InheritableThreadLocal 更新

InheritableThreadLocal类是ThreadLocal类的一个子类，它用来传递父线程生成的变量到子线程中进行使用。和ThreadLocal类的原理类似，InheritableThreadLocal也使用了Thread类中的inheritableThreadLocals成员变量来存储线程的上下文信息。当子线程创建时，它会从父线程中继承inheritableThreadLocals的值。因此，当父线程更新InheritableThreadLocal的值时，子线程中的InheritableThreadLocal的值也会被更新。这样就实现了在子线程中访问父线程的变量的目的。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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