exec-queue/index.js

Safely run exec in a loop.

// Generated by CoffeeScript 1.6.3
(function() {
  var MAX_PROCS, exec, nextInLine, queue;

  MAX_PROCS = 10;

  exec = require('child_process').exec;

  queue = [];

  nextInLine = function() {
    if (queue.length > 0) {
      return exec.apply(null, queue.shift());
    }
  };

  module.exports = function() {
    var args, oldCb;
    args = Array.prototype.slice.call(arguments);
    oldCb = args.pop();
    args.push(function() {
      oldCb.apply(null, arguments);
      return nextInLine();
    });
    queue.push(args);
    if (queue.length < MAX_PROCS) {
      return process.nextTick(function() {
        return nextInLine();
      });
    }
  };

}).call(this);