Do not migrate tasks to a different thread pool (backport of #1159)

[Drvi]

No description provided.

[IanButterworth]

This seems like functionality Base should have. Is there a feature request for it?

[Drvi]

@IanButterworth I'm not aware, but I think that would be Threads.@spawn Threads.threadpool() ....

[Drvi]

I think the tests are broken on 1.11+ because we're touching internals that changed with the Memory PR.

[IanButterworth]

Threads.@spawn Threads.threadpool()

That looks good to me. Any reason not to use that?

[Drvi]

Any reason not to use that?

The macro from ConcurrentUtilities is compatible with older Julia versions:

macro samethreadpool_spawn(expr)
    if VERSION >= v"1.9.2"
        esc(:(Threads.@spawn Threads.threadpool() $expr))
    else
        esc(:(Threads.@spawn $expr))
    end
end

Since we depend on the packege already and given the original PR also went this route, I simply did the same.

[NHDaly]

makes sense to me 👍