请问下redis版本的GetOrSetFuncLock怎么没有实现lock功能

[anythink-wx]

// GetOrSetFuncLock retrieves and returns the value of <key>, or sets <key> with result of
// function <f> and returns its result if <key> does not exist in the cache. The key-value
// pair expires after <duration>.
//
// It does not expire if <duration> == 0.
// It does nothing if function <f> returns nil.
//
// Note that the function <f> should be executed within writing mutex lock for concurrent
// safety purpose.
func (c *Redis) GetOrSetFuncLock(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (interface{}, error) {
	return c.GetOrSetFunc(ctx, key, f, duration)
}

代码里直接调用的 GetOrSetFunc 方法，导致并发的时候会穿透到底层