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std::mutex::lock

De cppreference.com
< cpp‎ | thread‎ | mutex

 
 
Tema Biblioteca de ayuda
Threads
Original:
Threads
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(C++11)
this_thread espacio de nombres
Original:
this_thread namespace
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(C++11)
(C++11)
(C++11)
Exclusión mutua
Original:
Mutual exclusion
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(C++11)
Gestión de bloqueos genérico
Original:
Generic lock management
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(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)
Futuros
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Futures
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(C++11)
(C++11)
(C++11)
(C++11)
 
std::mutex
Las funciones miembro
Original:
Member functions
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Bloqueo
Original:
Locking
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mutex::lock
Identificador nativo
Original:
Native handle
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void lock();
(desde C++11)
Bloquea el mutex. Si otro hilo ya ha bloqueado el mutex, una llamada a lock bloqueará la ejecución hasta que se adquiere el bloqueo .
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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Contenido

[editar] Parámetros

(Ninguno)
Original:
(none)
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[editar] Valor de retorno

(Ninguno)
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(none)
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[editar] Excepciones

Lanza std::system_error cuando se producen errores, incluidos los errores del sistema operativo subyacente que impida lock de cumplir sus especificaciones .
Original:
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] Ejemplo

Este ejemplo muestra cómo lock unlock y se puede utilizar para proteger los datos compartidos .
Original:
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();
}

Posible salida:

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

[editar] Ver también

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
Original:
unlocks the mutex
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(función miembro público) [editar]