I can reproduce this problem with the following code:

package main

import (
    "log"
    "github.com/howeyc/fsnotify"
)

func main() {
    watcher, err := fsnotify.NewWatcher()
    if err != nil {
        log.Fatal(err)
    }

    done := make(chan bool)

    go func() {
        for {
            select {
            case ev := <-watcher.Event:
                log.Println("event:", ev)
            case err := <-watcher.Error:
                log.Println("error:", err)
            }
        }
    }()

    err = watcher.Watch("/Volumes/User/Home/Desktop/a")
    if err != nil {
        log.Fatal(err)
    }

    <-done
}

In the a directory, when I run touch a s d f g h k l, it outputs:

2014/02/02 03:31:00 event: "/Volumes/User/Home/Desktop/a/a": CREATE
2014/02/02 03:31:00 event: "/Volumes/User/Home/Desktop/a/d": CREATE
2014/02/02 03:31:00 event: "/Volumes/User/Home/Desktop/a/s": CREATE
2014/02/02 03:31:00 event: "/Volumes/User/Home/Desktop/a/l": CREATE

This happens only on OS X, on Linux, it works as expected.

I'm not sure if this is a bug from this library or from the operating system. I used to use the file watcher in Java7, the Mac version is also less responsive than Linux and Windows. Seems the Mac version is using polling, where as Linux and Windows are using callback. I'm not quite sure about the details.

Several problem on OS X #82

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