How Program Becomes a Process. How OS makes Program a process

Question

I wanted to know How OS actually makes a program in to process. what are steps Os engages to make program a process.

I mean How a Program becomes a Process, what are the parameter OS adds to kernel datastructure before making a program a process

Thank you in advance.

Answer 1

There's a tonne of info on the net...

• Delve into UNIX process creation (IBM)
• Windows Processes and Threads (InformIT)

Cheers. Keith.

Answer 2

Every operating system is going to do this in a different manner.

However, in general the following steps will occur in a modern operating system:

• New address space created
• Program image loaded into an agreed upon address
  • This may involve relocation of the image, or a dependency.
• Execution "context" setup
  • Includes stack, and a call into an agreed upon "main" function by a logical thread of execution

I'm glossing over lots of nasty little details, but that's a basic overview.