[4] 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 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.
The kernel-side component of the Linux version of OpenBinder was merged into the Linux kernel mainline in kernel version 3.19, which was released on February 8, 2015.