5 Essential Elements For sleep
The behavior of the plan is undefined if a mutex is ruined although continue to owned by any threads, or simply a thread terminates whilst proudly owning a mutex. The mutex class satisfies all demands of Mutex and StandardLayoutType.
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The sleep could resume previously if a signal that is not overlooked is obtained. In these types of situation, if remaining is not NULL, the remaining time length is stored into the article pointed to by remaining.
remaining - pointer to the object To place the remaining time on interruption. Could possibly be NULL, during which case it truly is ignored
Supplies a touch towards the implementation to reschedule the execution of threads, making it possible for other threads to run.
The mutex course is often a synchronization primitive that can be utilized to guard shared knowledge from staying at the same time accessed by multiple threads.
The actual sleep time could be longer than requested since it is rounded up on the timer granularity and since of scheduling and context switching overhead.
Even though notified below lock, overload (1) tends to make no guarantees concerning the state of the associated predicate when returning due to timeout.
In almost any situation, the perform also may look ahead to for a longer period than until eventually soon after abs_time is reached due to scheduling or useful resource competition delays.
Latches and barriers are thread coordination mechanisms that make it possible for any range of threads to dam till an envisioned variety of threads arrive. A latch can't be reused, whilst a barrier can be employed continuously. Defined in header
If the longer term is the results of a phone to std::async that employed lazy evaluation, this functionality returns promptly with no waiting around.
The purpose template std::async runs the functionality file asynchronously (possibly inside of a independent thread which might be described as a Portion of a thread pool) and returns a std::future that could ultimately keep the result of that functionality phone. 1) Behaves like (2) is termed with policy staying std::launch::async
Blocks the execution of the present thread for at least right until the TIME_UTC based mostly period pointed to How to get better sleep by length has elapsed.
Threads start off execution instantly on design in the affiliated thread object (pending any OS scheduling delays), commencing at the highest-level operate delivered as being a constructor argument. The return worth of the best-level perform is overlooked and when it terminates by throwing an exception, std::terminate is called.
std::condition_variable is often a synchronization primitive applied that has a std::mutex to dam one or more threads until finally Yet another thread the two modifies a shared variable (the situation) and notifies the std::condition_variable.