PCB generally includes

　　1. Program ID (PID, process handle): It is unique, and each process must correspond to a PID. PID is usually an integer number

　　2. Feature information: general subsystem processes, user processes, or kernel processes, etc

　　3. Process status: running, ready, blocked, indicating the current running status of the process

　　4. Priority: Indicates the priority size for obtaining CPU control

　　5. Communication information: a reflection of the communication relationship between processes, as the operating system provides communication channels

　　6. On site protection zone: used to protect blocked processes

　　7. Resource requirements and allocation control information

　　8. Process entity information, indicating the program path and name, whether the process data is in physical memory or in swap partitions (pagination)

　　9. Other information: work unit, workspace, file information, etc