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std::mutex

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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::mutex
Funções de membro
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Member functions
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mutex::mutex
Bloqueio
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Locking
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mutex::lock
mutex::try_lock
mutex::unlock
Identificador nativo
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Native handle
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mutex::native_handle
 
Defined in header <mutex>
class mutex;
(a partir do C++ 11)
A classe mutex é um primitivo de sincronização que pode ser usado para proteger os dados compartilhados de ser acessado simultaneamente por vários segmentos.
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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 ofertas exclusivas, semântica não-recursivas propriedade:
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mutex offers exclusive, non-recursive ownership semantics:
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  • Um segmento chamado' possui um mutex a partir do momento que ele chama de sucesso ou lock ou try_lock até que ele chama unlock.
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    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 um segmento possui um mutex, todos os outros segmentos irá bloquear (para chamadas para lock) ou receber um valor de retorno false (para try_lock) se tentarem reivindicar a posse do 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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  • A thread de chamada não deve possuir um mutex antes de chamar lock ou try_lock.
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    A calling thread must not own a mutex prior to calling lock or try_lock.
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O comportamento de um programa é indefinido se um mutex é destruído enquanto ainda pertence por alguma thread. A classe mutex não é copiável.
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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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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 mutex
Original:
constructs the mutex
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(função pública membro) [edit]
Bloqueio
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Locking
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bloqueia o mutex, blocos se o mutex não está disponível
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locks the mutex, blocks if the mutex is not available
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(função pública membro) [edit]
tenta bloquear o mutex, retorna se o mutex não está disponível
Original:
tries to lock the mutex, returns if the mutex is not available
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(função pública membro) [edit]
destrave o mutex
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unlocks the mutex
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(função pública membro) [edit]
Identificador nativo
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Native handle
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retorna o identificador segmento subjacente definida pela implementação
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returns the underlying implementation-defined thread handle
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(função pública membro) [edit]

[editar] Exemplo

Este exemplo mostra como um mutex pode ser usado para proteger uma std::map compartilhada entre dois segmentos .
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