Process (进程)

Abstract

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• Container that holds all the information needed to run a program, Abstraction (抽象) over running program

  
  

• 2 Components - Address Space, Process Control Block (PCB)

  
  

• Process usually don’t share Main Memory among themselves for isolation purposes. We need Inter-Process Communication (IPC) for inter-process communication

Terminologies

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Core Image

• A suspended Process (进程) consists of its Address Space

Child Process

• Has the same UID as its parent

Process State

1. Running
2. Ready to Run - Could be running but CPU gave processing power to some other Process (进程)
3. Block - Process is waiting for some other things like I/O to finish working (eg. waiting for file to be read)

Process Resources

• The followings are examples of process resources
  • Address Space
  • Register (Include Program Counter and Stack Pointer)
  • A list of open File
  • Outstanding Alarm Signal]
  • List of related processes
  • Process Management information etc