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A program in execution is called a process. There exist a number of process states, attributes of a process, state transitions in a process, etc. The process control block is also an important characteristic of a process. To read in detail, just scroll down.
A process is a program in execution. It is the basic unit of resource allocation in an operating system. A process has a starting and ending point. It must execute and progress sequentially. A process is controlled and scheduled by the operating system.
An operating system executes different programs depending on the system. A program is a passive entity. It specifies the logic of data manipulation and I/O actions. A program does not perform the actions itself. A process is an active entity that uses system resources. It performs the actions specified in the program.
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Following are some important attributes of the process:
Process states describe the character of current activity during a process. The state of a process changes because it executes. A method could also be in one in all the following states:
Different state transitions during a process are as follows:
The process control block may be a data structure. It contains all data for a process to be used for controlling its execution. It additionally contains the data associated with the resource allotted to the process. Each method has its own PCB.
The process control block is incredibly vital. It ought to be kept in a protected space wherever the user cannot access it. The information that has got to be saved usually consists of the following:
Pointer | State |
Process Number | |
Program Counter | |
Registers | |
Memory Limits | |
List of Open Files |
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