From 853880bd837bd394994a2a3580eb236d76093514 Mon Sep 17 00:00:00 2001
From: Konstantin Lebedev <9497591+kmlebedev@users.noreply.github.com>
Date: Fri, 2 Sep 2022 18:20:19 +0500
Subject: [PATCH] [filer] DATA RACE on signal_handling fixed (#3575)

---
 weed/util/grace/signal_handling.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/weed/util/grace/signal_handling.go b/weed/util/grace/signal_handling.go
index fc7afcad9..8146668be 100644
--- a/weed/util/grace/signal_handling.go
+++ b/weed/util/grace/signal_handling.go
@@ -12,7 +12,7 @@ import (
 
 var signalChan chan os.Signal
 var hooks = make([]func(), 0)
-var hookLock sync.Mutex
+var hookLock sync.RWMutex
 
 func init() {
 	signalChan = make(chan os.Signal, 1)
@@ -27,10 +27,12 @@ func init() {
 		// syscall.SIGQUIT,
 	)
 	go func() {
-		for _ = range signalChan {
+		for range signalChan {
+			hookLock.RLock()
 			for _, hook := range hooks {
 				hook()
 			}
+			hookLock.RUnlock()
 			os.Exit(0)
 		}
 	}()