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We will eventually remove the delivery of the number of occurred signals to the recipient. There haven't been any convincing use cases for this feature. In the contrary, it actually led to wrong design choices in the past where the rate of signals carried information (such as the progress of time) that should better be obtained via an explicit RPC call. The old 'Signal_rpc_member' template retains the old interface for now. But the new 'Signal_handler' omits the 'unsigned' argument from the handler function.
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.