I wonder if anyone know any simple design, but a very simple operating system written in Ada Or if possible, give an example, thank you.
Ada is a state-of-the art programming language that development teams worldwide are using for critical software: from microkernels and small-footprint, real-time embedded systems to large-scale enterprise applications, and everything in between.
Like COBOL, Ada is a mostly-dead programming language that lives on in legacy systems. The language aimed to replace the hundreds of languages used by the US Department of Defence. Ada, though complex and ambitious, is still used for some critical systems, alongside a minority of projects or functions.
Features of Ada include: strong typing, modular programming mechanisms (packages), run-time checking, parallel processing (tasks, synchronous message passing, protected objects, and nondeterministic select statements), exception handling, and generics.
It was originally developed in the early 1980s (this version is generally known as Ada 83) by a team led by Dr. Jean Ichbiah at CII-Honeywell-Bull in France.
While there have been a number of hopeful starts, the only OS written in Ada I'm aware of that has achieved some semblance of completeness is MaRTE OS, which is designed as a "a Hard Real-Time Operating System for embedded applications".
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