| Homework-2 Version 0 |
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| 👤 Author: by 751815618qqcom 2019-09-18 13:47:45 |
Process is a dynamic entity, from creation to death, is the entire life cycle of a process, it usually has three states: ready state: the process has obtained all resources except CPU, waiting for CPU scheduling in the queue;Execution status: CPU has been obtained and all required resources are running.Blocking: when an executing process is temporarily unable to continue execution due to an event, it abandons the processor and becomes blocked
The PCB records all the information needed by the OS to describe the process and control its operation.PCB make a program (including data) that cannot run independently in a multiprogramming environment a basic unit that can run independently, a process that can execute concurrently with other processes.Throughout the life of a process, the system always controls the process through a PCB. Therefore, each process must have one PCB.
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