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NOP

      Schedulerul nu găsește niciun proces
                   available.

T=0
P0(2, 3)

                                                              NOP




T=0


      NEW 0 2 3   => P0(2, 3)    Este creat procesul P0 care are
                                prioritatea 3 și timp de execuție 2
                                           unități de timp
P0(2,3)

      Procesul P0 este planificat (nu există niciun
      proces în nicio coadă cu prioritate mai bună)

T=1
P0(2,3)




T=1


      WAIT 1 1   La pasul următor, procesul aflat în starea RUNNING
                   o să fie trimis în coada WAITING cu indicele 1.
P0(1,3)




                  NOP

      Schedulerul nu găsește niciun proces
                   available.

T=2
P0(1,3)




                                                                     NOP




T=2


      SIGNAL 2 0   Sunt trezite procesele din coada WAITING cu
                    indicele 0. În cazul de față, niciun proces.
P0(1,3)




                  NOP

      Schedulerul nu găsește niciun proces
                   available.

T=3
P0(1,3)


      P1(10, 2)




                                                               NOP




T=3


      NEW 3 10 2 => P1(10, 2)    Este creat procesul P1 care are
                                prioritatea 2 și timp de execuție 10
                                           unități de timp
P0(1,3)




                      P1(10,2)

      Procesul P1 este planificat (nu există niciun
      proces în nicio coadă cu prioritate mai bună)

T=4
P0(1,3)




                                                                            P1(10,2)

                                                        Procesul P1 este planificat (nu există niciun
                                                        proces în nicio coadă cu prioritate mai bună)

T=4


      SIGNAL 4 1      Sunt trezite procesele din coada WAITING cu
                   indicele 1. În cazul de față, procesul P0. Prioritatea
                              acestuia se schimbă din 3 în 2.
P0(1,2)




                          P1(9,2)

                Procesul P1 își continuă execuția


T=5
P0(1,2)




                                 P1(8,2)

                Procesul P1 își continuă execuția. La sfârșitul
                   acestui moment de timp, va termina de
                 executat 3 unități de timp. Scheduler-ul va fi
T=6                                rechemat.
P0(1,2) P1(7,2)




sfârșit T = 6
                              Este rechemat scheduler-ul.
P1(7,2)




                       P0(1,2)

                Procesul P0 este planificat.


T=7
P1(7,2)




sfârșit T = 7          Procesul P0 s-a terminat.
                      Este rechemat scheduler-ul.
P1(7,2)

      Procesul P1 este planificat.


T=8
P1(6,2)

      Procesul P1 își continuă execuția.


T=9
P1(5,2)

         Procesul P1 își continuă execuția. La sfârșitul
            acestui moment de timp, va termina de
          executat 3 unități de timp. Scheduler-ul va fi
T = 10     rechemat. Neexistând un alt proces, va fi
                        planificat tot P1.
P1(4,2)

         Procesul P1 își continuă execuția.


T = 11
P1(3,2)

         Procesul P1 își continuă execuția.


T = 12
P1(2,2)

         Procesul P1 își continuă execuția. La sfârșitul
            acestui moment de timp, va termina de
          executat 3 unități de timp. Scheduler-ul va fi
T = 13     rechemat. Neexistând un alt proces, va fi
                        planificat tot P1.
P1(1,2)

         Procesul P1 își continuă execuția.


T = 14
NOP




T = 15

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Planificator simplu de procese

  • 1. NOP Schedulerul nu găsește niciun proces available. T=0
  • 2. P0(2, 3) NOP T=0 NEW 0 2 3 => P0(2, 3) Este creat procesul P0 care are prioritatea 3 și timp de execuție 2 unități de timp
  • 3. P0(2,3) Procesul P0 este planificat (nu există niciun proces în nicio coadă cu prioritate mai bună) T=1
  • 4. P0(2,3) T=1 WAIT 1 1 La pasul următor, procesul aflat în starea RUNNING o să fie trimis în coada WAITING cu indicele 1.
  • 5. P0(1,3) NOP Schedulerul nu găsește niciun proces available. T=2
  • 6. P0(1,3) NOP T=2 SIGNAL 2 0 Sunt trezite procesele din coada WAITING cu indicele 0. În cazul de față, niciun proces.
  • 7. P0(1,3) NOP Schedulerul nu găsește niciun proces available. T=3
  • 8. P0(1,3) P1(10, 2) NOP T=3 NEW 3 10 2 => P1(10, 2) Este creat procesul P1 care are prioritatea 2 și timp de execuție 10 unități de timp
  • 9. P0(1,3) P1(10,2) Procesul P1 este planificat (nu există niciun proces în nicio coadă cu prioritate mai bună) T=4
  • 10. P0(1,3) P1(10,2) Procesul P1 este planificat (nu există niciun proces în nicio coadă cu prioritate mai bună) T=4 SIGNAL 4 1 Sunt trezite procesele din coada WAITING cu indicele 1. În cazul de față, procesul P0. Prioritatea acestuia se schimbă din 3 în 2.
  • 11. P0(1,2) P1(9,2) Procesul P1 își continuă execuția T=5
  • 12. P0(1,2) P1(8,2) Procesul P1 își continuă execuția. La sfârșitul acestui moment de timp, va termina de executat 3 unități de timp. Scheduler-ul va fi T=6 rechemat.
  • 13. P0(1,2) P1(7,2) sfârșit T = 6 Este rechemat scheduler-ul.
  • 14. P1(7,2) P0(1,2) Procesul P0 este planificat. T=7
  • 15. P1(7,2) sfârșit T = 7 Procesul P0 s-a terminat. Este rechemat scheduler-ul.
  • 16. P1(7,2) Procesul P1 este planificat. T=8
  • 17. P1(6,2) Procesul P1 își continuă execuția. T=9
  • 18. P1(5,2) Procesul P1 își continuă execuția. La sfârșitul acestui moment de timp, va termina de executat 3 unități de timp. Scheduler-ul va fi T = 10 rechemat. Neexistând un alt proces, va fi planificat tot P1.
  • 19. P1(4,2) Procesul P1 își continuă execuția. T = 11
  • 20. P1(3,2) Procesul P1 își continuă execuția. T = 12
  • 21. P1(2,2) Procesul P1 își continuă execuția. La sfârșitul acestui moment de timp, va termina de executat 3 unități de timp. Scheduler-ul va fi T = 13 rechemat. Neexistând un alt proces, va fi planificat tot P1.
  • 22. P1(1,2) Procesul P1 își continuă execuția. T = 14