[Linux] 取得時間及計時

Linux user space取得時間方式及計時方式

struct timeval結構內容

struct timeval 
{
   time_t tv_sec;/* seconds */   
   suseconds_t tv_usec;/* microseconds */   
}

計算時間範例:

#include<sys/time.h>

struct timeval start;
struct timeval end;
unsigned long interval;

/*Get the time point before the delay*/
gettimeofday(&start, NULL);

/*Delay 100ms*/
delay(100);

/*Get the time point after the delay*/
gettimeofday(&end, NULL);

/*Interval */
interval = 1000000 * (end.tv_sec - start.tv_sec) + end.tv_usec - start.tv_usec;
printf("interval is %ld\n",interval );