synchronizer.js

function create(object) {
  var wait = Promise.resolve();

  function synchronized(func) {
    function next() {
      return func(object);
    }
    return (wait = wait.then(next, next));
  }

  return synchronized;
}

module.exports = {
  create: create,
};

usage.js

var synchronizer = require("./synchronizer");

var locked = false;

function asyncFuncNeedsExclusiveAccessControl(message) {
  if (locked) {
    console.error("FATAL ERROR: LOCKED!!");
    return process.exit(1);
  }
  locked = true;

  return new Promise(function(resolve, reject) {
    setTimeout(function() {
      console.log(message + "!!");

      locked = false;
      resolve(message + ": OK");
    }, 100);
  });
}

var synchronized = synchronizer.create();

synchronized(function() {
  return asyncFuncNeedsExclusiveAccessControl("foo");
}).then(function(res) {
  console.log("-->", res);
});

synchronized(function() {
  return asyncFuncNeedsExclusiveAccessControl("bar");
}).then(function(res) {
  console.log("-->", res);
});