实现了Linux下毫秒级的软件定时,但依赖于系统HZ数,如 HZ=100,最小定时为10ms HZ=1000,最小定时才是1ms 理论上可以实现若干个定时器,依赖于系统性能-Achieved a Linux software under the millisecond timing, but the number depends on the system, HZ, such as HZ = 100, the minimum timin