std::atomic_thread_fence

 

C++

Idioma

Conceptos

Utilidades de la biblioteca

Strings biblioteca

Contenedores biblioteca

Algoritmos biblioteca

Los iteradores biblioteca

Numéricos biblioteca

Entrada / salida de la biblioteca

Localizaciones biblioteca

Expresiones biblioteca Regular (C++11)

Operaciones de biblioteca Atómica (C++11)

Tema Biblioteca de ayuda (C++11)

 

Operaciones de biblioteca Atómica

Tipos Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

atomic (C++11)

atomic_is_lock_free (C++11)

Funciones Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

atomic_store atomic_store_explicit (C++11) (C++11)

atomic_load atomic_load_explicit (C++11) (C++11)

atomic_exchange atomic_exchange_explicit (C++11) (C++11)

atomic_compare_exchange_weak atomic_compare_exchange_weak_explicit atomic_compare_exchange_strong atomic_compare_exchange_strong_explicit (C++11) (C++11) (C++11) (C++11)

atomic_fetch_add atomic_fetch_add_explicit (C++11) (C++11)

atomic_fetch_sub atomic_fetch_sub_explicit (C++11) (C++11)

atomic_fetch_and atomic_fetch_and_explicit (C++11) (C++11)

atomic_fetch_or atomic_fetch_or_explicit (C++11) (C++11)

atomic_fetch_xor atomic_fetch_xor_explicit (C++11) (C++11)

Banderas atómicas Original: Atomic flags The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

atomic_flag (C++11)

atomic_flag_test_and_set atomic_flag_test_and_set_explicit (C++11) (C++11)

atomic_flag_clear atomic_flag_clear_explicit (C++11) (C++11)

Inicialización Original: Initialization The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

atomic_init (C++11)

ATOMIC_VAR_INIT (C++11)

ATOMIC_FLAG_INIT (C++11)

Memoria pedido Original: Memory ordering The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

memory_order (C++11)

kill_dependency (C++11)

atomic_thread_fence (C++11)

atomic_signal_fence (C++11)

 

Defined in header <atomic>
extern "C" void atomic_thread_fence( std::memory_order order );		(ya que C + +11)

Establece la sincronización de la memoria ordenación de accesos atómicas no atómicas y relajado, como lo indicó order, sin una operación atómica asociada. Por ejemplo, todas las tiendas atómicas no atómicas y relajado que ocurren antes de una cerca std::memory_order_release hilo en A se sincroniza con cargas atómicas no atómicas y relajado de los mismos lugares realizadas en el subproceso B después de un cerco std::memory_order_acquire .

Original:

Establishes memory synchronization ordering of non-atomic and relaxed atomic accesses, as instructed by order, without an associated atomic operation. For example, all non-atomic and relaxed atomic stores that happen before a std::memory_order_release fence in thread A will be synchronized with non-atomic and relaxed atomic loads from the same locations made in thread B after an std::memory_order_acquire fence.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Parámetros

order

-

la memoria ordenamiento ejecutado por la valla Original: the memory ordering executed by this fence The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valor de retorno

(Ninguno)

Original:

(none)

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Excepciones

noexcept specification:  

noexcept

  (ya que C + +11)

Ejemplos

Scan an array of mailboxes, and process only the ones intended for us, without unnecessary synchronization.

const int num_mailboxes = 32;
std::atomic<int> mailbox[num_mailboxes];
 
// The writer threads update non-atomic shared data and then update mailbox[i] as follows
 std::atomic_store_explicit(&mailbox[i], std::memory_order_release);
 
// Reader thread needs to check all mailbox[i], but only needs to sync with one
 for (int i = 0; i < num_mailboxes; ++i) {
    if (std::atomic_load_explicit(&mailbox[i],  std::memory_order_relaxed) == my_id) {
        std::atomic_thread_fence(std::memory_order_acquire); // synchronize with just one writer
        do_work(i); // guaranteed to observe everything done in the writer thread before
                    // the atomic_store_explicit()
    }
 }

Ver también

memory_order (C++11)	define las limitaciones de memoria de pedido para la operación dada atómica Original: defines memory ordering constraints for the given atomic operation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (typedef)
atomic_signal_fence (C++11)	valla entre un hilo y un manejador de señales ejecuta en el mismo subproceso Original: fence between a thread and a signal handler executed in the same thread The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función)
C documentation for atomic_thread_fence