exec-queue

#Exec Queue
Safely run exec in a loop.

I ran into an Error: spawn EMFILE when trying to call exec too many times
(ie. in a loop). This module safely packages exec so that you may use it in a
loop without creating too many child processes.

##Usage
npm install exec-queue

``javascript
var exec = require('exec-queue');
for (var i = 0; i < 100; ++i) {
exec('ls', function (err, stdout, stderr) {
console.log(stdout);
});
}
`

Try the above example with require('child_process').exec` instead. ;)

The current limit is 10 child processes running simultaneously. I did not test
the limit (maybe it can be queried by OS). If you need more, please file an
issue, as I could add to the API to be able to specify the limit.