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什么是可重入? 关于可重入和不可重入这些概念网上可以找到很多，这里引用一下WiKi中的解释 a computer program or subroutine is called reentrant if it can be interrupted in the middle of its execution, and then be safely called again (“re-entered”) before its previous invocations complete execution. The interruption could be caused by an internal action such as a jump or call, or by an external action such as an interrupt or signal. Once the reentered invocation completes, the previous invocations will resume correct execution. 简单来说是这样的，可重入指的是一个程序或者函数所具备的性质，该性质指的是一个函数在执行的过程中被中断，程序的执行流跑到另外的一个地方把这个函数重新执行了一次，执行完成后返回被中断的地方再次运行之前的函数，而这个
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