The Portable Operating System Interface (POSIX) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. FreeRTOS+POSIX implements *a subset* of the [POSIX threading](https://pubs.opengroup.org/onlinepubs/7908799/xsh/threads.html) API. This subset allows application developers familiar with POSIX API to develop a FreeRTOS application using POSIX like threading premitives.
With FreeRTOS+POSIX, an existing POSIX threading compliant application can not be ported to run on the FreeRTOS kernel, because FreeRTOS+POSIX does not implement more than 80% of the POSIX API. Additionally, a library designed for use with POSIX threading compatible operating systems can not be ported to FreeRTOS kernel based applications using this wrapper.
It is recommended to use this repository as a submodule. Please refer to [Git Tools — Submodules](https://git-scm.com/book/en/v2/Git-Tools-Submodules).