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                ### 同步狀態State 在了解數據結構后,接下來了解一下AQS的同步狀態——State。AQS中維護了一個名為state的字段,意為同步狀態,是由Volatile修飾的,用于展示當前臨界資源的獲鎖情況。 ~~~ // java.util.concurrent.locks.AbstractQueuedSynchronizer private volatile int state; ~~~ 下面提供了幾個訪問這個字段的方法: | 方法名 | 描述 | | --- | --- | | protected final int getState() | 獲取State的值 | | protected final void setState(int newState) | 設置State的值 | | protected final boolean compareAndSetState(int expect, int update) | 使用CAS方式更新State | 這幾個方法都是Final修飾的,說明子類中無法重寫它們。我們可以通過修改State字段表示的同步狀態來實現多線程的獨占模式和共享模式(加鎖過程) ![](https://img.kancloud.cn/2a/a5/2aa5356937cadc4ced18a48e947b952c_446x472.png) 對于我們自定義的同步工具,需要自定義獲取同步狀態和釋放狀態的方式
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