 @@ void io_add_event(io_t *io, io_cb_t cb, void *data, WSAEVENT event) {
 #endif
 
 void io_set(io_t *io, int flags) {
-	if (flags == io->flags)
+	logger(DEBUG_META, LOG_NOTICE, "io_set(%x, %d)", io, flags);
+	if (flags == io->flags) {
+		logger(DEBUG_META, LOG_NOTICE, "io_set() ignored because no-op");
 		return;
+	}
 	io->flags = flags;
-	if (io->fd == -1)
+	if (io->fd == -1) {
+		logger(DEBUG_META, LOG_NOTICE, "io_set() ignored because no fd");
 		return;
+	}
 
 #ifndef HAVE_MINGW
 	if(flags & IO_READ)
@@ -125,8 +134,11 @@ void io_set(io_t *io, int flags) {
 }
 
 void io_del(io_t *io) {
-	if(!io->cb)
+	logger(DEBUG_META, LOG_NOTICE, "io_del(%x)", io);
+	if(!io->cb) {
+		logger(DEBUG_META, LOG_NOTICE, "io_del() ignored because no io->cb");
 		return;
+	}
 
 	io_set(io, 0);
 #ifdef HAVE_MINGW
@@ -135,6 +147,8 @@ void io_del(io_t *io) {
 	event_count--;
 #endif
 
+	if (!splay_search(&io_tree, io))
+		logger(DEBUG_META, LOG_NOTICE, "io_del() called with unknown io");
 	splay_unlink_node(&io_tree, &io->node);
 	io->cb = NULL;
 }
@@ -256,6 +270,7 @@ bool event_loop(void) {
 	fd_set writable;
 
 	while(running) {
+		logger(DEBUG_META, LOG_NOTICE, "event_loop() freezing FD sets");
 		memcpy(&readable, &readfds, sizeof readable);
 		memcpy(&writable, &writefds, sizeof writable);
 		struct timeval diff;