效率测试-----时间函数（毫秒级）

 1 #include <time.h>
 2 #include <sys/time.h>
 3 void getCurrentTime(char* buf)    
 4 {   
 5    struct timeval tv;  
 6  
 7    struct timezone tz; 
 8  
 9    struct tm         *p;
10 
11    gettimeofday(&tv,&tz);
12     
13    p = localtime(&tv.tv_sec);  
14 
15    sprintf(buf,"time_now:%d-%d-%d %d:%d:%d.%ld\n", 1900+p->tm_year, 1+p->tm_mon, p->tm_mday, p->tm_hour, p->tm_min, p->tm_sec, tv.tv_usec/1000);  
16 }