osg202

Which is a advantage of implementing threads in the kernel? *

• None of the other choices
• Is good for multiprocessor architecture and if one thread is blocked does not cause the other thread to be blocked
• If one thread is blocked does not cause the other thread to be blocked
• Is good for multiprocessor architecture

Critical Region (Section) concept used in interprocess communication is: *

• A part of shared memory
• None of the other choices
• A part of the program where the shared memory is accessed
• A part of shared data

OS Win32 use system call_____, while OS Unix use system call______ to create a new process *

• fork, CreateProcess
• CreateProcess; fork
• copy, CreateProcess
• CreateProcess; copy

Which statement about disabling interrupts to resolve race conditions is wrong? *

• Disabling/enabling interrupts may negatively affect the I/O system
• User-mode programs are the best place to invoke disableInterrupt()
• In theory, a program can disable interrupts when it enters a critical section, and re-enable interrupts when finished with a critical section, to eliminate race conditions
• Programs with infinite loops in their critical sections are a significant problem with the interrupt-based approach

Which of the events that causes the processes to be created, when an operation system is booted? *

• System initialization
• Execution of a process creation system call
• User request to create a new process
• Initiation of a batch job

Which of the following process state transitions is legal? *

• Blocked (waiting) -> running
• Ready -> Blocked (waiting)
• None of the other choices
• Running -> ready

Which of the following process state transitions is correct, when the external event for which a process was waiting happens? *

• Running -> Blocked (waiting)
• Running -> ready
• Ready -> running
• Blocked (waiting) -> ready

Which of the following process state transitions is correct, when the operating system discovers that process can not continue right now because of is not enough resource? *

• Running -> ready
• Blocked (waiting) -> ready
• Ready -> running
• Running -> Blocked (waiting)

Which of the following statements about semaphores is true? *

• If several processes attempt a P(S) operation simultaneously, only one process should be allowed to proceed.
• A semaphore implementation should guarantee that processes do not suffer indefinite postponement.
• All of the other choices
• P and V (Down and Up) operations should be indivisible operations

Which of the following conditions must be held to provide good solution for mutual exclusion? *

• No process running outside its critical region may block another process
• No process must wait forever to enter its critical region
• No two processes simultaneously in critical region
• All of the other choices
• No assumptions made about speeds or numbers of CPUs