Fix event loop io tree inconsistency on Windows.

On Windows, the event loop io tree uses the Windows Event handle to
differentiate between io_t objects. Unfortunately, there is a bug in
the io_add_event() function (introduced in
2f9a1d4ab5ff51b05a5e8cc41a1528fdeb36c723) as it sets the event after
inserting the object into the tree, resulting in objects appearing in
io_tree out of order.

This can lead to crashes on Windows as the event loop is unable to
determine which events fired.

diff --git a/src/event.c b/src/event.c
index cb710a0..60d357d 100644 (file)
--- a/src/event.c
+++ b/src/event.c
@@ -91,8 +91,8 @@ void io_add(io_t *io, io_cb_t cb, void *data, int fd, int flags) {
 
 #ifdef HAVE_MINGW
 void io_add_event(io_t *io, io_cb_t cb, void *data, WSAEVENT event) {
-       io_add(io, cb, data, -1, 0);
        io->event = event;
+       io_add(io, cb, data, -1, 0);
 }
 #endif