• Include std.x.os.Reactor.

A high-level I/O event reactor interface that wraps over event notification systems like epoll, kqueue.

Plan is to get epoll done first, kqueue second, select third, then iocp/afd fourth.

• Include std.x.os.Socket.setLinger(linger_for_num_seconds: ?u16) !void.
• Include std.x.os.Socket.getRemoteAddress() !std.x.Socket.Address.
• Include std.x.os.Socket.setKeepAlive(enabled bool) !void.
• Include std.x.os.Socket.(r|R)eader(flags) and std.x.os.Socket.(w|W)riter(flags).
• Include Windows version of std.x.os.Socket.
• Generalize std.x.os.Socket to be cross-platform (replace stream read/write-related functions with cross-platform std.x.os.Socket.write, std.x.os.Socket.writeMessage, std.x.os.Socket.read, std.x.os.Socket.readMessage).
• Include cross-platform std.x.os.Buffer (iovec/WSABUF).
• Include cross-platform std.x.os.Socket.Message (msghdr).
• Include cross-platform std.x.os.Socket.Linger (linger).
• Include cross-platform std.x.os.Socket.Address.Storage (sockaddr_storage).
• Include cross-platform std.x.os.Socket.init() flags (async, close on exec).
• Include cross-platform std.x.os.Socket.{read, write, readMessage, writeMessage}() flags.
• Include lockless/lock-free MPMC/MPSC/SPSC queues into std.x.sync.*.
• Implement std.x.tcp.Client.connectToHost.

Implements "happy eyeballs" (IETF RFC 8305). The function signature is as follows:

std.x.tcp.Client.connectToHost(
  hostname: []const u8,
  location: union(enum) {
    port: u16,
    service: []const u8,
  },
);

• Rename std.x.os.IP{v4, v6}.Address to std.x.os.IP{v4, v6}.Endpoint.
• Implement kqueue support for std.x.os.Reactor.
• Prepare to include a thread pool scheduler adapted from kprotty/zap into std.x.sync.
• Include std.x.sync.Waker for abstracting waking/calling async frames/callbacks.
• Include std.x.sync.CancellationToken for a general-purpose cancellation mechanism.
• Kickstart work for async sockets (std.x.net.AsyncSocket (?)).
• Include std.x.os.ctrl_c for cross-platform Ctrl+C handling.
• Kickstart work on blocking/non-blocking sync primitives (i.e. AutoResetEvent, Semaphore, etc.)