实用技巧一则 Linux系统对文件进行加锁

if((flock(fd, LOCK_EX | LOCK_NB))< 0)
        {       
                std::cout<<"Log::The log have been locked"<<std::endl;
                return FALSE;
        }

if((flock(fd, LOCK_UN ))<0)
        {
                std::cout<<"Log::unlock the logfile error"<<std::endl;
                return FALSE;
        }