An Unbiased View of sleep
An Unbiased View of sleep
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No synchronization is done on *this by itself. Concurrently calling be part of() on the exact same thread item from several threads constitutes a data race that leads to undefined behavior.
A situation variable is usually a synchronization primitive that enables several threads to communicate with one another.
std::start::deferred or has more bits set, it'll tumble back again to deferred invocation or even the implementation-described insurance policies In such cases.
These parts are supplied for high-quality-grained atomic operations allowing for for lockless concurrent programming. Every single atomic operation is indivisible with regards to almost every other atomic operation that consists of the identical item. Atomic objects are free of charge of knowledge races.
Whether or not the shared variable is atomic, it has to be modified when proudly owning the mutex to correctly publish the modification for the waiting thread.
Waits for the result to be 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.
The typical endorses which the clock tied to abs_time be utilized to evaluate time; that clock is just not needed to be described as a monotonic clock. There isn't any assures regarding the conduct of this perform In the event the clock is modified 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 adjustments for the program clock, but not for the consumer-offered Clock.
A clock contains a place to begin (or epoch) as well as a tick price. For instance, a clock may have an epoch of January one, 1970 and tick just about every 2nd. C++ defines numerous clock varieties: Defined in header Described in namespace std::chrono
In almost any scenario, the operate also might wait for longer than right until immediately after abs_time has become attained because of scheduling or useful resource rivalry delays.
The implementation may increase the conduct of the very first overload of std::async by enabling supplemental (implementation-outlined) Tips to improve your sleep routine bits within the default start coverage.
No two std::thread objects may possibly stand for the identical thread of execution; std::thread is not really CopyConstructible or CopyAssignable, although it is MoveConstructible and MoveAssignable.
std::launch::deferred.
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
The end result or exception is put in the shared state linked to the returned std::upcoming and only then it is produced Prepared. All even more accesses to the exact same std::upcoming will return The end result immediately.