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std::condition_variable

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Biblioteca de suporte a discussão
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)
Exclusão mútua
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Gestão de bloqueio genérico
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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)
Variáveis ​​de condição
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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)
Futuros
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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
Funções de membro
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Member functions
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condition_variable::condition_variable
condition_variable::~condition_variable
Notificação
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Notification
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condition_variable::notify_one
condition_variable::notify_all
Espera
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Waiting
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condition_variable::wait
condition_variable::wait_for
condition_variable::wait_until
Identificador nativo
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Native handle
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condition_variable::native handle
 
Defined in header <condition_variable>
class condition_variable;
(a partir do C++ 11)
A classe condition_variable é um primitivo de sincronização que pode ser utilizado para bloquear um segmento, ou vários segmentos, ao mesmo tempo, até que:
Original:
The condition_variable class is a synchronization primitive that can be used to block a thread, or multiple threads at the same time, until:
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  • uma notificação for recebida de outro segmento
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    a notification is received from another thread
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  • um tempo limite expirar, ou
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    a timeout expires, or
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  • um wakeup espúria ocorre
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Qualquer segmento que pretende esperar std::condition_variable tem de adquirir uma std::unique_lock primeiro. As operações de espera atomicamente liberar o mutex e suspender a execução da rosca. Quando a variável de condição é notificado, o fio é despertada, e o mutex é readquirida.
Original:
Any thread that intends to wait on std::condition_variable has to acquire a std::unique_lock first. The wait operations atomically release the mutex and suspend the execution of the thread. When the condition variable is notified, the thread is awakened, and the mutex is reacquired.
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O std::condition_variable classe é um StandardLayoutType. Não é CopyConstructible, MoveConstructible, CopyAssignable, MoveAssignable.
Original:
The class std::condition_variable is a StandardLayoutType. It is not CopyConstructible, MoveConstructible, CopyAssignable, MoveAssignable.
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Índice

[editar] Tipos de membro

Tipo de membro
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Member type
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Definition
native_handle_type
Definida pela implementação
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implementation-defined
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[editar] Funções de membro

Constrói o objeto
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constructs the object
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(função pública membro) [edit]
destrói o objeto
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destructs the object
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(função pública membro) [edit]
operator=
[excluída]
cópia não-transmissíveis
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not copy-assignable
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(função pública membro) [edit]
Notificação
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Notification
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notifica um segmento de espera
Original:
notifies one waiting thread
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(função pública membro) [edit]
notifica todos os segmentos de espera
Original:
notifies all waiting threads
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(função pública membro) [edit]
Espera
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Waiting
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bloqueia o segmento atual até que a variável de condição é acordado
Original:
blocks the current thread until the condition variable is woken up
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(função pública membro) [edit]
Bloqueia o segmento atual até que a variável de condição é acordado ou após o período de tempo limite especificado
Original:
blocks the current thread until the condition variable is woken up or after the specified timeout duration
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(função pública membro) [edit]
bloqueia o segmento atual até que a variável de condição é acordado ou até ponto de tempo especificado foi alcançado
Original:
blocks the current thread until the condition variable is woken up or until specified time point has been reached
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(função pública membro) [edit]
Identificador nativo
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Native handle
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retorna o identificador nativo
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returns the native handle
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(função pública membro) [edit]

[editar] Exemplo

#include <condition_variable>
#include <mutex>
#include <thread>
#include <iostream>
#include <queue>
#include <chrono>
 
int main()
{
    std::queue<int> produced_nums;
    std::mutex m;
    std::condition_variable cond_var;
    bool done = false;
    bool notified = false;
 
    std::thread producer([&]() {
        for (int i = 0; i < 5; ++i) {
            std::this_thread::sleep_for(std::chrono::seconds(1));
            std::unique_lock<std::mutex> lock(m);
            std::cout << "producing " << i << '\n';
            produced_nums.push(i);
            notified = true;
            cond_var.notify_one();
        }   
 
        done = true;
        cond_var.notify_one();
    }); 
 
    std::thread consumer([&]() {
        std::unique_lock<std::mutex> lock(m);
        while (!done) {
            while (!notified) {  // loop to avoid spurious wakeups
                cond_var.wait(lock);
            }   
            while (!produced_nums.empty()) {
                std::cout << "consuming " << produced_nums.front() << '\n';
                produced_nums.pop();
            }   
            notified = false;
        }   
    }); 
 
    producer.join();
    consumer.join();
}

Possible output:

producing 0
consuming 0
producing 1
consuming 1
producing 2
consuming 2
producing 3
consuming 3
producing 4
consuming 4