The components developed and integrated in the OCERA RTLinux-GPL improve the compatibility of original RTLinux-GPL with the Real-Time POSIX.13 subset standard. OCERA contributions go beyond current POSIX standard and implement some POSIX draft proposals, which makes OCERA RTLinux-GPL one of the most technologically advanced RTOS.

This profile includes a minimal Linux needed to boot the system. The typical size of both environments can be around 1,4 Mb and needs 4Mb of memory.

RTLinux-GPL has been enriched with a set of components oriented to add POSIX compatibility (POSIX Signals, POSIX Timers, POSIX Barriers, POSIX Message Queue, POSIX Trace, POSIX High Resolution Timers, POSIX Execution Timers) and a minimal version of the tracing facilities (Lightweight POSIX Trace).

From the scheduling point of view, several policies are possible: Static priorities (RMS), Dynamic priorities (EDF), Constant bandwith server (IRIS) and Resource Protocol (SRP) to avoid priority inversion.

Additionally, the user can define its own scheduling policy (Application Defined Scheduling) to schedule the application tasks.

The main kernel characteristics are:

From the communications point of view, the developed protocols are:

LightWeigth TCP/IP
CAN and OpenCAN
Real-Time Ethernet