Process (i)--process concept

Processes and Threadsdefinition of the process

a process is a dynamic Execution of a program with a certain independent function on a data set.

the composition of the process

The process contains all the state information for a program that is running

• Code

• Data

• Status Register

  • CPU status CR0, instruction pointer IP

• General purpose Registers

  • AX,BX, CX ...

• Process consumes system resources

  • Open the file. Allocated memory ....

characteristics of the process

• Dynamic nature

• Concurrency of

  • Processes can be independently dispatched and consumed by processor operations

• Independence

• Restriction of

  • Constraints due to access to shared data/resources or inter-process synchronization

process-to-program linkages

• Process is an abstraction of the operating system in the executing State program

  • program = file (static executable file)

  • Process = Program in progress = program + execution Status

• Multiple executions of the same program correspond to different processes

  • Multiple executions of the command "LS" corresponding to several processes

• Required resources for Process execution
  • Memory: Saving code and data
  • CPU: Execution Instructions

the difference between a process and a program

• The process is dynamic and the program is static

  • A program is a collection of ordered code

  • Process is the execution of the program, the process has a kernel mentality/user state

• The process is temporary and the program is permanent.
• The process differs from the composition of the program

  • Process components include program, data, and process control blocks

Process (i)--process concept