35 Questions
What is a critical section in multithreading?
A section of the code that updates or reads shared memory and should not be executed simultaneously by multiple threads
Why is it important to minimize the use of mutable objects in concurrent programming?
To avoid data races and ensure thread safety
What does a mutex do in multithreading?
Guarantees that multiple threads never execute a critical section simultaneously
Why are immutable data structures preferred in multithreading?
They can be accessed by multiple threads without risking data races
What should be protected by an atomic operation or mutex in multithreading?
Only the code that updates shared memory
What is one of the main concerns when writing concurrent programs in C++?
Avoiding data races
Which concept in concurrent programming helps in preventing multiple threads from accessing shared resources simultaneously?
Mutexes
What can lead to decreased performance in a concurrent program?
Excessive use of locks
What is an important consideration for running threads in parallel efficiently?
Minimizing synchronization points
In the context of concurrent programming, what does shared memory refer to?
Memory that multiple threads can access
What is the main concern when dealing with shared data in a multithreading environment?
Avoiding data races by ensuring no two threads access the same memory simultaneously
What does TLS stand for in the context of multithreading?
Thread Local Storage
In a multithreading environment, what is the consequence of having a data race?
Potential corruption of shared data
Why is it important to ensure no other thread is accessing shared data during mutation?
Prevent data races and maintain data integrity
What happens if two threads access the same memory simultaneously, with one of them mutating the data?
Data race happens, leading to potential issues like corruption
What term is commonly used to describe torn reads and torn writes in multithreading?
Tearing
How many options are typically recommended to avoid data races in multithreading?
Two
What is one main approach suggested to avoid data races in multithreading?
Implementing locks
Why can the scheduler play a crucial role in preventing data races in multithreading?
By ensuring threads execute sequentially on a single core
What could happen if two threads try to write to a shared variable concurrently without proper synchronization?
Data race could occur leading to incorrect results
In the context of concurrent programming, what is the primary reason why a program may benefit from being concurrent?
To improve efficiency by executing tasks in parallel
What is a key characteristic of concurrent programming compared to sequential programming?
It is inherently more complex
How can dividing a big task into subtasks benefit performance on machines with multiple CPU cores?
It allows tasks to run in parallel, leveraging multiple CPU cores
Why is it important for applications with a graphical user interface to avoid blocking the UI?
To prevent the application from becoming unresponsive
What role does shared memory play in concurrent programming?
It allows threads to communicate and synchronize their actions
What is the purpose of using a mutex in multithreading?
To avoid data races on shared variables
Why does the second thread in the text get blocked when reaching the critical section after the first thread has locked the mutex?
Due to contention caused by the first thread holding the mutex
What does it mean if two threads are said to be running in parallel?
They are executing on different CPU cores simultaneously
How does contention negatively affect the scalability of a concurrent program?
It hinders the ability of adding more CPU cores to improve performance
What is the role of locks in multithreading with shared memory?
To ensure that only one thread can access a shared variable at a time
What term is used to describe the situation where two threads are executing simultaneously on a multicore machine?
Concurrent execution
What is a major challenge when writing concurrent programs in C++ that involve shared memory between threads?
Guaranteeing safety while sharing memory
What does each thread have its own of for storing local variables and data necessary for handling function calls?
Stack
What is one advantage of sharing memory between multiple threads for communication purposes?
Enhanced communication speed
What area of multithreading poses a significant challenge in minimizing shared resources between threads?
Thread synchronization
Learn about concurrency issues in multithreading such as data races through an example where two threads are incrementing a shared variable. Understand how these issues can lead to unexpected results in parallel programming.
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