Concurrency in C++20

Control tokens

• std::stop_source
• std::stop_source::request_stop
• std::condition_variable_any
• std::stop_callback
• std::jthread

Barriers

• std::barrier
• std::barrier<>::arrive_and_wait

Latches

• std::latch
• std::latch::arrive_and_wait

Semaphors

• std::counting_semaphore
• std::binary_semaphore

Updated atomics

• std::atomic_ref
• std::atomic(std::shared_ptr)
• std::atomic(std::weak_ptr)

Coroutines

• No library support currently - write own code
• https://github.com/lewissbaker/cppcoro

References

• Concurrency in C++20 and Beyond - Anthony Williams
• https://github.com/facebookexperimental/libunifex
• http://www.cplusplusconcurrencyinaction.com/