Getting My sleep To Work
Getting My sleep To Work
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No synchronization is done on *this itself. Concurrently calling sign up for() on the exact same thread object from numerous threads constitutes a data race that brings about undefined habits.
atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit
std::start::deferred or has further bits set, it will eventually slide back to deferred invocation or maybe the implementation-defined insurance policies In cases like this.
remaining - pointer to the thing To place the remaining time on interruption. Could possibly be NULL, in which scenario it's overlooked
Even if the shared variable is atomic, it should be modified although possessing the mutex to properly publish the modification to your ready thread.
The best-amount function might converse its return price or an exception to your caller by using std::assure or by modifying shared variables (which can involve synchronization, see std::mutex and std::atomic).
Even if the clock in use is std::chrono::steady_clock or An additional monotonic clock, a method clock adjustment could induce a spurious wakeup.
Continual Explanation future_status::deferred The shared state consists of a deferred perform utilizing lazy evaluation, so the result will probably be computed only when explicitly requested future_status::ready The result is ready future_status::timeout The timeout has expired [edit] Exceptions
This overload might be utilised to disregard spurious awakenings while looking ahead to a certain problem to become legitimate.
This perform may perhaps block for extended than sleep_duration as a result of scheduling or useful resource competition delays.
length and remaining might place at the identical item, which simplifies re-working the purpose after a signal.
A semaphore is a lightweight synchronization primitive accustomed to constrain concurrent usage of a shared resource. When possibly would suffice, a semaphore can be a lot more economical than a issue variable. How to get better sleep Described in header
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 your perform f returns a worth or throws an exception, it can be saved during the shared point out obtainable in the std::upcoming that std::async returns into the caller. [edit] Deferred invocation