Process Control Block (PCB)

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Process Control Block (PCB) is information associated with each process, which may also be a called a "task control block." It is a data structure that keeps track of process metadata.


  • Process state - running, waiting, etc.
  • Program counter - location of instruction to next execute.
  • CPU registers - contents of all process-centric registers.
  • CPU scheduling information - priorities, scheduling queue pointers.
  • Memory-management information - memory allocated to the process.
  • Accounting information - CPU used, clock time elapsed since start, time limits.
  • I/O status information - I/O devices allocated to process, list of open files.