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                            #### 鎖的升級

Java SE1.6為了減少獲得鎖和釋放鎖所帶來的性能消耗，引入了“偏向鎖”和“輕量級鎖”，所以在Java SE1.6里鎖一共有四種狀態，無鎖狀態，偏向鎖狀態，輕量級鎖狀態和重量級鎖狀態，它會隨著競爭情況逐漸升級。鎖可以升級但不能降級，意味著偏向鎖升級成輕量級鎖后不能降級成偏向鎖。這種鎖升級卻不能降級的策略，目的是為了提高獲得鎖和釋放鎖的效率
![](https://img.kancloud.cn/04/b8/04b85ceeb9e0f634db0f360182bc5b45_1080x346.png)

```
待論證：當JVM 進入安全點（SafePoint）的時候，會檢查是否有閑置的 Monitor，然后試圖進行降級
```




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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