Espaços nominais
Variantes
Acções

std::atomic_is_lock_free, ATOMIC_xxx_LOCK_FREE

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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
Original:
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
Original:
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>
template< class Atomic >
bool atomic_is_lock_free(const volatile Atomic* obj)
(1) (a partir do C++ 11)
template< class Atomic >
bool atomic_is_lock_free(const Atomic* obj)
(2) (a partir do C++ 11)
#define ATOMIC_CHAR_LOCK_FREE     /* unspecified */

#define ATOMIC_CHAR16_T_LOCK_FREE /* unspecified */
#define ATOMIC_CHAR32_T_LOCK_FREE /* unspecified */
#define ATOMIC_WCHAR_T_LOCK_FREE  /* unspecified */
#define ATOMIC_SHORT_LOCK_FREE    /* unspecified */
#define ATOMIC_INT_LOCK_FREE      /* unspecified */
#define ATOMIC_LONG_LOCK_FREE     /* unspecified */
#define ATOMIC_LLONG_LOCK_FREE    /* unspecified */

#define ATOMIC_POINTER_LOCK_FREE  /* unspecified */
(3) (a partir do C++ 11)
1-2)
Determina se o objeto atômico apontado por obj é implementado sem bloqueio, como se chamando obj->is_lock_free()
Original:
Determines if the atomic object pointed to by obj is implemented lock-free, as if by calling obj->is_lock_free()
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3)
Expande a uma expressão constante inteira com 0 valor para o built-in tipos atômicos que nunca são lock-livre, para 1 para o built-in tipos atômicos, que são, por vezes, sem bloqueio, e para 2 para o built-in tipos atômicos que são sempre lock-livre.
Original:
Expands to an integer constant expression with value 0 for the built-in atomic types that are never lock-free, to 1 for the built-in atomic types that are sometimes lock-free, and to 2 for the built-in atomic types that are always lock-free.
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Índice

[editar] Notas

Todos os tipos atômicos, exceto para std::atomic_flag podem ser implementados usando semáforos ou operações de bloqueio outros, em vez de usar os sem bloqueio instruções da CPU atômicas. Tipos atômicos também estão autorizados a ser às vezes lock-livre, por exemplo, se os acessos à memória apenas alinhados são naturalmente atômica sobre uma dada arquitetura, os objetos desalinhados do mesmo tipo tem que usar fechaduras. Se o tipo é, por vezes, sem bloqueio, em seguida, a função de (1-2) ou o seu equivalente função de membro tem de ser usado para determinar se o caso em particular é livre de bloqueio.
Original:
All atomic types except for std::atomic_flag may be implemented using mutexes or other locking operations, rather than using the lock-free atomic CPU instructions. Atomic types are also allowed to be sometimes lock-free, e.g. if only aligned memory accesses are naturally atomic on a given architecture, misaligned objects of the same type have to use locks. If the type is sometimes lock-free, then the function (1-2) or its member function equivalent has to be used to determine if the particular instance is lock-free.
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[editar] Parâmetros

obj -
ponteiro para o objeto atômico para examinar
Original:
pointer to the atomic object to examine
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[editar] Valor de retorno

true se *obj é um lock-livre atômica, false outra forma.
Original:
true if *obj is a lock-free atomic, false otherwise.
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[editar] Exceções

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

[editar] Exemplo

[editar] Veja também

Verifica se o objeto atômico é lock-livre
Original:
checks if the atomic object is lock-free
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(of std::atomic função pública membro) [edit]
especializada operações atômicas para std::shared_ptr
Original:
specializes atomic operations for std::shared_ptr
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(modelo de função)
o lock-livre tipo boolean atômica
Original:
the lock-free boolean atomic type
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(classe) [edit]