C++ 20 (2a) New Features - Atomic Smart Pointers

The video tutorial discusses atomic smart pointers in C++, focusing on their behavior in multithreading environments. It explains the use of J threads and shared pointers, highlighting the atomic nature of control blocks but not the pointer values. The video identifies issues with shared pointers in concurrent threads and proposes a solution using atomic shared pointers, although current compilers do not support this yet. The tutorial concludes with a preview of the next topic on efficient atomic waiting.

What is the purpose of using the fsanitize thread argument in the code example?

• To ensure compatibility with older compilers

• To optimize the code for performance

• To verify if synchronization is correct

• To check for memory leaks

What is a J thread in C20?

• A thread that requires manual joining

• A thread that is deprecated in C20

• A thread that runs indefinitely

• A thread that automatically joins at its destructor

Why is access to the pointer value in a shared pointer not considered atomic?

• Because the control block is not atomic

• Because it requires manual synchronization

• Because it is not supported in C20

• Because the pointer value can be modified concurrently

What does the thread sanitizer warning indicate in the code example?

• An outdated compiler version

• A syntax error in the code

• A data race in the shared pointer assignment

• A successful compilation with no issues

What is the proposed solution to make shared pointers truly atomic?

• Avoiding the use of shared pointers altogether

• Implementing partial specialization for shared pointers

• Using a different programming language

• Relying on manual synchronization techniques