event: Ensure the event loop has been cleaned up in event_teardown

- Add input_teardown/signal_teardown to take care of closing signal/stdin
  handles.
- Call those functions in event_teardown, and ensure there are no active handles
  by entering an infinite loop when there are unclosed handles(think of this as
  an assertion that can't go unoticed on travis).
- Move event_teardown call to the end of mch_exit. That is required because
  event_poll may still be called in that function.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/nvim/os/event.c b/src/nvim/os/event.c
index e09303e505..ecaec0b9ce 100644
--- a/src/nvim/os/event.c
+++ b/src/nvim/os/event.c
@@ -71,7 +71,15 @@ void event_teardown(void)
   channel_teardown();
   job_teardown();
   server_teardown();
+  signal_teardown();
   input_stop();
+  input_teardown();
+  do {
+    // This will loop forever if we leave any unclosed handles. Currently it is
+    // the most reliable way to use travis for verifying the no libuv-related
+    // bugs(which can be hard to track later) were introduced on a PR.
+    uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+  } while (uv_loop_close(uv_default_loop()));
 }
 
 // Wait for some event