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std::condition_variable_any::wait

Da cppreference.com.

 
 
Discussione libreria di supporto
Threads
Original:
Threads
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thread(C++11)
this_thread spazio dei nomi
Original:
this_thread namespace
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get_id(C++11)
yield(C++11)
sleep_for(C++11)
sleep_until(C++11)
Mutua esclusione
Original:
Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Blocco di gestione generico
Original:
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)
Condizioni variabili
Original:
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
Membri funzioni
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Member functions
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condition_variable_any::condition_variable_any
condition_variable_any::~condition_variable_any
Notifica
Original:
Notification
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condition_variable_any::notify_one
condition_variable_any::notify_all
In attesa
Original:
Waiting
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condition_variable_any::wait
condition_variable_any::wait_for
condition_variable_any::wait_until
Maniglia nativo
Original:
Native handle
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condition_variable_any::native handle
 
template< class Lock >
void wait( Lock& lock );
(1) (dal C++11)
template< class Lock, class Predicate >
void wait( Lock& lock, Predicate pred );
(2) (dal C++11)
wait fa sì che il thread corrente per bloccare fino a quando la variabile di condizione viene notificato o un risveglio spuria si verifica, opzionalmente looping fino a qualche predicato è soddisfatto.
Original:
wait causes the current thread to block until the condition variable is notified or a spurious wakeup occurs, optionally looping until some predicate is satisfied.
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1)
Rilascia atomico lock, blocca il thread corrente di esecuzione, e lo aggiunge alla lista di thread in attesa su *this. Il filo sarà sbloccato quando notify_all() o notify_one() viene eseguito. Essa può anche essere sbloccato spurio. Quando sbloccato, indipendentemente dal motivo, lock è riacquisito ed esce wait. Se questa funzione termina via eccezionale, lock anche riacquistata.
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. It may also be unblocked spuriously. When unblocked, regardless of the reason, lock is reacquired and wait exits. If this function exits via exception, lock is also reacquired.
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2)
Equivalente a
Original:
Equivalent to
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while (!pred()) {
  wait(lock);
}

Questo overload può essere utilizzato per ignorare risvegli spuri in attesa di una condizione specifica per diventare vero.
Original:
This overload may be used to ignore spurious awakenings while waiting for a specific condition to become true.
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Indice

[modifica] Parametri

lock -
un oggetto di tipo Lock che soddisfi i requisiti BasicLockable, che devono essere bloccati dal thread corrente
Original:
an object of type Lock that meets the BasicLockable requirements, which must be locked by the current thread
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pred - predicate which returns ​false
se l'attesa deve essere continuato
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();

[modifica] Valore di ritorno

(Nessuno)
Original:
(none)
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[modifica] Eccezioni

Può lanciare std::system_error, può anche propagare eccezioni generate dal lock.lock() o lock.unlock().
Original:
May throw std::system_error, may also propagate exceptions thrown by lock.lock() or lock.unlock().
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[modifica] Note

Chiamare questa funzione se lock.mutex() non è bloccato dal thread corrente è un comportamento indefinito.
Original:
Calling this function if lock.mutex() is not locked by the current thread is undefined behavior.
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Chiamare questa funzione se lock.mutex() non è lo stesso mutex come quello utilizzato da tutti gli altri thread che sono attualmente in attesa sulla variabile stessa condizione è un comportamento indefinito.
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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[modifica] Esempio

[edit]
#include <iostream>
#include <condition_variable>
#include <thread>
#include <chrono>
 
std::condition_variable_any cv;
std::mutex cv_m;
int i = 0;
 
void waits()
{
    std::unique_lock<std::mutex> lk(cv_m);
    std::cerr << "Waiting... \n";
    cv.wait(lk, [](){return i == 1;});
    std::cerr << "...finished waiting. i == 1\n";
}
 
void signals()
{
    std::this_thread::sleep_for(std::chrono::seconds(1));
    std::cerr << "Notifying...\n";
    cv.notify_all();
    std::this_thread::sleep_for(std::chrono::seconds(1));
    i = 1;
    std::cerr << "Notifying again...\n";
    cv.notify_all();
}
 
int main()
{
    std::thread t1(waits), t2(waits), t3(waits), t4(signals);
    t1.join(); 
    t2.join(); 
    t3.join();
    t4.join();
}

Output:

Waiting...
Waiting...
Waiting...
Notifying...
Notifying again...
...finished waiting. i == 1
...finished waiting. i == 1
...finished waiting. i == 1

[modifica] Vedi anche

Blocca il thread corrente fino a quando la variabile di condizione è svegliato o dopo la durata del timeout specificato
Original:
blocks the current thread until the condition variable is woken up or after the specified timeout duration
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(membro pubblico funzione) [edit]
blocca il thread corrente fino a quando la variabile di condizione è svegliato o fino a che punto nel tempo specificato è stato raggiunto
Original:
blocks the current thread until the condition variable is woken up or until specified time point has been reached
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(membro pubblico funzione) [edit]