特别要注意对远程调用进行日志记录，以及在线程分支、开始和结束的位置进行日志记录。

Pay particular attention to logging around remote calls, and where threads branch, start, and end.

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随后，应用程序可以调用xa_start将一个事务ID (XID)传递给Resource Manager (RM)，将调用者线程与一个事务分支相关联。

Subsequently, the application may call xa_start to pass a transaction ID (XID) to a Resource Manager (RM) to associate the calling thread with a transaction branch.

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Thread of control：告诉事务中的操作是否需要在流程中序列化，或者流程中的多个线程是否可以参与事务分支。

Thread of control: Tells if the operations in a transaction need to be serialized in the process, or if multiple threads in a process can participate in the transaction branch.

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