A Simple Key For sleep Unveiled
A Simple Key For sleep Unveiled
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No synchronization is carried out on *this itself. Concurrently contacting be part of() on precisely the same thread object from multiple threads constitutes a knowledge race that ends in undefined conduct.
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std::start::deferred or has added bits set, it will eventually slide back again to deferred invocation or the implementation-described procedures In this instance.
The best-level operate may talk its return price or an exception to the caller by way of std::guarantee or by modifying shared variables (which can demand synchronization, see std::mutex and std::atomic).
Even when the shared variable is atomic, it have to be modified though owning the mutex to correctly publish the modification to your waiting thread.
The very best-stage functionality may communicate its return worth or an exception on the caller via std::promise or by modifying shared variables (which may need synchronization, see std::mutex and std::atomic).
The regular recommends that the clock tied to abs_time be accustomed to measure time; that clock just isn't necessary to become a monotonic clock. There won't be any ensures concerning the habits of the operate In case the clock is altered discontinuously, but the present implementations change abs_time from Clock to std::chrono::system_clock and delegate to POSIX pthread_cond_timedwait so the wait around honors changes on the technique clock, although not on the consumer-presented Clock.
Even though notified below lock, overload (1) tends to make no guarantees concerning the state of the associated predicate when returning due to timeout.
atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit
atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit
If the future is the results of a call to std::async that utilised lazy evaluation, this purpose returns instantly devoid of waiting.
atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit
atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit
This permits the function to check if end has actually been asked for throughout its execution, and return if it's.
In case the std::upcoming obtained from std::async isn't moved from or certain to a reference, the destructor with the std::upcoming will block Tips to improve your sleep routine at the end of the total expression until finally the asynchronous Procedure completes, fundamentally earning code like the next synchronous: