Correct Initialization of Io.Evented?

[Sze]

@vulpesx

Just checked, you are using an arena allocator, which is not thread safe.

std.heap.ArenaAllocator was made thread safe recently.

The Allocator implementation provided is threadsafe, given that child_allocator is threadsafe as well.

Some related discussion:

Do we really need a thread-safe ArenaAllocator by default?

I noticed that the ArenaAllocator in the master branch has been changed to a lock-free thread-safe implementation. I have serious concerns about this change, so I would like to get more explanation. Although I am a heavy user of ArenaAllocator, nearly 99% of my usage needs are on a single thread. I mainly use ArenaAllocator to amortize the allocation and deallocation overhead of the global allocator (including the thread-safety overhead of the global allocator) and to improve cache locality. Th…