dirlock.go

// +build !windows

package dirlock

import (

    "fmt"

    "os"

    "syscall"

)

type DirLock struct {

    dir string

    f   *os.File

}

func New(dir string) *DirLock {

    return &DirLock{

        dir: dir,

    }

}

func (l *DirLock) Lock() error {

    f, err := os.Open(l.dir)

    if err != nil {

        return err

    }

    l.f = f

    err = syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB)

    if err != nil {

        return fmt.Errorf("cannot flock directory %s - %s", l.dir, err)

    }

    return nil

}

func (l *DirLock) Unlock() error {

    defer l.f.Close()

    return syscall.Flock(int(l.f.Fd()), syscall.LOCK_UN)

}

dirlock.go

原文：http://www.cnblogs.com/zhangboyu/p/7457389.html