Concurrency and Synchronization Methods

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Questions and Answers

What is the purpose of the 'Send' primitive in message passing?

  • To wait for a message to arrive
  • To receive a message from a source process
  • To generate something to put in the buffer
  • To send a message to a destination process (correct)

Which of the following accurately describes the 'Receive' primitive in message passing?

  • Sends a message to a destination process
  • Receives a message from a source process (correct)
  • Generates an item to put in the buffer
  • Waits for an empty buffer slot to arrive

What is the role of 'producer' in the Producer Consumer problem using message passing?

  • Receives messages from consumer
  • Waits for an empty buffer slot to arrive
  • Sends messages to consumer
  • Generates items to put in the buffer (correct)

In the context of message passing, what does 'consumer' do?

<p>Receives messages from producer (A)</p> Signup and view all the answers

What happens when the 'Receive' primitive is executed in message passing?

<p>A message is received from a source process (D)</p> Signup and view all the answers

What is the purpose of building a message in the context of message passing?

<p>To construct a message to send (B)</p> Signup and view all the answers

What happens if the value of a semaphore is 0?

<p>The process is put to sleep without completing the down operation (A)</p> Signup and view all the answers

Which of the following statements about semaphore operations is correct?

<p>No other process can access the semaphore until a semaphore operation is completed or blocked (A)</p> Signup and view all the answers

What does the 'up' operation do to a semaphore?

<p>Increments the value of the semaphore (D)</p> Signup and view all the answers

What happens if one or more processes were sleeping on a semaphore during an 'up' operation?

<p>A random process is chosen to complete its down operation (A)</p> Signup and view all the answers

What is guaranteed about a process doing an 'up' operation on a semaphore?

<p>It completes without blocking any process (D)</p> Signup and view all the answers

What is the purpose of setting the shared lock variable to 1 before entering the critical section?

<p>To prevent other processes from entering the critical section (C)</p> Signup and view all the answers

In the scenario described, what issue arises due to the context switch when process P0 is setting the lock variable to 1?

<p>Race condition (B)</p> Signup and view all the answers

What problem is addressed by using the 'turn' variable in the strict alteration algorithm?

<p>Priority inversion (A)</p> Signup and view all the answers

What characteristic of busy waiting is highlighted in the given text?

<p>Wasteful CPU usage (C)</p> Signup and view all the answers

In the shared lock variable algorithm, what prevents two processes from simultaneously accessing the critical section?

<p>The 'lock' variable (A)</p> Signup and view all the answers

Why does process P1 wait in a loop in the strict alteration algorithm?

<p>To wait for turn variable to change (C)</p> Signup and view all the answers

What is the primary disadvantage of taking turns when one process is much slower than the other?

<p>Deadlock occurrence (C)</p> Signup and view all the answers

In the TSL (Test and Set Lock) Instruction, what is the purpose of the CMP REGISTER,#0 instruction?

<p>To check if the lock variable is 0 (C)</p> Signup and view all the answers

What action does the process take in the leave_region step of the TSL (Test and Set Lock) Instruction?

<p>Store 0 in lock variable (B)</p> Signup and view all the answers

In the Exchange Instruction Algorithm, what happens after moving REGISTER,#1 in the enter_region step?

<p>Swapping content of REGISTER and LOCK (A)</p> Signup and view all the answers

What is a key difference between the TSL (Test and Set Lock) Instruction and Exchange Instruction Algorithm?

<p>The mechanism for entering the critical region (A)</p> Signup and view all the answers

Why is taking turns not a good idea when one process is much slower than another?

<p>It can cause a race condition (C)</p> Signup and view all the answers

Which synchronization primitive is described as a collection of procedures, variables, and data structures grouped together in a special module or package?

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

In the Producer Consumer problem using Semaphores, what does the 'full' semaphore represent?

<p>Items produced by the producer (B)</p> Signup and view all the answers

What is the purpose of the 'empty' semaphore in the Producer Consumer problem with Semaphores?

<p>To track available slots in the buffer (C)</p> Signup and view all the answers

What role does the 'mutex' semaphore play in the Producer Consumer problem using Semaphores?

<p>Handles mutual exclusion (B)</p> Signup and view all the answers

Why does a process get suspended when calling a procedure within a monitor if another process is already active?

<p>To achieve mutual exclusion (B)</p> Signup and view all the answers

What property of a monitor ensures that only one process can be active within it at any instant?

<p>Mutual exclusion (A)</p> Signup and view all the answers

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