built-in Governor compositions

[michaelficarra]

Sometimes you have a process that depends on more than one limited resource. If you're invoking the Governor protocol yourself, you can just do this with Promise.all. But if you're passing it to an API that expects a Governor parameter, you'd have to re-wrap it up using the Governor interface. Similarly, if you want it to be usable with using, you'd have to implement the Explicit Resource Management protocol. We should provide a Governor composition function Governor.all.

What I've described is a product operation. Would a sum operation also be useful? I imagine so but probably not anywhere near as commonly.

[michaelficarra]

I think this could also help in avoiding deadlocks? If you have two consumers both trying to acquire 2 resources, each of them could acquire 1, preventing the other conumer from acquiring the other resource. If the 2 governors for the resources were composed first, they could avoid this deadlock.