source:Industry News release time:2023-06-01 Article author:yu Popular:pcb
Some information related to process scheduling and process -related information is also stored in PCB.
(1) Process status. Refer to the current status of the process as the basis of process scheduling and the basis for changing.
(2) Process priority. To describe an integer of the priority of the processing machine, the process with high priority is given priority to obtain the processor.
(3) Other information required for process scheduling. In
(4) Incident. This is an event that the process is transformed from the execution state to the occurrence of the blocking state. (Cover cause) processing machine status information
Explain the current status of the process. In order to manage the convenience, the same state of the process will form a queue during the system design. If the process queue is ready, the waiting process must form multiple waiting queues based on the waiting event, such as waiting for the printer queue, waiting, etc. The processing information of the processor is mainly composed of the contents of various registers of the processor.
General register. Also known as user visual register, it can be accessed by the user's program and used for temporary information.
Instruction register. Stay the address of the next instruction to be accessed.
Program status PSW. It contains status information. (Condition code, execution method, interrupt shielding logo, etc.)
User stack pointer. Each user process has one or several system stacks that are related to them, which are used to store the process and system call parameters and calls. The stack pointer points to the top of the stack.
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