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std::condition_variable_any::wait_until

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Thema Support-Bibliothek
Threads
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Threads
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thread(C++11)
this_thread Namespace
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this_thread namespace
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get_id(C++11)
yield(C++11)
sleep_for(C++11)
sleep_until(C++11)
Gegenseitigen Ausschluss
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Generische Sperrverwaltung
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Generic lock management
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lock_guard(C++11)
unique_lock(C++11)
defer_lock_t
try_to_lock_t
adopt_lock_t
(C++11)
(C++11)
(C++11)
lock(C++11)
try_lock(C++11)
defer_lock
try_to_lock
adopt_lock
(C++11)
(C++11)
(C++11)
Zustand Variablen
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Condition variables
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condition_variable(C++11)
condition_variable_any(C++11)
notify_all_at_thread_exit(C++11)
cv_status(C++11)
Futures
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Futures
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promise(C++11)
future(C++11)
shared_future(C++11)
packaged_task(C++11)
async(C++11)
launch(C++11)
future_status(C++11)
future_error(C++11)
future_category(C++11)
future_errc(C++11)
 
std::condition_variable_any
Member-Funktionen
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Member functions
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condition_variable_any::condition_variable_any
condition_variable_any::~condition_variable_any
Notification
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Notification
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condition_variable_any::notify_one
condition_variable_any::notify_all
Warten
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Waiting
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condition_variable_any::wait
condition_variable_any::wait_for
condition_variable_any::wait_until
Ureinwohner Griff
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Native handle
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condition_variable_any::native handle
 
template< class Lock, class Clock, class Duration >

std::cv_status wait_until( Lock& lock,

                           const std::chrono::time_point<Clock, Duration>& abs_time);
(1) (seit C++11)
template< class Lock, class Clock, class Duration, class Predicate >

bool wait_until( Lock& lock,
                 const std::chrono::time_point<Clock, Duration>& abs_time,

                 Predicate pred);
(2) (seit C++11)
wait_until bewirkt, dass der aktuelle Thread zu blockieren, bis die Bedingung variable mitgeteilt wird, eine bestimmte Zeit erreicht ist, oder eine falsche wakeup auftritt, wahlweise Schleife, bis einige Prädikat erfüllt ist .
Original:
wait_until causes the current thread to block until the condition variable is notified, a specific time is reached, or a spurious wakeup occurs, optionally looping until some predicate is satisfied.
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1)
Atomar freigibt lock, blockiert den aktuellen ausgeführten Threads, und fügt sie in die Liste der wartenden Threads auf *this. Der Faden wird entsperrt, wenn notify_all() oder notify_one() ausgeführt werden, oder wenn der absolute Zeitpunkt abs_time erreicht ist. Es kann auch fälschlicherweise entsperrt werden. Wenn freigegeben, egal aus welchem ​​Grund, ist lock reacquired und wait_until beendet. Wenn diese Funktion tritt über Ausnahme ist lock auch zurückerworben .
Original:
Atomically releases lock, blocks the current executing thread, and adds it to the list of threads waiting on *this. The thread will be unblocked when notify_all() or notify_one() is executed, or when the absolute time point abs_time is reached. It may also be unblocked spuriously. When unblocked, regardless of the reason, lock is reacquired and wait_until exits. If this function exits via exception, lock is also reacquired.
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2)
Entspricht
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Equivalent to
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while (!pred())
    if (wait_until(lock, abs_time) == std::cv_status::timeout)
        return pred();
return true;

Diese Überlastung kann verwendet werden, um störende wakeups ignorieren .
Original:
This overload may be used to ignore spurious wakeups.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

lock -
ein Objekt des Typs Lock, die die Anforderungen BasicLockable, die durch den aktuellen Thread gesperrt werden müssen erfüllt
Original:
an object of type Lock that meets the requirements of BasicLockable, which must be locked by the current thread
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abs_time -
ein Objekt vom Typ std::chrono::time_point repräsentiert die Zeit, wann man aufhören warten
Original:
an object of type std::chrono::time_point representing the time when to stop waiting
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pred - predicate which returns ​false
wenn das Warten sollte fortgesetzt werden
Original:
if the waiting should be continued
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.

The signature of the predicate function should be equivalent to the following:

 bool pred();

[Bearbeiten] Rückgabewert

1)
std::cv_status::timeout wenn die absolute Timeout durch abs_time angegeben wurde erreicht, std::cv_status::no_timeout overwise .
Original:
std::cv_status::timeout if the absolute timeout specified by abs_time was reached, std::cv_status::no_timeout overwise.
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2)
false wenn das Prädikat pred noch ausgewertet false nach dem abs_time Timeout abgelaufen, sonst true .
Original:
false if the predicate pred still evaluates to false after the abs_time timeout expired, otherwise true.
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[Bearbeiten] Ausnahmen

Kann std::system_error werfen, kann auch propagieren Ausnahmen lock.lock() geworfen oder lock.unlock() .
Original:
May throw std::system_error, may also propagate exceptions thrown by lock.lock() or lock.unlock().
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[Bearbeiten] Notes

Der Aufruf dieser Funktion, wenn lock.mutex() nicht durch den aktuellen Thread gesperrt ist undefiniert .
Original:
Calling this function if lock.mutex() is not locked by the current thread is undefined behavior.
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Der Aufruf dieser Funktion, wenn lock.mutex() nicht das gleiche Mutex als ein von allen anderen Threads, wartet derzeit auf der gleichen Bedingung variabel ist undefiniert verwendet .
Original:
Calling this function if lock.mutex() is not the same mutex as the one used by all other threads that are currently waiting on the same condition variable is undefined behavior.
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[Bearbeiten] Beispiel

#include <iostream>
#include <atomic>
#include <condition_variable>
#include <thread>
#include <chrono>
 
std::condition_variable_any cv;
std::mutex cv_m;
std::atomic<int> i = ATOMIC_VAR_INIT(0);
 
void waits(int idx)
{
    std::unique_lock<std::mutex> lk(cv_m);
    auto now = std::chrono::system_clock::now();
    if(cv.wait_until(lk, now + std::chrono::milliseconds(idx*100), [](){return i == 1;}))
        std::cerr << "Thread " << idx << " finished waiting. i == " << i << '\n';
    else
        std::cerr << "Thread " << idx << " timed out. i == " << i << '\n';
}
 
void signals()
{
    std::this_thread::sleep_for(std::chrono::milliseconds(120));
    std::cerr << "Notifying...\n";
    cv.notify_all();
    std::this_thread::sleep_for(std::chrono::milliseconds(100));
    i = 1;
    std::cerr << "Notifying again...\n";
    cv.notify_all();
}
 
int main()
{
    std::thread t1(waits, 1), t2(waits, 2), t3(waits, 3), t4(signals);
    t1.join(); 
    t2.join();
    t3.join();
    t4.join();
}

Possible output:

Thread 1 timed out. i == 0
Notifying...
Thread 2 timed out. i == 0
Notifying again...
Thread 3 finished waiting. i == 1

[Bearbeiten] Siehe auch

Blockiert den aktuellen Thread, bis die Bedingung variable wird aufgeweckt
Original:
blocks the current thread until the condition variable is woken up
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(öffentliche Elementfunktion) [edit]
blockiert den aktuellen Thread, bis die Bedingung Variable wird nach oben oder aufgewacht nach der angegebenen Zeitsperre Dauer
Original:
blocks the current thread until the condition variable is woken up or after the specified timeout duration
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(öffentliche Elementfunktion) [edit]