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std::condition_variable

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C++
 
Tema Biblioteca de ayuda
Threads
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Threads
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thread(C++11)
this_thread espacio de nombres
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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)
Exclusión mutua
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Gestión de bloqueos 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)
Las variables de condición
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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
Las funciones miembro
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Member functions
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condition_variable::condition_variable
condition_variable::~condition_variable
Notificación
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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;
 (desde C++11)
La clase condition_variable es una primitiva de sincronización que se puede utilizar para bloquear un hilo, o hilos de múltiples al mismo tiempo, hasta que:
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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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  • se recibe una notificación de otro hilo
    Original:
    a notification is received from another thread
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  • un tiempo de espera, o
    Original:
    a timeout expires, or
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  • un activación espuria se produce
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    a activación espuria occurs
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Cualquier hilo que tiene la intención de esperar en std::condition_variable tiene que adquirir un std::unique_lock primero. Las operaciones de espera atómicamente liberar la exclusión mutua y la suspensión de la ejecución de la rosca. Cuando la variable de estado se notifica, el hilo se despertó y volvió a adquirir el mutex está .
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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La clase es un std::condition_variable StandardLayoutType. No es CopyConstructible, MoveConstructible, CopyAssignable, MoveAssignable .
Original:
The class std::condition_variable is a StandardLayoutType. It is not CopyConstructible, MoveConstructible, CopyAssignable, MoveAssignable.
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Contenido

[editar] Tipos de miembros

Miembro de tipo
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Member type
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 Definition
native_handle_type
' Definido por la implantación
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implementation-defined
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[editar] Las funciones miembro
Construye el objeto
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constructs the object
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(miembro público función) [edit]
destructs el objeto
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destructs the object
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(miembro público función) [edit]
operator=
[eliminada]
no copia-asignable
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not copy-assignable
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(miembro público función) [edit]
Notificación
Original:
Notification
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notifica un subproceso en espera
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notifies one waiting thread
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(miembro público función) [edit]
notifica a todos los subprocesos en espera
Original:
notifies all waiting threads
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(miembro público función) [edit]
Espera
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Waiting
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Bloquea el subproceso actual hasta que la variable condición es despertado
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blocks the current thread until the condition variable is woken up
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(miembro público función) [edit]
Bloquea el subproceso actual hasta que la variable condición es despertado o después del tiempo de espera especificado
Original:
blocks the current thread until the condition variable is woken up or after the specified timeout duration
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(miembro público función) [edit]
Bloquea el subproceso actual hasta que la variable condición es despertado o hasta que punto se especifica el tiempo ha sido alcanzada
Original:
blocks the current thread until the condition variable is woken up or until specified time point has been reached
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(miembro público función) [edit]
Identificador nativo
Original:
Native handle
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devuelve el identificador nativo
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returns the native handle
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(miembro público función) [edit]

[editar] Ejemplo

#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
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/thread/condition_variable&oldid=32045»