fibers-does-not-block.js

console.log("script begin");
var Fiber = require('fibers');

Fiber(function() {
	var fiber = Fiber.current;
	setTimeout(function() {
		console.log("setTimeout callback begin");
		fiber.run();
		console.log("setTimeout callback end");
	}, 10000)
	console.log(">>> before Fiber.yield()");
	Fiber.yield();
	console.log(">>> after Fiber.yield()");
}).run();

setInterval(function() {
	console.log("setInterval callback");
}, 1000);
console.log("script end");

Output:

$ node fibers-does-not-block
script begin
>>> before Fiber.yield()
script end
setInterval callback
setInterval callback
setInterval callback
setInterval callback
setInterval callback
setInterval callback
setInterval callback
setInterval callback
setInterval callback
setTimeout callback begin
>>> after Fiber.yield()
setTimeout callback end
setInterval callback
setInterval callback
setInterval callback
setInterval callback
^C