[LinuxC]毫秒级时间间隔计算程序实例

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

long long timeum(){
struct timeval tim;
gettimeofday (&tim , NULL);
return (long long)tim.tv_sec*1000000+tim.tv_usec;
}

int main(){
//example
long long start = timeum();

int i;
for(i = 0; i<10000; i++){};

printf("%lld\n",timeum()-start);

return 0;
}