From ab0a11f177091855d9c6488ab999daeadc6e9b9c Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Fri, 20 Jan 2023 11:21:56 +0100
Subject: [pvsmgr] Fix app-exit in --manager-only mode on Qt5.15

In newer Qt versions, calling QApplication::exit() in the
App constructor deadlocks the application. Set a flag
instead and exit from main()
---
 src/server/main.cpp                |  3 ++-
 src/server/serverapp/serverapp.cpp | 11 ++++++-----
 src/server/serverapp/serverapp.h   |  5 +++--
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/src/server/main.cpp b/src/server/main.cpp
index d975f80..7ae0466 100644
--- a/src/server/main.cpp
+++ b/src/server/main.cpp
@@ -1,4 +1,3 @@
-#include "mainwindow/mainwindow.h"
 #include "serverapp/serverapp.h"
 
 #include <QDebug>
@@ -21,6 +20,8 @@ void usage()
 int main(int argc, char** argv)
 {
 	ServerApp app(argc, argv);
+	if (app.shouldExit())
+		return 0;
 
 	for (QString a : app.arguments()) {
 		if (a == "--usage" || a == "--help") {
diff --git a/src/server/serverapp/serverapp.cpp b/src/server/serverapp/serverapp.cpp
index 933517b..900d3a4 100644
--- a/src/server/serverapp/serverapp.cpp
+++ b/src/server/serverapp/serverapp.cpp
@@ -1,11 +1,12 @@
+#include "../mainwindow/mainwindow.h"
+#include "serverapp.h"
+#include "../../shared/util.h"
+
 #include <QTranslator>
 #include <QNetworkInterface>
 #include <QSettings>
 #include <QLibraryInfo>
 
-#include "serverapp.h"
-#include "../../shared/util.h"
-
 static QSize minimalGridSize(const QMap<QString, QPoint>& clientPositions, QSize& clientSize);
 
 ServerApp::ServerApp(int& argc, char** argv)
@@ -21,8 +22,8 @@ ServerApp::ServerApp(int& argc, char** argv)
 
 	// If started in manager-only mode, and there is no current room
 	// after reading the config, exit right away
-	if (_managerOnly && _currentRoom == "") {
-		QApplication::exit(0);
+	if (_managerOnly && _currentRoom.isEmpty()) {
+		_doExit = true;
 		return;
 	}
 
diff --git a/src/server/serverapp/serverapp.h b/src/server/serverapp/serverapp.h
index b2b16c5..3cb40b5 100644
--- a/src/server/serverapp/serverapp.h
+++ b/src/server/serverapp/serverapp.h
@@ -1,8 +1,6 @@
 #ifndef SERVERAPP_H
 #define SERVERAPP_H
 
-#include "../mainwindow/mainwindow.h"
-
 #include <QApplication>
 #include <QStringList>
 #include <QMap>
@@ -49,6 +47,7 @@ private:
 	QByteArray _sessionNameArray;
 	QMap<QString, Room*> _rooms;
 	QString _currentRoom;
+	bool _doExit{};
 
 	bool _managerOnly{};
 	bool _isExam{};
@@ -78,6 +77,8 @@ public:
 	void setCurrentRoom(const QString& room) { _currentRoom = room; }
 	void setExam(bool exam) { _isExam = exam; }
 
+	bool shouldExit() const { return _doExit; }
+
 };
 
 #endif
-- 
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