ただ、スレッド立ち上げてスリープして待ち合わせて返り値を受け取る、そんな処理をいくつかの言語で書いてみました。
浅く広く。

JavaScript

Promise<T>のみ

const A=new Promise(
	resolve=>{
		console.log("Promise Start");
		setTimeout(
			()=>resolve("Promise OK!"),
			1000
		);
	}
);

console.log("Waiting...");
A.then(val=>{
	console.log("done!");
	console.log(val);
});

Generatorのみ

const g=(function*(){
	const A=(()=>{
		const gA=(function*(){
			console.log("Generator Start");
			yield setTimeout(()=>gA.next(),1000);
			g.next("Generator OK!");
		})();
		gA.next();
	})();

	console.log("Waiting...");
	A_result=yield A;
	console.log("done!");
	console.log(A_result);
})();
g.next();

Generator & Promise<T>

const g=(function*(){
	const A=new Promise(
		resolve=>{
			console.log("Promise Start");
			setTimeout(
				()=>resolve("Promise OK!"),
				1000
			);
		}
	);

	console.log("Waiting...");
	yield A.then(()=>g.next());
	console.log("done!");
	console.log(yield A.then(val=>g.next(val)));
})();
g.next();

Async/Await(TypeScript & ES.Next)

(async function(){
	const A:Promise<string>=(async function(){
		console.log("Promise Start");
		await new Promise(resolve=>setTimeout(resolve,1000));
		return "Promise OK!";
	})();

	console.log("Waiting...");
	await A;
	console.log("done!");
	console.log(await A);
})();

VB.NET

Task(Of T)

Imports System.Console
Imports System.Threading
Imports System.Threading.Tasks

Module Program
	Sub Main(args() As string)
		Dim A As Task(Of String)=Task.Run(
			Function()
				WriteLine("Task Start")
				Thread.Sleep(1000)
				Return "Task OK!"
			End Function
		)

		WriteLine("Waiting...")
		A.Wait()
		WriteLine("done!")
		WriteLine(A.Result)
	End Sub
End Module

Async/Await

Imports System.Console
Imports System.Threading
Imports System.Threading.Tasks

Module Program
	Sub Main(args() As string)
		Ctype(Async Function()
			Dim A As Task(Of String)=CType(Async Function()
				WriteLine("Task Start")
				Await Task.Delay(1000)
				Return "Task OK!"
			End Function,Func(Of Task(Of String)))()

			WriteLine("Waiting...")
			Await A
			WriteLine("done!")
			WriteLine(Await A)
		End Function,Func(Of Task))().Wait()
	End Sub
End Module

C#

Task<T>

using System;
using System.Threading;
using System.Threading.Tasks;

class Program{
	static void Main(){
		Task<string> A=Task.Run(
			()=>{
				Console.WriteLine("Task Start");
				Thread.Sleep(1000);
				return "Task OK!";
			}
		);

		Console.WriteLine("Waiting...");
		A.Wait();
		Console.WriteLine("done!");
		Console.WriteLine(A.Result);
	}
}

Async/Await

using System;
using System.Threading;
using System.Threading.Tasks;

class Program{
	static void Main(){
		new Func<Task>(async delegate(){
			Task<string> A=new Func<Task<string>>(async ()=>{
				Console.WriteLine("Task Start");
				await Task.Delay(1000);
				return "Task OK!";
			})();

			Console.WriteLine("Waiting...");
			await A;
			Console.WriteLine("done!");
			Console.WriteLine(await A);
		})().Wait();
	}
}

C++

future/async(C++11)

#include <iostream>
#include <thread>
#include <future>
using namespace std;

int main(){
	future<const char *> A=async(launch::async,
		[]{
			cout<<"future Start"<<endl;
			this_thread::sleep_for(chrono::milliseconds(1000));
			return "future OK!";
		}
	);

	cout<<"Waiting..."<<endl;
	A.wait();
	cout<<"done!"<<endl;
	cout<<A.get()<<endl;
}

D言語

core.thread

import std.stdio;
import core.thread;

void main(){
	string A_result;
	Thread A=new Thread(
		delegate(){
			writeln("Thread Start");
			Thread.sleep(dur!"msecs"(1000));
			A_result="Thread OK!";
		}
	);
	A.start;

	writeln("Waiting...");
	A.join;
	writeln("done!");
	writeln(A_result);
}

Ruby

Thread

a_result=""
A=Thread.new do
	puts "Thread Start"
	sleep 1
	a_result="Thread OK!"
end

puts "Waiting..."
A.join
puts "done!"
puts a_result

Clojure

future(CLR版)

(let [A (future
		(println "future Start")
		(System.Threading.Thread/Sleep 1000)
		"future OK!"
	)]

	(println "Waiting...")
	(deref A)
	(println "done!")
	(println (deref A))
)
(shutdown-agents)

HSP

mist

#runtime "hsp3cl"
#include "kernel32.as"
#include "mist.hsp" ;http://fe0km.blog.fc2.com/blog-entry-65.html

mstOpenHspLib
if 0:Sleep 0
mstCaptDll

mstBind "A_result",A_result
mstCompile {"
	#deffunc A
		mes "mstThread Start"
		Sleep 1000
		A_result="mstThread OK!"
	return

	#deffunc mainThread str val
		mes val
	return
"}
mstSetWorkerNum 2
mstThreadCall "A"
mstThreadCall "mainThread","Waiting..."
mstThreadJoin

mes "done!"
mes A_result

実行環境

JavaScript: node v6.9.1
TypeScript: tsc 1.8.10
VB.net: vbc 14.0.1055
C#: csc 4.6.1055.0
C++: cl Version 18.00.40629
D言語: dmd v2.066.1
Ruby: ruby 2.0.0p481
Clojure: Clojure-CLR 1.8.0
HSP: 3.4