OpenBinder is a system for inter-process communication. It was developed at Be Inc. and then Palm, Inc. and was the basis for the Binder framework now used in the Android operating system developed by Google.
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 is achieved using ioctls on a given file descriptor, communicating with a kernel driver.
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