From 36dbdd5d276524adae5f2edcb3c0aa26d4953cae Mon Sep 17 00:00:00 2001
From: starainrt <i@b612.me>
Date: Thu, 23 Sep 2021 10:39:17 +0800
Subject: [PATCH] add lock

---
 typed.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/typed.go b/typed.go
index 32ea688..32575eb 100644
--- a/typed.go
+++ b/typed.go
@@ -36,6 +36,7 @@ var (
 	stacks        starmap.StarStack
 	stackStarted  bool = false
 	stackStopChan chan int
+	stackMu       sync.Mutex
 	stdScreen     io.Writer = colorable.NewColorableStdout()
 )
 
@@ -145,11 +146,14 @@ func generateId() string {
 }
 
 func StartStacks() {
+	stackMu.Lock()
 	if stackStarted {
+		stackMu.Unlock()
 		return
 	}
 	go func() {
 		stackStarted = true
+		stackMu.Unlock()
 		defer func() {
 			stackStarted = false
 		}()