Linux下精确到微秒级的时间操作函数

#include #include #include void function()/*用来耗用一定的时间而已，无实际用处的函数*/{unsigned int i,j;double y;for(i=0;i<10000;i++)for(j=0;j<10000;j++)y=sin((double)i);}int main(int argc, char ** argv){struct timeval tpstart,tpend;float timeuse;gettimeofday(&tpstart,NULL);function();gettimeofday(&tpend,NULL);timeuse=1000000*(tpend.tv_sec-tpstart.tv_sec)+tpend.tv_usec-tpstart.tv_usec;timeuse/=1000000;printf("Used Time:%f/n",timeuse);exit(0);}

struct timeval {long tv_sec; /* seconds */long tv_usec; /* microseconds */};