Operating Systems Operating System Definitions e Resource allocator- manages and allocates resources G Control program -controls the execution of user programs and operations of l/o devices G Kernel- the one program running at all times(all else being application programs). Gao Haichang, Software School, Xidian University 10Operating Systems Gao Haichang , Software School, Xidian University 10 Operating System Definitions  Resource allocator – manages and allocates resources.  Control program – controls the execution of user programs and operations of I/O devices .  Kernel – the one program running at all times (all else being application programs)