From fbe53ea845a267af639b5f7695ab4e21ef6e7065 Mon Sep 17 00:00:00 2001
From: Gerhard Hoffmann <g.hoffmann@atb-online.eu>
Date: Wed, 9 Oct 2024 12:51:38 +0200
Subject: [PATCH] Protect epi/gpi_storeHW/SWVer() by a mutex (guard)

---
 src/storeINdata.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/storeINdata.cpp b/src/storeINdata.cpp
index 50b6094..77c85e7 100755
--- a/src/storeINdata.cpp
+++ b/src/storeINdata.cpp
@@ -6,6 +6,11 @@
 #include "shared_mem_buffer.h"
 #include "datei.h"
 
+#include <QMutex>
+#include <QMutexLocker>
+
+static QMutex SWHD_mutex;
+
 // gpi: grafical access to PI: access from external devices over device controller FOR GUI
 // epi: external access from GUI to PI:  FOR external devices (DC)
 
@@ -64,6 +69,7 @@ bool indat_isMdbOn()
 
 void gpi_storeHWver(QString text)
 {
+    QMutexLocker locker(&SWHD_mutex);
     // change Qstring to array of chars, because shared mem allowes no QString!
     int  nn, LL = text.length();
     if (LL >= versionBufferLen)
@@ -79,6 +85,7 @@ void gpi_storeHWver(QString text)
 
 QString epi_loadHWver(void)
 {
+    QMutexLocker locker(&SWHD_mutex);
     // load array of chars from SM and change to QString
     int  nn, LL = versionBufferLen;
     char cc;
@@ -96,6 +103,7 @@ QString epi_loadHWver(void)
 
 void gpi_storeSWver(QString text)
 {    
+    QMutexLocker locker(&SWHD_mutex);
     int  nn, LL = text.length();
     if (LL >= versionBufferLen)
         LL=versionBufferLen-1;   // leave place for termination
@@ -111,6 +119,7 @@ void gpi_storeSWver(QString text)
 
 QString epi_loadSWver(void)
 {
+    QMutexLocker locker(&SWHD_mutex);
     int  nn, LL = versionBufferLen;
     char cc;
     QString myStr;