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std::mutex::lock

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< cpp‎ | thread‎ | mutex

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C++
 
Biblioteca de suporte a discussão
Threads
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Threads
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(C++11)
this_thread namespace
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this_thread namespace
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(C++11)
(C++11)
(C++11)
(C++11)
Exclusão mútua
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Mutual exclusion
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(C++11)
(C++11)
Gestão de bloqueio 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)
Variáveis ​​de condição
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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
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
 
void lock();
 (desde C++11)
Bloqueia o mutex. Se outro segmento já tenha travado o mutex, uma chamada para lock irá bloquear a execução até que o bloqueio é adquirido.
Original:
Locks the mutex. If another thread has already locked the mutex, a call to lock will block execution until the lock is acquired.
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Índice

[editar] Parâmetros

(Nenhum)
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(none)
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[editar] Valor de retorno

(Nenhum)
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(none)
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[editar] Exceções

Lança std::system_error quando ocorrem erros, incluindo erros do sistema operacional subjacente que impediriam lock de cumprir suas especificações.
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Throws std::system_error when errors occur, including errors from the underlying operating system that would prevent lock from meeting its specifications.
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Note

A program may deadlock if a thread that already owns a mutex calls lock on that mutex. Alternatively, if an implementation can detect the deadlock, a resource_deadlock_would_occur error condition may be observed.

[editar] Exemplo

Este exemplo mostra como lock unlock e pode ser utilizado para proteger os dados compartilhados .
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This example shows how lock and unlock can be used to protect shared data.
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#include <iostream>
#include <chrono>
#include <thread>
#include <mutex>
 
int g_num = 0;  // protected by g_num_mutex
std::mutex g_num_mutex;
 
void slow_increment(int id) 
{
  for (int i = 0; i < 3; ++i) {
    g_num_mutex.lock();
    ++g_num;
    std::cout << id << " => " << g_num << '\n';
    g_num_mutex.unlock();
 
    std::this_thread::sleep_for(std::chrono::seconds(1));
  }
}
 
int main()
{
  std::thread t1(slow_increment, 0);
  std::thread t2(slow_increment, 1);
  t1.join();
  t2.join();
}

Potencial saída: 

0 => 1
1 => 2
0 => 3
1 => 4
0 => 5
1 => 6

[editar] Veja também
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
Original:
unlocks the mutex
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(função pública membro) [edit]
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