unix-linux下多功能定时器，可以有多个alarm，线程安全。-unix-linux under the multi-function timer, you can have more than one alarm, thread-safe.

一个用于嵌入式Linux的库，包含文件，网络，线程，定时器等常用模块。-For an embedded Linux database, include file, network, threads, timers and other commonly used modules.