Operating System Concepts: Processes - Chapter 3
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Questions and Answers

What mechanism do scheduler activations use to communicate from the kernel to the upcall handler in the thread library?

  • Interrupts
  • Signals
  • Upcalls (correct)
  • Callbacks

    • Which operating system implements a one-to-one mapping between user-level threads and kernel-level threads?

  • Android
  • Mac OS
  • Linux
  • Windows (correct)

    • What does each thread in Windows contain to represent the state of the processor?

  • Thread id
  • Register set (correct)
  • Private data storage area
  • Kernel stack

    • In Linux, what system call is used for thread creation?

    <p>clone()</p> Signup and view all the answers

    What Linux feature allows a child task to share the address space of the parent task?

    <p>Flags in clone()</p> Signup and view all the answers

    What term does Linux use to refer to threads?

    <p>Tasks</p> Signup and view all the answers

    What is the purpose of a signal handler in an operating system?

    <p>To deliver signals to processes</p> Signup and view all the answers

    In operating systems, what is the role of a user-defined signal handler?

    <p>It can override the default signal handler for a specific signal</p> Signup and view all the answers

    What is the default action when a signal is handled in an operating system?

    <p>Run the default kernel handler for the signal</p> Signup and view all the answers

    For multi-threaded processes, where should a signal be delivered?

    <p>Deliver the signal to the thread to which it applies</p> Signup and view all the answers

    What is the purpose of thread cancellation in an operating system?

    <p>To terminate a thread before it completes its task</p> Signup and view all the answers

    In the context of scheduler activations, what is the role of a lightweight process (LWP)?

    <p>It is a virtual processor on which a process can schedule user threads to run</p> Signup and view all the answers

    What is the main role of a Short-term scheduler (CPU scheduler) in an operating system?

    <p>Selects which process should be executed next and allocates CPU</p> Signup and view all the answers

    Which process state signifies that a process is waiting for some event to occur?

    <p>Waiting</p> Signup and view all the answers

    What type of process spends more time doing I/O operations than computations?

    <p>I/O-bound process</p> Signup and view all the answers

    What information is NOT typically found in the Process Control Block (PCB)?

    <p>Type of scheduler being used</p> Signup and view all the answers

    What is the primary purpose of the context switch in an operating system?

    <p>To save the state of the old process and load the state for the new process</p> Signup and view all the answers

    Which scheduler controls the degree of multiprogramming in an operating system?

    <p>Long-term scheduler</p> Signup and view all the answers

    What is the main function of the Long-term scheduler (job scheduler) in an operating system?

    <p>Controls the degree of multiprogramming</p> Signup and view all the answers

    Which queue in an operating system contains all processes residing in main memory, ready and waiting to execute?

    <p>Ready queue</p> Signup and view all the answers

    In an operating system, what does the running state indicate about a process?

    <p>Instructions are being executed.</p> Signup and view all the answers

    What is a characteristic of CPU-bound processes?

    <p>Few very long CPU bursts.</p> Signup and view all the answers

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