supervisor:restart_child/2 (throttling)

[Sean Hinde]

> Suppose a supervised server tries to acquire some resource when it
> starts, and crashes or terminates if it can't. If the resource is
> unavailable, we don't really want the child to be shut down with
> reached_max_restart_intensity.  The child can avoid this by waiting
> for a fixed time on startup or before crashing, but then the
> availability of the server would be less than optimal (if the child
> has been running correctly for some time, we should try to restart it
> immediately, and begin to delay the restarts only if it keeps 
> crashing).

I'd definitely support this. I find I re-write this sort of functionality
quite often and it would be nice to have it formalised into the supervisor
behaviour. e.g. my erpc thing posted recently uses timers to retry a tcp/ip
connection every few seconds. It would have been very nice to just use
supervisor.

This would go hand in hand with having an 'infinity' retries option as
discussed last year some time on the list.

 -Sean



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