使用gettimeofday测试函数运行的时间

#include <time.h>   
#include <stdio.h>   
#include<sys/time.h>  

#define NEW_TIME_VALE
    struct timeval startTime,endTime;      float Timeuse;    
#define START_GETTIME \    
    gettimeofday(&startTime,NULL);  
#define END_GETTIME \
    gettimeofday(&endTime,NULL);      Timeuse = 1000000*(endTime.tv_sec - startTime.tv_sec) + (endTime.tv_usec - startTime.tv_usec);      Timeuse /= 1000000;      printf("Timeuse = %f\n",Timeuse);    
void main()
{
    NEW_TIME_VALE
    START_GETTIME
    
    sleep(1);
    
    END_GETTIME
}