Process (ii)--Process Control block

Process (ii)--Process Control block

• Process Control block (PCB, process controls block)

• Definition: The collection of information used by the operating system to manage and control the process
  • The operating system uses PCBs to describe the Basic situation of the process and The process of running the change
  • PCB is the only sign of process existence

    • Each process has a corresponding PCB in the operating system

• Use of Process Control blocks

• Process creation

  • Build the PCB of the process

• Process termination

  • Recycle It's PCB

• Organization and management of processes

  • Through the organization of PCB management to achieve

• Process Control block Contents

• Process Flag Information
• On-site storage of processing machines
• Process Control Information

• Process Control Information

  • Scheduling and status information

    • Scheduling Process and the use of processors

  • Inter-process communication information

    • Various identities related to interprocess communication

  • Storage Management Information

    • Point to process image storage spatial data structure

  • Resources used by the process

    • system resources used by the process , such as opening files, etc.

  • About Data Structure connection information

    • PCB-related process queues

• Organization of Process Control blocks

• Linked list

Same State the process of its PCB into a linked list, multiple states corresponding to a number of different linked lists

• processes in each State form different linked lists: ready linked list, blocking list

• Index Table

Same State process into an index table (from the index to the PCB), multiple states correspond to several different index tables

• processes in each State form a different index table: Ready Index Table, blocking index table

Process (ii)--Process Control block