Detect if event loop is busy.

Example

var busyLoop = require('busy-loop'),

busyLoop(function(amount) {
    console.log('Loop was busy for', amount, 'ms');
});

Api busy([options], callback)

Optional options:

- `max` max time in ms alowed to be busy, default is 50ms
- `interval` how often to check the state in ms, default is 1000ms

Optional callback is called every time the event loop was busy for longer amount of time than defined in max. Passed value is amount of ms the loop was blocked for.