From a1cb1e1395c2e94d6b427213915c6d6ae5709d20 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Mon, 23 Mar 2026 22:27:08 +0200
Subject: Fix global variable in repl.go with mutex protection

---
 internal/repl/repl.go | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'internal')

diff --git a/internal/repl/repl.go b/internal/repl/repl.go
index 0234e49..1b6e249 100644
--- a/internal/repl/repl.go
+++ b/internal/repl/repl.go
@@ -7,6 +7,7 @@ import (
 	"os/signal"
 	"path/filepath"
 	"strings"
+	"sync"
 	"syscall"
 
 	"codeberg.org/snonux/perc/internal/calculator"
@@ -25,9 +26,12 @@ type RPNState struct {
 }
 
 // getRPNState returns or creates the RPN state
+var rpnStateMu sync.RWMutex
 var rpnState *RPNState
 
 func getRPNState() *RPNState {
+	rpnStateMu.Lock()
+	defer rpnStateMu.Unlock()
 	if rpnState == nil {
 		vars := rpn.NewVariables()
 		rpnState = &RPNState{
-- 
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