
Time & Space Partitioned DO-178 Level A Certifiable RTOS
Deos™ (DDC-I Embedded Operating System) is a proven, full featured DO-178B Level A certifiable real-time operating system (RTOS) which addresses the issues of high robustness and formal certifiability for avionics and safety critical applications. Deos is the only DO-178B, Level A, certifiable time & space partitioned RTOS built from the ground up with these goals in mind, and represents hundreds of person-years of engineering investment. Deos offers several unique fundamental and patented architectural advantages over all other competing RTOS's. The result is that Deos offers the best performance, lowest risk, easiest to certify, and lowest cost time & space partitioned COTS RTOS for airborne avionics and safety critical applications on the market today.
Hello World Training Video
Deos Overview
Deos Processes and Threads

In addition to the typical RTOS services for memory management and synchronization, Deos has excellent support for hard-deadline deterministic periodic execution. Additionally, Deos provides highly efficient, deterministic inter-process/inter-processor, periodic & aperiodic communication mechanisms which enable the designer to isolate applications from changes in I/O format and bus hardware/source.
It is common for resource contention conflicts, in otherwise well tested software, to manifest during integration. These errors can be difficult to locate because interactions are complex and rarely understood by any one individual. The Deos Integration Tool makes obvious, during development and design, an application's resources needs, this prevents contention while providing early warning of physical resource depletion. An application's memory, I/O, interrupt and processing time needs are defined early in the life cycle and follow it throughout development, testing & verification; thus reducing the time and cost of integration.
The cost to re-certify previously approved software is a function of the amount of change. Changing just a single module and then re-compiling/re-linking the whole system results in an entirely new executable. Deos solves this problem by supporting run-time linkable libraries and executables (i.e., it is a DO-178B Level-A Link/Loader). Consequently a change to one module within an executable impacts only that executable. The executables for the rest of the system, and even the run-time linkable libraries used by the application remain unchanged. This isolation of change impact results in a reduced re-certification cost thereby making it easier to embrace change and incrementally improve your product offerings.
Of course, Deos comes with all the software development and debugging tools you've come to expect: IDE, Debugger, run-time system monitor/profiler, as well as integrated emulator support. Additionally, Deos provides integration and configuration tools which enable the designer to factor out what would otherwise be hard-coded constraints. This factoring ability not only speeds development, but also aids in verifying the correctness of the implementation, aided by Deos provided qualified verification tools.