std::thread, mutex, lock_guard, condition_variable, atomics, memory orderings, futures and async.
36 cards · basic cards · AI-written, checked twice. Edit anything.
- What does std::thread represent?
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A single thread of execution that can run concurrently with other threads.- How do you create and start a std::thread?
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Pass a callable (function, lambda, or functor) to the std::thread constructor; the thread starts immediately.- What does thread.join() do?
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Blocks the calling thread until the target thread finishes execution.- What does thread.detach() do?
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Separates the thread object from the underlying thread, allowing it to continue running independently.- Can you copy a std::thread object?
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No, std::thread objects are not copyable; they have a deleted copy constructor and assignment operator.- What is a race condition?
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When behavior depends on the relative timing of multiple threads accessing shared data without synchronization.- What is a mutex?
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A mutual exclusion lock that ensures only one thread can access a protected resource at a time.- What does std::lock_guard do?
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Automatically acquires a mutex upon construction and releases it upon destruction following RAII.- How does std::unique_lock differ from std::lock_guard?
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unique_lock allows manual lock and unlock, move semantics, and deferred locking, while lock_guard is simpler and always holds until destruction.- What is std::shared_lock used for?
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It allows multiple readers to hold the lock simultaneously while writers get exclusive access in read-write scenarios.- What is a std::condition_variable?
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A synchronization primitive that allows threads to wait until a specific condition is signaled by another thread.- What does condition_variable::wait() do?
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Releases the held mutex, blocks the thread, and reacquires the mutex upon being notified.- What is the difference between notify_one() and notify_all()?
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notify_one() wakes one waiting thread, while notify_all() wakes all waiting threads.- What is std::atomic?
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A template class providing atomic, indivisible access to a shared variable without explicit locks.- What are the main advantages of atomics over mutexes?
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Lower overhead, lock-free operation potential, no deadlock risk, and better performance for simple shared variables.
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