1 files changed, 64 insertions, 0 deletions
diff --git a/proto-ft/mutex.cpp b/proto-ft/mutex.cpp
new file mode 100755
index 00000000..0d50c9bd
--- /dev/null
+++ b/proto-ft/mutex.cpp
@@ -0,0 +1,64 @@
+#include "ftnoir_protocol_ft.h"
+#include <windows.h>
+
+class check_for_first_run : public runonce
+{
+    bool checked_for_first_run;
+    bool is_first_instance;
+
+public:
+    bool is_first_run() override
+    {
+        return checked_for_first_run && is_first_instance;
+    }
+
+    void try_runonce() override
+    {
+        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);
+
+        qDebug() << "ft runonce:" << "first-run" << is_first_instance << "checked" << checked_for_first_run;
+    }
+
+    void try_exit() override
+    {
+        if (is_first_instance)
+        {
+            qDebug() << "ft runonce: removing registry keys";
+            FTNoIR_Protocol::set_protocols(false, false);
+        }
+    }
+
+public:
+    check_for_first_run() : checked_for_first_run(false), is_first_instance(false)
+    {
+    }
+    ~check_for_first_run()
+    {
+        try_exit();
+    }
+};
+
+std::unique_ptr<runonce> FTNoIR_Protocol::runonce_check = std::unique_ptr<runonce>(static_cast<runonce*>(new check_for_first_run()));