Why NuttX Is Best Understood as a Unix-Style RTOS
Many people first understand an RTOS as tasks, queues, semaphores, and a few driver callbacks.
NuttX does not fit that image well. It is better understood through a Unix-style model: POSIX-like APIs, VFS, device nodes, filesystems, sockets, shell, and applications form a small device system.
The first model is:
traditional MCU RTOS: application organized around tasks, queues, and driver APIs
NuttX: application organized around POSIX, VFS, device nodes, and system abstractions
That means comparing NuttX with FreeRTOS, RT-Thread, and Zephyr is not only a kernel-size comparison. It is a comparison of system abstraction.
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