5 Simple Techniques For sleep
5 Simple Techniques For sleep
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The returned value of overload (3) indicates whether pred evaluated to true, irrespective of whether there was a halt asked for or not.
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The sleep may possibly resume earlier if a signal that is not overlooked is obtained. In these types of scenario, if remaining will not be NULL, the remaining time length is saved into the thing pointed to by remaining.
The regular library delivers facilities to get values which have been returned and also to capture exceptions which are thrown by asynchronous jobs (i.e. functions introduced in individual threads). These values are communicated inside a shared condition, wherein the asynchronous activity may well create its return price or retail store an exception, and which may be examined, waited for, and usually manipulated by other threads that hold circumstances of std::upcoming or std::shared_future that reference that shared state. Outlined in header
A time issue is really a duration of time which has handed Considering that the epoch of a selected clock. Defined in header Defined in namespace std::chrono
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The regular recommends that the clock tied to abs_time be utilized to evaluate time; that clock will not be needed to certainly be a monotonic clock. There isn't any assures concerning the actions of the functionality if the clock is adjusted discontinuously, but the existing implementations convert abs_time from Clock to std::chrono::system_clock and delegate to POSIX pthread_cond_timedwait so that the wait honors changes to the system clock, but not to the person-provided Clock.
Regardless of whether notified underneath lock, overload (one) can make no ensures in regards to the condition in the connected predicate when returning as a result of timeout.
This overload can be employed to ignore spurious awakenings even though looking forward to a specific affliction to become legitimate.
The implementation may perhaps prolong the behavior of the How sleep cycle works primary overload of std::async by enabling extra (implementation-described) bits inside the default start coverage.
The class thread signifies an individual thread of execution. Threads allow for a number of functions to execute concurrently.
A semaphore is a lightweight synchronization primitive accustomed to constrain concurrent use of a shared useful resource. When possibly would suffice, a semaphore is usually much more effective than a issue variable. Outlined in header
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This enables the operate to check if quit continues to be requested for the duration of its execution, and return if it's.
Should the operate f returns a worth or throws an exception, it really is saved while in the shared state obtainable with the std::upcoming that std::async returns on the caller. [edit] Deferred invocation