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std::lock_guard

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C++
 
Biblioteca de suporte a discussão
Threads
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Threads
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this_thread namespace
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this_thread namespace
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Exclusão mútua
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Mutual exclusion
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Gestão de bloqueio genérico
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Generic lock management
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lock_guard
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(C++11)(C++11)(C++11)
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Variáveis ​​de condição
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Condition variables
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Futuros
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Futures
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std::lock_guard
Funções de membro
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Member functions
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lock_guard::lock_guard
lock_guard::~lock_guard
 
Definido no cabeçalho <mutex>
template< class Mutex >
class lock_guard;
 (desde C++11)
O lock_guard classe é um invólucro mutex que fornece um mecanismo conveniente para RAII estilo possuir um mutex para a duração de um bloco de escopo.
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The class lock_guard is a mutex wrapper that provides a convenient RAII estilo mechanism for owning a mutex for the duration of a scoped block.
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Quando um objeto é criado lock_guard, ele tenta tomar posse do mutex é dado. Quando o controle deixa o âmbito no qual o objeto lock_guard foi criado, o lock_guard é destruída eo mutex é liberado.
Original:
When a lock_guard object is created, it attempts to take ownership of the mutex it is given. When control leaves the scope in which the lock_guard object was created, the lock_guard is destructed and the mutex is released.
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A classe lock_guard não é copiável. O tipo Mutex fornecido deve implementar o conceito BasicLockable.
Original:
The lock_guard class is non-copyable. The supplied Mutex type shall implement the BasicLockable concept.
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[editar] Tipos de membro

Tipo de membro
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Member type
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 Definition
mutex_type
Mutex
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Mutex
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[editar] Funções de membro
constrói um lock_guard, opcionalmente bloquear o mutex dado
Original:
constructs a lock_guard, optionally locking the given mutex
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(função pública membro) [edit]
destrói o objeto lock_guard, destrava o mutex subjacente
Original:
destructs the lock_guard object, unlocks the underlying mutex
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(função pública membro) [edit]

[editar] Exemplo

#include <thread>
#include <mutex>
 
int g_i = 0;
std::mutex g_i_mutex;  // protects g_i
 
void safe_increment()
{
    std::lock_guard<std::mutex> lock(g_i_mutex);
    ++g_i;
 
    // g_i_mutex is automatically released when lock
    // goes out of scope
}
 
int main()
{
    std::thread t1(safe_increment);
    std::thread t2(safe_increment);
 
    t1.join();
    t2.join();
}


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