COSC 4330                   QUIZ #1                      July 16, 1998

Closed Book.   You can have one sheet of notes.

1.   Complete the following sentences: (4×10 points)

     In a modern computer system, a disk access takes around ten
     __________________ (indicate the time unit).

     ___________________________ allows the CPU to continue to do useful
     work while a program waits for the outcome of an I/O operation.

     When a process issues a system call,it goes from the
     ______________ state to the _______________ state.

     Processes waiting for the CPU are stored in the
     _______________________ queue.

2.   What is a privileged instruction? (10 points)  Which instructions
     should be privileged and why?(10 points)
  
3.   What is the major disadvantage of microkernels? ( 20 points)
  
4.   Complete the following C program so it will always print "Hello!"
     followed by "Good-bye!" (20 points)

      main() {
         int pid;
         if ((pid = fork()) == 0) {
            printf("Hello!\n");
             _______________
    
         } // if
         _________________
         printf ("Good-bye!\n");
      } // main
--IMPORTANT----IMPORTANT----IMPORTANT----IMPORTANT----IMPORTANT--
Please do not try to answer these questions by yourself BEFORE
having a clear idea of what's on the test for which you are
studying.

Materials covered in each test DO VARY from semester to semester
because the pace of the course can change, some materials are be
added and other deleted almost every semester.
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