Linux计算时间间隔

   1: Linux计算时间间隔:

   2:  

   3:  

   4: #include<time.h>    

   5: #include<stdio.h>

   6:  

   7: /*

   8: int gettimeofday(struct timeval *tv, struct timezone *tz); 

   9: int settimeofday(const struct timeval *tv , const struct timezone *tz);

  10: strut timeval {

  11: long tv_sec; /* 秒数 */

  12: long tv_usec; /* 微秒数 */

  13: };

  14: */

  15:  

  16: struct timeval start,end;

  17: int timeuse;

  18:  

  19: void time()

  20: {

  21:     gettimeofday( &end, NULL );

  22:     timeuse = 1000000 * ( end.tv_sec - start.tv_sec ) + end.tv_usec - start.tv_usec; 

  23:     timeuse /= 1000000;

  24:     printf("time used: %ds/n", timeuse);

  25: }

  26:  

  27: void foo()

  28: {

  29:     int i=0;

  30:     for(;i<10000;i++);

  31: }

  32:  

  33: int main()

  34: {

  35:     gettimeofday( &start, NULL );

  36:     foo(); 

  37:     time();

  38:     return 0;

  39: }