Paralell startup

[Kenneth Porter]

--On Wednesday, October 20, 2004 5:09 PM -0400 Jeff Spaleta 
<jspaleta at gmail.com> wrote:

> Services scripts can have conditional logic...
> foo initscript
> if network is running do this
> if network is not running do that
> bar initscript
> if sshd is running do this
> if sshd is not running do that

This is a boot-centric way of looking at the problem. Instead, think 
hot-plug. foo has two scripts, one that runs right away without a 
dependency, and the other runs when the network hot-plugs into existence, 
after the first script signals that it's done. Everything can be 
event-driven.

I followed Jeff Pitman's link and his page has a link to Richard Gooch's 
interesting "need" scheme:

<http://www.atnf.csiro.au/people/rgooch/linux/boot-scripts/>

It looks like this scheme stores the dependency graph in init's memory, so 
shutting down a service should also shut down its dependencies first. (When 
considering a boot scheme, you also need to consider its effect on shutdown 
and runlevel-change processing.)