Std.Db.pool

fn

This is a callable function.

What it does

A pool of open connections, shared between threads.

The connections are held in a channel, which is what makes taking one wait

rather than fail when they are all in use: a channel's receive already

blocks until something is there, so the pool needs no waiting of its own.

It also means a pool cannot hand out more connections than it opened, which

is the whole reason a database wants one.

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