lockup/test/lockup.js

Lockup uses a certain lock file to queue and deal with inter-process asynchronous resources.

#!/usr/bin/env node

'use strict';

var lockup = require('lockup');

var file = 'foo.lock';
var counter = 0;

function foo(delay){
    var c = counter ++;

    if(c){
        throw 'blah'
    }

    lockup.lock(file, function (err) {
        if(err){
            return console.log(err);
        }

        setTimeout(function () {
            console.log('counter', c);
            
            // release the lock.
            lockup.unlock(file);
        }, delay);
    });
}

foo(1000);
foo(0);