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This article will explain in detail what the process is, and the content of the article is of high quality, so the editor will share it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

In a narrow sense, a process is an instance of a running program. In a broad sense, it is a running activity of a program in a computer on a certain data set, the basic unit of resource allocation and scheduling of the system, and the basis of the structure of the operating system. In the traditional operating system, the process is not only the basic allocation unit, but also the basic execution unit.

Narrow definition: a process is an instance of a running program (an instance of a computer program that is being executed).

Broad definition: a process is a running activity of a program with certain independent functions about a data set. It is the basic unit of dynamic execution of the operating system. In the traditional operating system, the process is not only the basic allocation unit, but also the basic execution unit.

In the early process-oriented computer architecture, the process is the basic execution entity of the program; in the contemporary thread-oriented computer architecture, the process is the container of threads. A program is a description of instructions, data and its organizational form, and a process is the entity of a program.

The concept of process has two main points: first, a process is an entity. Each process has its own address space, which generally includes text areas (text region), data areas (data region), and stacks (stack region). The text area stores the code executed by the processor; the data area stores variables and dynamically allocated memory used during process execution; and the stack area stores instructions and local variables for active procedure calls. Second, a process is an "executing program". A program is an inanimate entity, and only when the processor gives life to the program (executed by the operating system) can it become an active entity, which we call a process. [3]

Process is the most basic and important concept in the operating system. After the emergence of the multiprogramming system, in order to describe the dynamic situation in the system and describe the activity law of each program in the system, all multiprogramming operating systems are based on the process.

The reasons why the operating system introduced the concept of process:

From a theoretical point of view, it is an abstraction of the running program process.

From the point of view of implementation, it is a kind of data structure, which aims to clearly describe the inherent law of the dynamic system and effectively manage and schedule the programs running into the main memory of the computer system.

Features

Dynamic: the essence of a process is an execution process of a program in a multiprogramming system. The process is dynamically generated and dies out dynamically.

Concurrency: any process can be executed concurrently with other processes

Independence: the process is not only a basic unit that can run independently, but also an independent unit of system resource allocation and scheduling.

Asynchrony: due to the mutual constraints between processes, the process has the discontinuity of execution, that is, the process moves forward at an independent and unpredictable speed.

Structural features: the process consists of three parts: program, data and process control block.

Multiple different processes can contain the same program: a program forms different processes in different data sets and can get different results, but the program cannot be changed during execution.

About what the process is shared here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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