Implement prefork which invokes bundler.

[ioquatix]

socketry/falcon#53

• Implement Async::Container::Preforked which supports a similar interface to Async::Container::Forked (maybe extract common functionality).
• Pre-fork should fork once, then invoke Bundler.require with an appropriate bundler group (open to ideas, could be hard coded to:preforked or perhaps something more generic). The pre-fork process should spawn children processes, maybe by invoking Async::Container::Forked.
• Relevant specs.

[ioquatix]

Also, I'm fine with the prefork process using exec to replace itself. I'm not sure how well it can work w.r.t passing sockets and other things to child process, but lets try it?

[ioquatix]

@bryanp feel free to join https://gitter.im/socketry/async to discuss any related issues

[ioquatix]

On the following point:

• Pre-fork should fork once, then invoke Bundler.require with an appropriate bundler group (open to ideas, could be hard coded to:preforked or perhaps something more generic). The pre-fork process should spawn children processes, maybe by invoking Async::Container::Forked.

I wonder if it's better to take a block/proc/callback or just invoke a method on the class, so it can be changed by subclass/injection/proc.

[ioquatix]

Okay, this was implemented and is essentially done by using Instance#exec("bundler", "exec", ...).