From 8354713abd533c3a48282f5cdce8961df5ffa178 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Wed, 21 Feb 2018 10:25:10 +0100
Subject: [STABLE] contrib/npclient, proto/ft: revert

---
 proto-ft/mutex.cpp | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 proto-ft/mutex.cpp

(limited to 'proto-ft/mutex.cpp')

diff --git a/proto-ft/mutex.cpp b/proto-ft/mutex.cpp
new file mode 100644
index 00000000..a012ba90
--- /dev/null
+++ b/proto-ft/mutex.cpp
@@ -0,0 +1,60 @@
+#include "ftnoir_protocol_ft.h"
+#include "mutex.hpp"
+#include <windows.h>
+#include <QDebug>
+
+check_for_first_run::check_for_first_run() : checked_for_first_run(false), is_first_instance(false), enabled(false)
+{
+}
+
+bool check_for_first_run::is_first_run()
+{
+    return checked_for_first_run && is_first_instance;
+}
+
+void check_for_first_run::set_enabled(bool flag)
+{
+    enabled = flag;
+}
+
+void check_for_first_run::try_runonce()
+{
+    constexpr const char* name = "opentrack-freetrack-runonce";
+
+    if (checked_for_first_run)
+        return;
+
+    // just leak it, no issue
+    HANDLE h = CreateMutexA(nullptr, false, name);
+
+    switch (WaitForSingleObject(h, 0))
+    {
+    case WAIT_OBJECT_0:
+        is_first_instance = true;
+        checked_for_first_run = true;
+        break;
+    case WAIT_TIMEOUT:
+        checked_for_first_run = true;
+        break;
+    default:
+        checked_for_first_run = false;
+        break;
+    }
+
+    if (checked_for_first_run && !is_first_instance)
+        CloseHandle(h);
+}
+
+check_for_first_run::~check_for_first_run()
+{
+    try_exit();
+}
+
+void check_for_first_run::try_exit()
+{
+    if (is_first_instance && enabled)
+    {
+        qDebug() << "ft runonce: removing registry keys";
+        freetrack::set_protocols(false, false);
+    }
+}
-- 
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