The topic is memory safety, not concurrency support, FWIW. Lua would have been a good candidate: memory safe, coroutine to structure the code in a concurrent-i

The topic is memory safety, not concurrency support, FWIW. Lua would have been a good candidate: memory safe, coroutine to structure the code in a concurrent-ish way if needed, and you have a configuration file parser for free (just use Lua as the configuration language, it was its very first purpose after all).