OpenBinder
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OpenBinder is a system for interprocess communication. It was developed at Be Inc. and then Palm, Inc.[1] and has more recently been used in the Android mobile phone platform developed by Google[2].
OpenBinder allows processes to present interfaces which may be called by other threads. Each process maintains a thread pool which may be used to service such requests. OpenBinder takes care of reference counting, recursion back into the original thread, and of course the inter-process communication itself. On the Linux version of OpenBinder the communication itself is achieved using ioctls on a given filehandle, communicating with a kernel driver.