theleancoder

// extract a core module like this
var http = require('http);
 
// extract a user defined module like this
var something = require('./folder1/folder2/folder3/something.js');

theleancoder

if (typeof Object.create !== 'function') {
	Object.create = function (o) {
		var F = function () {};
		F.prototype = o;
		return new F();
	};
 
var otherPerson = Object.create(person);

theleancoder

// take order for table 1 and move on...
orderNonBlocking(['Coke', 'Iced Tea'], function(drinks){
  return serveOrder(drinks);
});
 
// take order for table 2 and move on...
orderNonBlocking(['Beer', 'Whiskey'], function(drinks){
  return serveOrder(drinks);
});
 

theleancoder

// take order for table 1 and wait...
var order1 = orderBlocking(['Coke', 'Iced Tea']);
 
// once order is ready, take order back to table.
serveOrder(order1);
// once order is delivered, move on to another table.
 
// take order for table 2 and wait...
var order2 = orderBlocking(['Coke', 'Water']);
 

theleancoder

wait(mutex)
    //safely use shared resource
    release(mutex)

theleancoder

wait(mutex)
    //safely use shared resource
    release(mutex)

theleancoder

wait(S) {
    if(S <= 0)
        /* wait */
    S--;
}

theleancoder

signal(S) {
    S++;
}
 

theleancoder

release() {
    available = true;
}

theleancoder

acquire() {
    while (!available)
        /* schedule another process */
    available = false
}
do {
    acquire lock
        critical section
    release lock
    remainder section