The µOS++ IIIe Project

Last modified on Sat Feb 4 19:58:54 2017 UTC.   Improve this page

The µOS++ IIIe (micro oh ɛs plus plus third edition) project is the third iteration of µOS++, a POSIX-like, portable, open source, royalty-free, multi-tasking real-time operating system intended for 32/64-bits embedded applications, written in C++. The project is hosted on GitHub as micro-os-plus. It has a comprehensive User’s manual.

CMSIS++ is a proposal for a future CMSIS, written in C++, and is the core component of µOS++ IIIe, defining the system APIs. These APIs are documented in the CMSIS++ reference.

POSIX++ is another point of view of the project; with most system APIs using the POSIX semantics, but being written in C++, the µOS++ IIIe APIs can also be seen as a C++ version of POSIX, thus the name POSIX++.

Twofold identity

The µOS++ IIIe project can be considered from two points of view.

The µOS++ packages

From a modular point of view, µOS++ IIIe is a collection of packages hosted on GitHub in two locations:

  • the original code is grouped under the µOS++ IIIe / CMSIS++ GitHub collection of projects
  • projects based on third party code are grouped under the xPacks collection.
µOS++ Collection

The µOS++ RTOS

From an embedded system point of view, µOS++ IIIe provides the reference implementation for the CMSIS++ scheduler and portable synchronisation objects (like mutex, semaphore, etc).



Unless otherwise mentioned, all µOS++ IIIe / CMSIS++ components are provided free of charge under the terms of the MIT License.