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Operating System



                   Service Call                      Service
                  from Process                        Call
                                                Handler (code)










                                                                                      Long-      Short-      I/O
                    Interrupt
                                                                                      Term
                                                                                                 Term
                  from Process                     Interrupt                          Queue      Queue     Queues
                    Interrupt                   Handler (code)
                     from I/O
                                                                                              Short-Term
                                                                                               Scheduler
                                                                                                 (code)








                                                                                              Pass Control
                                                                                                to Process





                  Figure 2.11  Key Elements of an Operating System for Multiprogramming
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