Tor源码分析 -- Main

Main file serves as the primary location for executing key functions within the Tor system. These functions are numerous, but they are relatively fewer compared to those in files handling more basic processing operations. As a result, in its current stage, a concise analysis is deemed appropriate. Within this scope, some less common and non-significant modules have been removed. It is recommended that users explore the source code for further details.

1. 全局变量

全局变量在文件头部进行声明或说明，并且每个全局变量都已具备详尽的英文分析与解释，在此基础上进行简明扼要的列举

系统在先前阶段的读取和写入字节数，并包含用于流量控制的令牌桶全局变量。（两者之间的差异由refill回调函数负责调节）

令牌桶被用来管理整个系统