How can I deal with this race condtion

Let's say, I'm using cluster to handle the multiple cpus case. Unfortunately, I got a race condition when I tried to rename a file when its siblings are modified.

var cluster = require('cluster'),
    fs = require('fs');
if(cluster.isMaster){
    for(var i=0;i<3;i++){
        cluster.fork();
    }
}else{
    fs.watch('/home/project',function(){
         fs.rename('/home/project/file1.js','/home/project/module1.js',function(er){
              if(er){
                  throw er; //Error: ENOENT, rename '/home/project/file1.js' 
              }
         });
    });
    fs.appendFile('/home/profile/file2.js','some data',function(er){
        if(er){
            throw er;
        }
    });
}

How can I prevent this race condition?