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std::mutex

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< cpp‎ | thread

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C++
 
Tema Biblioteca de ayuda
Threads
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Threads
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(C++11)
this_thread espacio de nombres
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this_thread namespace
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(C++11)
(C++11)
(C++11)
(C++11)
Exclusión mutua
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Mutual exclusion
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mutex
(C++11)
(C++11)
Gestión de bloqueos genérico
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Generic lock management
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(C++11)
(C++11)
(C++11)(C++11)(C++11)
(C++11)
(C++11)
(C++11)(C++11)(C++11)
Las variables de condición
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Condition variables
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(C++11)
(C++11)
(C++11)
(C++11)
Futuros
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Futures
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(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
 
std::mutex
Las funciones miembro
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Member functions
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Bloqueo
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Locking
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Identificador nativo
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Native handle
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Definido en la cabecera <mutex>
class mutex;
 (desde C++11)
La clase mutex es una primitiva de sincronización que se puede utilizar para proteger los datos compartidos de ser simultáneamente acceso a varios subprocesos .
Original:
The mutex class is a synchronization primitive that can be used to protect shared data from being simultaneously accessed by multiple threads.
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mutex ofrece exclusivos y no-recurrentes semántica de propiedad:
Original:
mutex offers exclusive, non-recursive ownership semantics:
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  • Un subproceso de la llamada' posee una mutex desde el momento en que se llama correctamente a cualquier lock try_lock o hasta que se llama a unlock .
    Original:
    A calling thread owns a mutex from the time that it successfully calls either lock or try_lock until it calls unlock.
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  • Cuando un hilo posee una mutex, todos los otros hilos se bloqueará (para las llamadas a lock) o recibir un valor de retorno false (por try_lock) si intentan reclamar la propiedad de la mutex .
    Original:
    When a thread owns a mutex, all other threads will block (for calls to lock) or receive a false return value (for try_lock) if they attempt to claim ownership of the mutex.
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  • Un subproceso de llamada no debe ser propietario de una mutex antes de llamar a lock o try_lock .
    Original:
    A calling thread must not own a mutex prior to calling lock or try_lock.
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El comportamiento de un programa es indefinido si un mutex se destruye mientras sigue en manos de un hilo. La clase mutex no es copiable .
Original:
The behavior of a program is undefined if a mutex is destroyed while still owned by some thread. The mutex class is non-copyable.
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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 mutex
Original:
constructs the mutex
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(función miembro público) [editar]
Bloqueo
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Locking
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bloquea el mutex, si bloquea el mutex no está disponible
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locks the mutex, blocks if the mutex is not available
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(función miembro público) [editar]
intenta bloquear el mutex, devuelve si la exclusión mutua no se encuentra disponible
Original:
tries to lock the mutex, returns if the mutex is not available
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(función miembro público) [editar]
desbloquea el mutex
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unlocks the mutex
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(función miembro público) [editar]
Identificador nativo
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Native handle
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devuelve la implementación subyacente definida por el identificador de subproceso
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returns the underlying implementation-defined thread handle
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(función miembro público) [editar]

[editar] Ejemplo

Este ejemplo muestra cómo una mutex se puede utilizar para proteger una std::map compartida entre dos hilos .
Original:
This example shows how a mutex can be used to protect a std::map shared between two threads.
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#include <iostream>
#include <chrono>
#include <thread>
#include <mutex>
#include <map>
#include <string>
 
std::map<std::string, std::string> g_pages;
std::mutex g_pages_mutex;
 
void save_page(const std::string &url)
{
    // simulate a long page fetch
    std::this_thread::sleep_for(std::chrono::seconds(2));
    std::string result = "fake content";
 
    g_pages_mutex.lock();
    g_pages[url] = result;
    g_pages_mutex.unlock();
}
 
int main() 
{
    std::thread t1(save_page, "http://foo");
    std::thread t2(save_page, "http://bar");
    t1.join();
    t2.join();
 
    g_pages_mutex.lock();
    for (const auto &pair : g_pages) {
        std::cout << pair.first << " => " << pair.second << '\n';
    }
    g_pages_mutex.unlock();
}

Salida: 

http://bar => fake content
http://foo => fake content
Obtenido de «https://es.cppreference.com/mwiki/index.php?title=cpp/thread/mutex&oldid=32036»
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