Also, the Zig 0.16.0 preview nightly builds includes a new Io library[0]. I have not used libxev or Tigerbeetles event loop, but I believe the standard Zig implementation is likely largely influenced by those two.

[0] https://ziglang.org/documentation/master/std/#std.Io, or https://ziglang.org/documentation/0.16.0/std/#std.Io after the release