The returned value of overload (3) signifies whether or not pred evaluated to true, irrespective of whether there was a halt asked for or not.

atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit

If coverage is std::launch::async

These parts are supplied for great-grained atomic operations allowing for lockless concurrent programming. Every single atomic operation is indivisible with regards to almost every other atomic operation that will involve the identical item. Atomic objects are cost-free of data races.

Mutual exclusion algorithms reduce numerous threads from concurrently accessing shared means. This prevents info races and provides help for synchronization involving threads. Defined in header

Waits for the result to become readily available. Blocks until specified timeout_duration has elapsed or the result turns into readily available, whichever will come first. The return worth identifies the condition of The end result.

blocks the current thread until finally the issue variable is awakened or right up until specified time place has long been arrived at (public member function) [edit] Native deal with

Regular Rationalization future_status::deferred The shared state consists of a deferred function utilizing lazy evaluation, so the result will be computed only when explicitly requested future_status::ready The result is prepared future_status::timeout The timeout has expired [edit] Exceptions

This overload can be utilised to ignore spurious awakenings whilst waiting for a selected issue to become correct.

This perform may perhaps block for How sleep cycle works extended than timeout_duration as a result of scheduling or resource competition delays.

duration and remaining might place at exactly the same item, which simplifies re-operating the functionality after a sign.

std::launch::deferred.

atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit

Threads start execution quickly on construction from the linked thread item (pending any OS scheduling delays), starting at the very best-stage functionality supplied like a constructor argument. The return price of the best-level operate is overlooked and when it terminates by throwing an exception, std::terminate is called.

In the event the operate file returns a value or throws an exception, it is stored in the shared state accessible through the std::long term that std::async returns towards the caller. [edit] Deferred invocation