A Secret Weapon For sleep
A Secret Weapon For sleep
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A affliction variable is really a synchronization primitive which allows numerous threads to talk to each other.
The sleep may perhaps resume earlier if a signal that isn't ignored is received. In these scenario, if remaining isn't NULL, the remaining time length is saved into the article pointed to by remaining.
The typical library offers services to obtain values which might be returned and to catch exceptions which have been thrown by asynchronous duties (i.e. capabilities launched in independent threads). These values are communicated in a shared condition, where the asynchronous activity may well create its return worth or store an exception, and which may be examined, waited for, and usually manipulated by other threads that hold cases of std::future or std::shared_future that reference that shared condition. Described in header
3) Registers *this for your period of this get in touch with, to generally be notified if a cease ask for is made on stoken's linked halt-state; it really is then such as
Waits for the result to become readily available. Blocks until specified timeout_duration has elapsed or the result gets out there, whichever arrives initial. The return worth identifies the condition of the result.
The actual sleep time could be more time than asked for mainly because it is rounded up into the timer granularity and because of scheduling and context switching overhead.
Consistent Rationalization future_status::deferred The shared point out has a deferred purpose working with lazy analysis, so The end result might be computed only when explicitly asked for future_status::All set The end result is ready future_status::timeout The timeout has expired [edit] Exceptions
It permits some amount of threads to attend (potentially that has a timeout) for notification from One more thread they may well commence. A affliction variable is often linked to a mutex. Outlined in header
This perform may perhaps block for more time than sleep_duration due to scheduling or source contention delays.
The category thread signifies a single thread of execution. Threads enable multiple features to execute concurrently.
A semaphore is a light-weight synchronization primitive utilized to constrain concurrent access to a shared resource. When either would suffice, a semaphore could be far more economical than the usual ailment variable. Defined in header
Blocks the execution of the current thread for at least right until the TIME_UTC based period pointed to by period has elapsed.
Threads begin execution straight away on development with the affiliated thread object (pending any OS scheduling delays), starting up at the highest-degree function supplied as being a constructor argument. The return price of the highest-stage purpose is dismissed and if it terminates by throwing an exception, std::terminate is called.
Should the std::long run obtained from std::async will not be moved from or certain to a reference, the Stages of sleep destructor of the std::foreseeable future will block at the end of the complete expression until finally the asynchronous Procedure completes, basically earning code for example the following synchronous: