C++ Multithreading Partial Sums Code Analysis

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Questions and Answers

What is the purpose of the 'IntegrCalc' class mentioned in the code snippet?

  • To demonstrate the concept of mutex locks in concurrent programming
  • To implement a producer-consumer pattern in a multi-threaded environment
  • To synchronize access to shared resources using semaphores
  • To calculate the integral of a function using multiple threads (correct)

What does the 'func' function in the code snippet calculate?

  • Inverse tangent function
  • Natural logarithm function
  • Absolute value of the sine function (correct)
  • Absolute value of the cosine function

Which of the following is NOT a member variable of the 'IntegrCalc' class?

  • divisions (correct)
  • resLock
  • numProducts
  • ID

What is the purpose of 'slotsAvail' and 'resAvail' semaphores in the 'IntegrCalc' class?

<p>Controlling access to shared buffer slots (B)</p> Signup and view all the answers

In the 'Slice' struct, what does the 'divisions' member represent?

<p>The number of divisions in an integration interval (A)</p> Signup and view all the answers

Which mutex in the 'IntegrCalc' class is responsible for ensuring exclusive access to the 'buffer'?

<p>l2 (A)</p> Signup and view all the answers

'numProducts' semaphore in the 'IntegrCalc' class is used for what purpose?

<p>Ensuring only a fixed number of threads can access shared resources (D)</p> Signup and view all the answers

'result' pointer in the 'IntegrCalc' class is most likely used for what purpose?

<p>Referencing the final results of function integration (D)</p> Signup and view all the answers

'initClass' method in the 'IntegrCalc' class is primarily responsible for what action?

<p>Initializing thread-specific variables and data structures (A)</p> Signup and view all the answers

What is the main purpose of using semaphores in the producers–consumers problem?

<p>Ensuring exclusive access to the shared buffer (A)</p> Signup and view all the answers

Why should binary semaphores be avoided in the context of multiple producers and consumers?

<p>They cannot accumulate multiple signals/increments (B)</p> Signup and view all the answers

In the context of thread synchronization, what is a common issue associated with not properly using mutexes?

<p>Race conditions in critical sections (A)</p> Signup and view all the answers

How do counting semaphores contribute to solving the producers–consumers problem?

<p>Allowing a specified number of threads to access the buffer (D)</p> Signup and view all the answers

What characteristic of binary semaphores makes them less suitable for scenarios with multiple signals/increments?

<p>Inability to accumulate signals (B)</p> Signup and view all the answers

Why is it important to utilize semaphores in a synchronized system like the producers-consumers setup?

<p>To manage access to shared resources (A)</p> Signup and view all the answers

In the given code snippet, what does the 'slotsAvail' semaphore represent?

<p>Number of empty buffer slots available (A)</p> Signup and view all the answers

Which action does the 'resAvail' semaphore trigger in the 'Producer' class?

<p>Indicate availability of resources (B)</p> Signup and view all the answers

What is the purpose of the 'l1' and 'l2' semaphores in the code snippet?

<p>Ensure mutual exclusion for buffer operations (B)</p> Signup and view all the answers

Which operation is performed by the 'resAvail.acquire()' call in the 'Consumer' class?

<p>Acquire an empty buffer slot (C)</p> Signup and view all the answers

Considering the code snippet, what is the purpose of the 'in' and 'out' indices in the buffer?

<p>Update buffer indices safely (A)</p> Signup and view all the answers

'resCount' is mentioned but not protected by a mutex. What is a potential issue with this approach?

<p>'resCount' may become corrupted by concurrent access (A)</p> Signup and view all the answers

What is a common issue that can arise when using a semaphore for read-only access?

<p>Resource leakage (D)</p> Signup and view all the answers

Which type of semaphore is most suitable when a semaphore is used as a lock?

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

What limitation should be considered when using C++20's counting_semaphore over a general semaphore?

<p>Cannot adjust value by more than 1 (A)</p> Signup and view all the answers

What is the primary role of a semaphore when used as a resource counter?

<p>Counting available resources (C)</p> Signup and view all the answers

In the context of semaphores, what problem can occur if read-only access is not properly managed?

<p>Resource leakage (B)</p> Signup and view all the answers

When implementing a semaphore as a lock, what would be a significant concern to address?

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

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