StateOS

Free, extremely simple and amazingly tiny real-time operating system (RTOS) designed for deeply embedded applications. Target: ARM Cortex-M family. It was inspired by the concept of a state machine.

Features

• kernel works in preemptive or cooperative mode
• kernel can operate in tick-less mode (32-bit timer required)
• signals (auto clearing, protected)
• events
• flags (one, all, accept, ignore)
• barriers
• semaphores (binary, limited, counting)
• mutexes (recursive and priority inheritance)
• fast mutexes (non-recursive and non-priority-inheritance)
• condition variables
• memory pools
• message queues
• mailbox queues
• timers (one-shot, periodic)
• cmsis-rtos api
• c++ wrapper
• all documentation is contained within the source files