From a5421de8abbbc4ec7eb6236512e11a414669f9f5 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Fri, 8 Feb 2019 20:32:00 -1000
Subject: [PATCH] mainthread: Add comments

---
 internal/mainthread/mainthread.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/internal/mainthread/mainthread.go b/internal/mainthread/mainthread.go
index 184b870b4..6491e3ee3 100644
--- a/internal/mainthread/mainthread.go
+++ b/internal/mainthread/mainthread.go
@@ -45,6 +45,8 @@ func Loop(ch <-chan error) error {
 }
 
 // Run calls f on the main thread.
+//
+// Do not call this from the main thread. This would block forever.
 func Run(f func() error) error {
 	if atomic.LoadInt32(&started) == 0 {
 		// TODO: This can reach from other goroutine before Loop is called (#809).