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std::condition_variable_any::wait_for

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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 Rep, class Period >

std::cv_status wait_for( Lock& lock,

                         const std::chrono::duration<Rep, Period>& rel_time);
(1) (seit C++11)
template< class Lock, class Rep, class Period, class Predicate >

bool wait_for( Lock& lock,
               const std::chrono::duration<Rep, Period>& rel_time,

               Predicate pred);
(2) (seit C++11)
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 die relative Timeout rel_time abläuft. Es kann auch fälschlicherweise entsperrt werden. Wenn freigegeben, egal aus welchem ​​Grund, ist lock reacquired und wait_for() 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 relative timeout rel_time expires. It may also be unblocked spuriously. When unblocked, regardless of the reason, lock is reacquired and wait_for() 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_for(lock, rel_time) == std::cv_status::timeout)
        return pred();
return true;

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

[Bearbeiten] Parameter

lock -
ein Objekt des Typs, der die Lock BasicLockable Anforderungen, die durch den aktuellen Thread gesperrt werden müssen erfüllt
Original:
an object of type Lock that meets the BasicLockable requirements, which must be locked by the current thread
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rel_time -
ein Objekt vom Typ std::chrono::duration, die die maximale Zeit mit Warten verbringen
Original:
an object of type std::chrono::duration representing the maximum time to spend 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 relative Timeout durch rel_time angegebenen abgelaufen, std::cv_status::no_timeout overwise .
Original:
std::cv_status::timeout if the relative timeout specified by rel_time expired, std::cv_status::no_timeout overwise.
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2)
false wenn das Prädikat pred noch ausgewertet false nach dem rel_time Timeout abgelaufen, sonst true .
Original:
false if the predicate pred still evaluates to false after the rel_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);
    if(cv.wait_for(lk, 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();
}

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 geweckt bis angegebenen Zeitpunkt erreicht wurde
Original:
blocks the current thread until the condition variable is woken up or until specified time point has been reached
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(öffentliche Elementfunktion) [edit]