Abstract: A software program for use on an embedded computing device includes an operating system layer, an application framework, and a programming environment. the programming environment includes a contention locking scheme for setting light object locks, which are handled in user space, and heavy object locks, which are handled at the system level. The contention locking scheme is configured to set a light object lock on an initially unlocked object when a first thread attempts to lock the object, and to maintain a light lock on the object when a nested intra-thread lock is attempted by the first thread.

Abstract: A client software program for use on an embedded computing device includes an operating system layer including an abstraction layer, a programming environment, and an application framework including a package manager. The client is configured to interface with a client support server including a package repository, for receiving package data for running a software package on the embedded computing device.

Abstract: A graphics rendering software program for use on an embedded computing device includes an application layer, a graphics toolkit, and a graphics driver for rendering a plurality of drawing surfaces, including a first drawing surface and a second drawing surface, on a display of the embedded computing device. The graphics driver is configured to render the first drawing surface at least partially overlapping the second drawing surface on the display. When the first drawing surface is rendered as partially overlapping the second drawing surface, a visible portion of the second drawing surface is computed as a set of rectangular clip segments.

Abstract: A client software program for use with an embedded device includes an application layer, a programming environment configured to render user interface component areas and query user interface component extensions from a shared delegation object, and an operating system layer. A drawing is preferably split up into a non-overridable system part and an overridable user part. The user interface component data and data used to factorize the way it is rendered are logically separated.