Added cpp style mechanisme to queue callables on window thread.

mainwindow.h

@@ -22,15 +22,36 @@ namespace Pgsql {
 
 }
 
+#include <deque>
+#include <mutex>
+
+class TaskQueue {
+public:
+
+private:
+};
+
 class MainWindow : public QMainWindow
 {
 	Q_OBJECT
 
 public:
+	using callable = std::function<void()>;
+
 	explicit MainWindow(QWidget *parent = 0);
 	~MainWindow();
 
+	/* Meant to be called from other threads to pass a code block
+	 * that has to be executed in the context of the thread of the window.
+	 */
+	void QueueTask(callable c);
+
 private:
+	using t_CallableQueue = std::deque<callable>;
+	std::mutex m_mutexCallableQueue;
+	t_CallableQueue m_callableQueue;
+
+
 	std::unique_ptr<Ui::MainWindow> ui;
 	std::unique_ptr<SqlHighlighter> highlighter;
 
@@ -65,7 +86,7 @@ private slots:
 	void cancel_query();
 	void receiveNotice(Pgsql::ErrorDetails notice);
 
-
+	void processCallableQueue();
 };
 
 #endif // MAINWINDOW_H