About sleep
About sleep
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The returned value of overload (three) suggests no matter if pred evaluated to real, regardless of whether there was a prevent asked for or not.
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std::launch::deferred or has more bits set, it will eventually slide back to deferred invocation or maybe the implementation-outlined policies In such a case.
The highest-level purpose may well communicate its return worth or an exception towards the caller through std::assure or by modifying shared variables (which may demand synchronization, see std::mutex and std::atomic).
three) Registers *this for your period of this simply call, for being notified if a end request is manufactured on stoken's associated stop-condition; it's then equivalent to
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std::future referring towards the shared state created by this call to std::async. [edit] Start procedures
A clock includes a starting point (or epoch) along with a tick price. As an example, a clock could have an epoch of January 1, 1970 and tick each and every 2nd. C++ defines many clock sorts: Described in header Described in namespace std::chrono
In almost any circumstance, the functionality also may well anticipate for a longer time than until finally right after abs_time has become attained as a result of scheduling or source competition Stages of sleep delays.
This perform might block for longer than timeout_duration as a consequence of scheduling or useful resource competition delays.
No two std::thread objects may possibly symbolize the same thread of execution; std::thread is not really CopyConstructible or CopyAssignable, even though it is MoveConstructible and MoveAssignable.
The perform template std::async operates the perform file asynchronously (probably inside of a independent thread which could become a part of a thread pool) and returns a std::long run which will finally hold the results of that perform connect with. 1) Behaves just as if (2) is referred to as with policy staying std::launch::async
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Threads start out execution right away on construction on the involved thread object (pending any OS scheduling delays), starting up at the top-degree purpose provided being a constructor argument. The return worth of the best-stage operate is disregarded and when it terminates by throwing an exception, std::terminate is named.
std::condition_variable is a synchronization primitive utilized using a std::mutex to dam a number of threads right until another thread each modifies a shared variable (the problem) and notifies the std::condition_variable.