The new lower-layer adopted POSIX real-time signals as event-driven source, data cache to eliminate unnecessary network data transportation, and independent thread to do DNS domain name resolution job.

• 同时,在底层各个模块中,对于并发网络I/O操作采用POSIX实时信号作为事件驱动机制,配合网页数据缓存来减少不必要的网络传输、再将DNS域名解析操作以独立的线程运行。