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We cannot trust signal imprints received with signals to represent valid pointers to signal contexts. After a signal context has been dissolved from its receiver, a signal corresponding to the context might still be in flight. Hence, we need a facility to check received signal imprints against the list of valid contexts at reception time. The new 'Signal_context_registry' is a very simple attempt to create such a facility.
This is generic part of the Genode implementation. It consists of two parts: :_Core_: is the ultimate root of the Genode application tree and provides abstractions for the lowest-level hardware resources such as RAM, ROM, CPU, and generic device access. All generic parts of Core can be found here - for system-specific implementations refer to the appropriate 'base-<system>' directory. :_Base libraries and protocols_: that are used by each Genode component to interact with other components. This is the glue that holds everything together.