Processes

The terms program and process are often used interchangeably. However, there are subtle differences:

 

  • Program = source code and/or compiled machine code. The instructions that tell the computer what to do.
    • Fixed storage size
  • Process = instance of a running program. The code loaded into memory, operating and working on data
    • Variable storage size (in working memory)
    • Includes the storage requirements of the loaded program plus its data

A unique pid (process ID) is assigned by the OS kernel to each process as an index for various data relating to the process

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