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std::mutex - cppreference.com

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<tbody> </tbody>

Elemento definito nell'header

<mutex>

class mutex;

 (dal C++11)

La classe mutex è una primitiva di sincronizzazione che può essere utilizzato per proteggere i dati condivisi vengano accedere contemporaneamente più thread.

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 offre esclusivi, non ricorsivi semantica di proprietà:

Original:

mutex offers exclusive, non-recursive ownership semantics:

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  • Un thread chiamante' possiede un mutex dal momento in cui lo chiama con successo sia lock o try_lock fino a quando non chiama 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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  • Quando un thread possiede un mutex, tutti gli altri thread si blocca (per le chiamate verso lock) o ricevere un valore restituito false (per try_lock) se tentano di rivendicare la proprietà del 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 thread chiamante non deve possedere un mutex prima di chiamare lock o try_lock.

    Original:

    A calling thread must not own a mutex prior to calling lock or try_lock.

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Il comportamento di un programma non è definito se un mutex viene distrutto mentre ancora di proprietà di un po 'di filo. La classe mutex non è copiabile.

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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Membri tipi

Membro tipo

Original:

Member type

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 Definition
native_handle_type

Implementazione definita

Original:

implementation-defined

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Membri funzioni

costruisce il mutex

Original:

constructs the mutex

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(metodo pubblico) [modifica]

Bloccaggio

Original:

Locking

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blocca i blocchi mutex, se il mutex non è disponibile

Original:

locks the mutex, blocks if the mutex is not available

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(metodo pubblico) [modifica]

prova a bloccare il mutex, restituisce se il mutex non è disponibile

Original:

tries to lock the mutex, returns if the mutex is not available

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(metodo pubblico) [modifica]

sblocca il mutex

Original:

unlocks the mutex

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Maniglia nativo

Original:

Native handle

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restituisce l'implementazione sottostante definito handle di thread

Original:

returns the underlying implementation-defined thread handle

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(metodo pubblico) [modifica]

Esempio

Questo esempio mostra come un mutex può essere utilizzata per proteggere un std::map condiviso tra due thread .

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();
}

Output: 

http://bar => fake content
http://foo => fake content