Question: running concurrently

[KaiserKarel]

If my user starts multiple instances of my app, does postgresql-embedded ensure that only a single process runs?

Can I also detach the process to make it keep running even if my app exits (useful for CLIs to have quicker startup).

[brianheineman]

@KaiserKarel the crate does not directly provide any facilities to prevent concurrent postgresql processes from running on the same port (aside from what postgresql provides). The crate was specifically written to provide support for ephemeral ports and running multiple instances of postgresql on different ports concurrently in order to facilitate automated tests. You might be able to achieve what you are looking for by first detecting if postgresql is running pg_isready, then starting it if necessary. Here is a utility for pg_isready