Espaços nominais
Variantes
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std::atomic_thread_fence

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< cpp‎ | atomic

 
 
Biblioteca operações atômica
Tipos
Original:
Types
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atomic(C++11)
atomic_is_lock_free(C++11)
Funções
Original:
Functions
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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)
Bandeiras atômicas
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Atomic flags
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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)
Inicialização
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Initialization
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atomic_init(C++11)
ATOMIC_VAR_INIT(C++11)
ATOMIC_FLAG_INIT(C++11)
Memória de encomenda
Original:
Memory ordering
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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 );
(a partir do C++ 11)
Estabelece a sincronização de memória ordenação de não-atômicas e relaxado acessos atômicas, conforme instruções order, sem uma operação associada atômica. Por exemplo, todas as lojas não-atômicas e relaxado atômicas que acontecem antes de uma cerca std::memory_order_release no segmento A será sincronizado com os não-atômicas e relaxado cargas atômicas dos mesmos locais feitas no segmento B, após uma cerca 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.
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Índice

[editar] Parâmetros

order -
a memória ordenação executado por essa cerca
Original:
the memory ordering executed by this fence
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[editar] Valor de retorno

(Nenhum)
Original:
(none)
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[editar] Exceções

noexcept specification:  
noexcept
  (a partir do C++ 11)

[editar] Exemplos

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()
    }
 }


[editar] Veja também

define restrições de memória de encomenda para a operação dada atômica
Original:
defines memory ordering constraints for the given atomic operation
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(typedef) [edit]
cerca entre um fio e um manipulador de sinal executado no mesmo segmento
Original:
fence between a thread and a signal handler executed in the same thread
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(função) [edit]
C documentation for atomic_thread_fence