使用方式：

接口文档：

https://pkg.go.dev/github.com/gogf/gf/v2/os/gmlock

func Lock(key string)
func LockFunc(key string, f func())
func RLock(key string)
func RLockFunc(key string, f func())
func RUnlock(key string)
func Remove(key string)
func TryLock(key string) bool
func TryLockFunc(key string, f func()) bool
func TryRLock(key string) bool
func TryRLockFunc(key string, f func()) bool
func Unlock(key string)
type Locker
    func New() *Locker
    func (l *Locker) Lock(key string)
    func (l *Locker) RLock(key string)
    func (l *Locker) RLockFunc(key string, f func())
    func (l *Locker) RUnlock(key string)
    func (l *Locker) Remove(key string)
    func (l *Locker) TryLock(key string) bool
    func (l *Locker) TryLockFunc(key string, f func()) bool
    func (l *Locker) TryRLock(key string) bool
    func (l *Locker) TryRLockFunc(key string, f func()) bool
    func (l *Locker) Unlock(key string)

执行后，输出结果为：

2018-10-15 23:57:28.295 9
2018-10-15 23:57:29.296 0
2018-10-15 23:57:30.296 1
2018-10-15 23:57:32.296 3
2018-10-15 23:57:34.297 5
2018-10-15 23:57:35.297 6
2018-10-15 23:57:36.298 7
2018-10-15 23:57:37.298 8

示例2，TryLock非阻塞锁

TryLock方法是有返回值的，它表示用来尝试获取锁，如果获取成功，则返回true；如果获取失败（即互斥锁已被其他goroutine获取），则返回false。

执行后，输出结果为：

2018-10-16 00:01:59.172 9
2018-10-16 00:01:59.172 false
2018-10-16 00:01:59.172 false
2018-10-16 00:01:59.172 false
2018-10-16 00:01:59.172 false
2018-10-16 00:01:59.172 false
2018-10-16 00:01:59.172 false
2018-10-16 00:01:59.172 false
2018-10-16 00:01:59.176 false