Operating Systems Process Concept c An operating system executes a variety of programs H Batch system- jobs H Time-shared systems-user programs or tasks g Textbook uses the terms job and process almost interchangeably. G Process execution must progress in sequential fashion A process includes: a program counter程序计数器 stack栈 u data section数据部分 Gao Haichang, Software School, Xidian UniversityOperating Systems Gao Haichang , Software School, Xidian University 5 Process Concept  An operating system executes a variety of programs:  Batch system – jobs  Time-shared systems – user programs or tasks  Textbook uses the terms job and process almost interchangeably.  Process execution must progress in sequential fashion.  A process includes:  program counter 程序计数器  stack 栈  data section 数据部分