package unsafe;

import sun.misc.Unsafe;

import java.lang.reflect.Constructor;

/**

* Created by 李恒名 on 2017/6/21.

*/

public class UnsafeLock {

private Unsafe unsafe;

public UnsafeLock() {

try {

//获得Unsafe的构造器

Constructor<Unsafe> constructor = Unsafe.class.getDeclaredConstructor();

//突破私有访问权限

constructor.setAccessible(true);

//创建示例

this.unsafe = constructor.newInstance();

} catch (Exception e) {

e.printStackTrace();

}

}

public void lock(Object obj) {

unsafe.monitorEnter(obj);

}

public void unlock(Object obj) {

unsafe.monitorExit(obj);

}

}