Package de.rss.fachstudie.MiSim.resources.cpu.scheduling

Class LIFOScheduler

java.lang.Object
de.rss.fachstudie.MiSim.resources.cpu.scheduling.CPUProcessScheduler
de.rss.fachstudie.MiSim.resources.cpu.scheduling.LIFOScheduler
public class LIFOScheduler
extends CPUProcessScheduler
Last in first out scheduler.

Schedules all entered processes in the reversed order that they arrived in. The processes that entered last, will be retrieved first. Always assigns the full work demand needed for a processes.

Author:
Lion Wagner

  • Constructor Details

    • LIFOScheduler

      public LIFOScheduler​(String name)

  • Method Details

    • enterProcess

      public void enterProcess​(CPUProcess process)
      Enters the process into the scheduling queue.
      Specified by:
      enterProcess in class CPUProcessScheduler
      Parameters:
      process - Process that is to be scheduled
      See Also:
      CPUProcess

    • retrieveNextProcess

      public org.javatuples.Pair<CPUProcess,​Integer> retrieveNextProcess()
      Pulls the next Process to handle and how much demand should be accomplished.
      Specified by:
      retrieveNextProcess in class CPUProcessScheduler
      Returns:
      a pair containing the next process to handle and how much demand should be accomplished.
      See Also:
      CPUProcess

    • retrieveNextProcessNoReschedule

      public org.javatuples.Pair<CPUProcess,​Integer> retrieveNextProcessNoReschedule()
      Pulls the next Process to handle and its assigned time/work quantum.
      Prevents automatic rescheduling of the process like in round robin scheduling.

      This method is used to offer scheduling for multithreading.

      Specified by:
      retrieveNextProcessNoReschedule in class CPUProcessScheduler
      Returns:
      a pair containing the next process to handle and its assigned time quantum.
      See Also:
      CPUProcess

    • hasThreadsToSchedule

      public boolean hasThreadsToSchedule()
      Specified by:
      hasThreadsToSchedule in class CPUProcessScheduler
      Returns:
      true if there is a thread ready to schedule, false otherwise

    • getTotalWorkDemand

      public int getTotalWorkDemand()
      Specified by:
      getTotalWorkDemand in class CPUProcessScheduler
      Returns:
      the sum of the demand remainder of all processes that are currently in queue.

    • clear

      public void clear()
      Clears all current processes from the scheduler
      Specified by:
      clear in class CPUProcessScheduler

    • size

      public int size()
      Specified by:
      size in class CPUProcessScheduler