Linux应用层的精确延迟函数

#include
#include
#include
void mdelay(int ms_count)
{
    struct timeval tpStart, tpEnd;
        float timeUse;
    gettimeofday(&tpStart, NULL);
    do {
        gettimeofday(&tpEnd, NULL);
        timeUse = 1000 * (tpEnd.tv_sec - tpStart.tv_sec) + 0.001 * (tpEnd.tv_usec - tpStart.tv_usec);
    } while(timeUse < ms_count);
}

此种方法独占CPU 不适合太长时间延时