Questions on Build 18-loom+5-274 (2021/11/15)

[Alan Bateman]

On 23/11/2021 20:42, Eric Kolotyluk wrote:
> Mike, as I have discovered, StructuredExecutor.open() functions like 
> newVirtualThreadPerTaskExecutor(), one thread per task.
>
> While initially, I experimented with 
> newVirtualThreadPerTaskExecutor(), I now only use StructuredExecutor 
> because it's a better solution.
>

We can summarize this as ExecutorService for unstructured, 
StructuredExecutor for structured.

For unstructured, an ExecutorService is "shared" (doesn't have an 
owner), its usually long lived and often saved in static final field. 
Anyone can submit tasks or shut it down. No inheritance of scope locals.

For structured, StructuredExecutor is owned by the thread that creates 
it. It will be use try-with-resources to ensure is it closed, it would 
be a bug to stash one of these executors in a static field. Forking is 
confined to the owner and threads contained in the executor. Scope 
locals are inherited.

-Alan.