From 65672d3dfbdf179df520bbaa5e7e7ba28a27db20 Mon Sep 17 00:00:00 2001
From: Konstantinos Sideris <sideris.konstantin@gmail.com>
Date: Thu, 14 Dec 2017 21:55:00 +0200
Subject: Allow only one application instance

fixes #141
---
 include/RunGuard.h | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 include/RunGuard.h

(limited to 'include')

diff --git a/include/RunGuard.h b/include/RunGuard.h
new file mode 100644
index 00000000..f9a9641a
--- /dev/null
+++ b/include/RunGuard.h
@@ -0,0 +1,31 @@
+#pragma once
+
+//
+// Taken from
+// https://stackoverflow.com/questions/5006547/qt-best-practice-for-a-single-instance-app-protection
+//
+
+#include <QObject>
+#include <QSharedMemory>
+#include <QSystemSemaphore>
+
+class RunGuard
+{
+public:
+        RunGuard(const QString &key);
+        ~RunGuard();
+
+        bool isAnotherRunning();
+        bool tryToRun();
+        void release();
+
+private:
+        const QString key;
+        const QString memLockKey;
+        const QString sharedmemKey;
+
+        QSharedMemory sharedMem;
+        QSystemSemaphore memLock;
+
+        Q_DISABLE_COPY(RunGuard)
+};
-- 
cgit 1.5.1