系统时间，以毫秒为单位c ++

time_t rawtime;
struct tm * timeinfo;

time ( &rawtime );
timeinfo = localtime ( &rawtime );

long callTime=timeinfo->tm_hour*3600+timeinfo->tm_min*60+timeinfo->tm_sec;
q.push( Call( callNum, callTime, callLength ));

gettimeofday

gettimeofday()

gettimeofday()

time()

struct timespec ts;
clock_gettime(CLOCK_MONOTONIC,&ts);
// do some action ....
struct timespec ts2;
clock_gettime(CLOCK_MONOTONIC,&ts2);
std::cout << \"spend \" << ts2.tv_nsec - ts.tv_nsec << \" nanoseconds\" << std::endl;