co-spawn

setImmediate for the co generator framework

Calling setImmediate in a co-friendly way is painful and you have to launch co() in your setImmediate function. This is a simple wrapper.

Installation

This module is installed via npm:

$ npm install co-spawn

Example Usage

Non-blocking spawn

var spawn = require('co-spawn');
co(function *() {
  var c = { counter: 0 };
 
  // this will run first
  c.counter++;
 
  // put the following code into another turn of the event loop
  spawn(function *() {
    yield finish(c, done);
  });
 
  // this will run second
  c.counter++;
})();
 
function *finish(c, cb) {
  // this will run last
  c.counter++;
 
  expect(c.counter).to.equal(3);
  done();
}

Blocking spawn

If for some reason you want to block on the spawn, just yield:

var spawn = require('co-spawn');
co(function *() {
  var c = { counter: 0 };
 
  // this will run 1st
  c.counter++;
 
  // put the following code into another turn of the event loop, but block
  yield spawn(function *() {
    yield finish(c, done);
  });
 
  // this will run last
  c.counter++;
})();
 
function *finish(c, cb) {
  // this will run 2nd
  c.counter++;
 
  expect(c.counter).to.equal(2);
  done();
}