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Fuchsia is based on a new message passing kernel named Zircon, after the mineral zircon. Zircon's codebase was derived from that of Little Kernel (LK), a kernel for embedded devices, aimed for low resource uses, to be used on a wide variety of devices.[27] LK was developed by Travis Geiselbrecht, who had also co-authored the NewOS kernel used by Haiku.
Zircon is written mostly in C++, with some parts in assembly language. It is composed of a kernel with a small set of user services, drivers, and libraries which are all necessary for the system to boot, communicate with the hardware, and load the user processes.[28] Its present features include handling threads, virtual memory, processes intercommunication, and waiting for changes in the state of objects.[29]
It is heavily inspired by Unix kernels but differs greatly. For example, it does not support Unix-like signals but incorporates event-driven programming and the observer pattern. Most system calls do not block the main thread. Resources are represented as objects rather than files, unlike traditional Unix systems.
