what is process and structure of process

Process – a process will need certain resources such as CPU, memory, input/output device to accomplish its task system consist of a collection of process –

·        Operating system process executes system code

·        User process execute user code

A process contain only a single thread of control as it run

Ø  Process concept –

·        Process structure

·        Process state

·        PCB(process control block)

·        Threads

1)       Process structure –

              Process in memory

Text Section: A Process is also sometimes known as the Text Section. It also includes the current activity represented by the value of Program Counter.
Stack: Stack contains the temporary data such as function parameters, returns address and local variables.
Data Section: Contains the global variable.
Heap Section: Dynamically allocated memory to process during its run time.

Process vs program - A process is a program in execution. For example, when we write a program in C or C++ and compile it, the compiler creates a binary code. The original code and Binary code, both are programs. When we actually run the binary code, it becomes a process.

A process is an ‘active’ entity as opposed to a program which is considered to be a ‘passive’ entity. A single program can create many processes when run multiple times, for example when we open a .exe or binary file multiple times, many instances begin (many processes are created).

Process	Program
A process is an active activity.	A program is an passive activity
A program becomes a process when it is in execution mode.	A program containing a list of instruction stored on disk.