Teigha Kernel provides a simple and powerful high-level cross-platform API called Thread Pool Services which is used for invoking multithreading functionality inside Teigha-based applications and libraries. Thread Pool Services is provided by Teigha Kernel as a separate extension module that can be loaded on demand.
Interactivity mode is a new feature of the Teigha graphics system . It allows for automatic interruption of the drawing process if the process is taking a long time. Of course in this case the drawing will not be drawn completely, but this feature can be useful for multiple consecutive redraws when the result of the intermediate redraw is not so important.