Protothreads是一种针对C语言封装后的宏函数库，为C语言模拟了一种无堆栈的轻量线程环境，能够实现模拟线程的条件阻塞、信号量操作等操作系统中特有的机制，从而使程序实现多线程操作。(Protothreads is a kind of macro C language library package after the simulation without a stack of lightweight threads for the C language environment, the u