The Basic Principles Of sleep

The Basic Principles Of sleep

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No synchronization is done on *this alone. Concurrently calling be part of() on the same thread object from a number of threads constitutes a knowledge race that ends in undefined actions.

Provides a touch to the implementation to reschedule the execution of threads, enabling other threads to operate.

If policy is std::start::async

The top-stage perform may well talk its return price or an exception towards the caller by means of std::guarantee or by modifying shared variables (which can call for synchronization, see std::mutex and std::atomic).

Even though the shared variable is atomic, it must be modified while possessing the mutex to properly publish the modification to the waiting thread.

Waits for The end result to become readily available. Blocks until finally specified timeout_duration has elapsed or The end result results in being available, whichever arrives to start with. The return worth identifies the state of The end result.

Whether or not the clock in use is std::chrono::steady_clock or A different monotonic clock, a process clock adjustment may perhaps induce a spurious wakeup.

A clock contains a starting point (or epoch) and a tick fee. As an example, a clock could possibly have an epoch of January Stages of sleep 1, 1970 and tick every next. C++ defines quite a few clock varieties: Defined in header Outlined in namespace std::chrono

The perform also may possibly block till soon after sleep_time has long been attained on account of system scheduling or resource competition delays.

This operate may possibly block for extended than sleep_duration as a consequence of scheduling or useful resource rivalry delays.

Observe the destructors of std::futures received by signifies aside from a phone to std::async never ever block. [edit] Instance

atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit

A calling thread owns a mutex through the time that it successfully calls possibly lock or try_lock till it phone calls unlock.

This permits the perform to check if halt has been requested for the duration of its execution, and return if it's got.

The result or exception is positioned while in the shared condition connected to the returned std::long run and only then it is actually built Completely ready. All further more accesses to the same std::future will return the result immediately.