unix: unref fs event watcher

Watchers were being ref-counted twice which wasn't harmful in itself but stopped
uv_unref() from working like you'd expect it to.

Author: bnoordhuis

src/unix/kqueue.c

@@ -43,10 +43,12 @@ static void uv__fs_event_start(uv_fs_event_t* handle) {
              handle->fd,
              EV_LIBUV_KQUEUE_HACK);
   ev_io_start(handle->loop->ev, &handle->event_watcher);
+  ev_unref(handle->loop->ev);
 }
 
 
 static void uv__fs_event_stop(uv_fs_event_t* handle) {
+  ev_ref(handle->loop->ev);
   ev_io_stop(handle->loop->ev, &handle->event_watcher);
 }
 

src/unix/linux.c

@@ -283,12 +283,14 @@ int uv_fs_event_init(uv_loop_t* loop,
 
   ev_io_init(&handle->read_watcher, uv__inotify_read, fd, EV_READ);
   ev_io_start(loop->ev, &handle->read_watcher);
+  ev_unref(loop->ev);
 
   return 0;
 }
 
 
 void uv__fs_event_destroy(uv_fs_event_t* handle) {
+  ev_ref(handle->loop->ev);
   ev_io_stop(handle->loop->ev, &handle->read_watcher);
   uv__close(handle->fd);
   handle->fd = -1;

src/unix/sunos.c

@@ -166,12 +166,14 @@ int uv_fs_event_init(uv_loop_t* loop,
 
   ev_io_init(&handle->event_watcher, uv__fs_event_read, portfd, EV_READ);
   ev_io_start(loop->ev, &handle->event_watcher);
+  ev_unref(loop->ev);
 
   return 0;
 }
 
 
 void uv__fs_event_destroy(uv_fs_event_t* handle) {
+  ev_ref(handle->loop->ev);
   ev_io_stop(handle->loop->ev, &handle->event_watcher);
   uv__close(handle->fd);
   handle->fd = -1;

test/test-fs-event.c

@@ -282,7 +282,7 @@ static void timer_cb(uv_timer_t* handle, int status) {
   ASSERT(status == 0);
 
   r = uv_fs_event_init(handle->loop, &fs_event, ".", fs_event_fail, 0);
-  ASSERT(r != -1);
+  ASSERT(r == 0);
 
   uv_close((uv_handle_t*)&fs_event, close_cb);
   uv_close((uv_handle_t*)handle, close_cb);
@@ -308,3 +308,21 @@ TEST_IMPL(fs_event_immediate_close) {
 
   return 0;
 }
+
+
+TEST_IMPL(fs_event_unref) {
+  uv_loop_t* loop;
+  int r;
+
+  loop = uv_default_loop();
+
+  r = uv_fs_event_init(loop, &fs_event, ".", fs_event_fail, 0);
+  ASSERT(r == 0);
+
+  uv_unref(loop);
+
+  r = uv_run(loop);
+  ASSERT(r == 0);
+
+  return 0;
+}

test/test-list.h

@@ -112,6 +112,7 @@ TEST_DECLARE   (fs_event_watch_file)
 TEST_DECLARE   (fs_event_watch_file_current_dir)
 TEST_DECLARE   (fs_event_no_callback_on_close)
 TEST_DECLARE   (fs_event_immediate_close)
+TEST_DECLARE   (fs_event_unref)
 TEST_DECLARE   (fs_readdir_empty_dir)
 TEST_DECLARE   (fs_readdir_file)
 TEST_DECLARE   (fs_open_dir)
@@ -268,6 +269,7 @@ TASK_LIST_START
   TEST_ENTRY  (fs_event_watch_file_current_dir)
   TEST_ENTRY  (fs_event_no_callback_on_close)
   TEST_ENTRY  (fs_event_immediate_close)
+  TEST_ENTRY  (fs_event_unref)
   TEST_ENTRY  (fs_readdir_empty_dir)
   TEST_ENTRY  (fs_readdir_file)
   TEST_ENTRY  (fs_open_dir)