获取此变量的第一个地址字段。
获取此变量的第三个地址字段。
获取此变量的第二个地址字段。
请注意：只有在其中获取地址的线程仍然存在的情况下，线程本地变量的地址才有效。
Note that the address of a thread local variable is valid only as long as the thread in which the address was taken still exists.
当你的叉子，新孩子有效地获取完整的拷贝父进程的地址空间和变化的变量在父母不在的孩子看到的，反之亦然。
When you fork, the new child effectively gets a complete copy of the parent's address space and changes to variables in the parent will not be seen in the child, and vice versa.
当你的叉子，新孩子有效地获取完整的拷贝父进程的地址空间和变化的变量在父母不在的孩子看到的，反之亦然。
When you fork, the new child effectively gets a complete copy of the parent's address space and changes to variables in the parent will not be seen in the child, and vice versa.
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