A process is a dynamic entity, from creation to extinction, which is the entire life cycle of a process. Process possible

Will experience a variety of different states, generally there are three states.

+ Ready state: The process has obtained all other resources except cpu, waiting for cpu scheduling in the ready queue

+ Execution status: The cpu has been obtained and all required resources are running

+ blocking state (waiting state): The process abandons the processor or waits for the required resources

I don’t own the processor, and other resources are not met.

The Processing Control Block is a data structure in the core of the operating system and mainly represents the state of the process. Its function is to make a program (including data) that cannot be run independently in a multi-program environment, become a basic unit that can run independently or a process that is executed concurrently with other processes. In other words, the OS controls and manages the concurrent execution process according to the PCB. The PCB is usually a contiguous memory area in the system memory footprint. It stores all the information needed by the operating system to describe the process and control the running of the process. It makes a program that cannot run independently in a multiprogram environment. A basic unit that can run independently or a process that can execute concurrently with other processes.

 

A process control block (PCB) is a specialized data structure that the system sets up to manage processes. The system uses it to record the external characteristics of the process and describe the process of motion changes. At the same time, the system can use the PCB to control and manage the process, so the PCB (process control block) is the only indicator of the existence of the system-aware process.

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