Operating System: Mutual Exclusion
10 Questions
5 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the purpose of jacketing?

  • To convert a blocking system call into a non-blocking system call (correct)
  • To handle race conditions
  • To spawn new threads
  • To implement mutual exclusion

    • What is a critical section of code?

  • A section of code that can be executed concurrently
  • A section of code that implements mutual exclusion
  • A section of code that requires access to shared resources (correct)
  • A section of code that handles deadlocks

    • What happens when a thread needs to wait for an event?

  • It enters a critical section
  • It spawns another thread
  • It finishes its execution
  • It blocks, saving its user registers, program counter, and stack pointers (correct)

    • What is a deadlock?

    <p>A situation in which two or more processes are unable to proceed because each is waiting for one of the others to do something</p> Signup and view all the answers

    What is the requirement that ensures no other process may be in a critical section that accesses shared resources when one process is in a critical section?

    <p>Mutual Exclusion</p> Signup and view all the answers

    What is a situation in which multiple threads or processes read and write a shared data item and the final result depends on the relative timing of their execution?

    <p>Race Condition</p> Signup and view all the answers

    What is an atomic operation?

    <p>A function or action implemented as a sequence of one or more instructions that appears to be indivisible</p> Signup and view all the answers

    What happens when a thread completes?

    <p>Its register context and stacks are deallocated</p> Signup and view all the answers

    What is a situation in which two or more processes continuously change their states in response to changes in the other process(es) without doing any useful work?

    <p>Live-lock</p> Signup and view all the answers

    What happens when a new process is spawned?

    <p>A thread for that process is also spawned</p> Signup and view all the answers

    Study Notes

    Mutual Exclusion

    • When one process uses a shared resource, other processes that need access to the same resource are excluded from using it simultaneously.
    • Only one process can access a shared resource at a time, and all other processes must wait.

    Critical Section

    • The part of code in a process that accesses and uses a shared resource is called the critical section.
    • Only one process can enter the critical section at a time to avoid undesirable events.

    Process Concepts

    • Process spawning occurs when the OS creates a process at the explicit request of another process.
    • The process that spawns another process is referred to as the parent process, and the spawned process is referred to as the child process.

    Semaphores

    • A semaphore is an abstract data type that functions as a software synchronization tool to implement a solution to the critical section problem.
    • Semaphores can be used to synchronize access to shared resources.

    Producer-Consumer Problem

    • The producer-consumer problem involves two processes: the producer process, which produces data items and inserts them in a buffer, and the consumer process, which removes data items from the buffer and consumes them.

    Multi-Threading

    • Multi-threading refers to the ability of an OS to support multiple, concurrent paths of execution within a single process.
    • A thread is a unit of dispatching, and a process is a unit of resource ownership.

    Context Switch

    • When the OS interrupts an executing process, it carries out a context switch, changing the CPU from one process to another.
    • The time it takes for this changeover is called the context switch time.

    Deadlocks

    • A deadlock is a state of indefinite waiting that processes may reach when competing for system resources or when attempting to communicate.
    • Four conditions are necessary for the existence of a deadlock: mutual exclusion, hold and wait, no preemption, and circular wait.

    Synchronization

    • Synchronization is the coordination of activities of two or more processes that need to carry out certain activities, such as competing for resources in a mutually exclusive manner or cooperating in sequencing or ordering specific events.

    Blocking and Unblocking

    • A thread blocks when it waits for an event, saving its user registers, program counter, and stack pointers.
    • A thread is unblocked when the event for which it was blocked occurs, and it is moved to the Ready queue.

    Atomic Operations

    • An atomic operation is a function or action implemented as a sequence of one or more instructions that appears to be indivisible, and no other process can see an intermediate state or interrupt the operation.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Learn about mutual exclusion in operating systems where a shared resource can only be accessed by one process at a time. Understand critical sections and how they relate to shared resources.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser