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      std::atomic_is_lock_free, ATOMIC_xxx_LOCK_FREE

      De cppreference.com

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      <metanoindex/>

       
      C++
       
      Biblioteca operações atômica
      Tipos
      Original:
      Types
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      (C++11)
      (C++11)
      Funções
      Original:
      Functions
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      (C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)(C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      Bandeiras atômicas
      Original:
      Atomic flags
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      (C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      Inicialização
      Original:
      Initialization
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      (C++11)
      (C++11)
      (C++11)
      Memória de encomenda
      Original:
      Memory ordering
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      (C++11)
      (C++11)
      (C++11)
      (C++11)
       
      <tbody> </tbody>
      Definido no cabeçalho <atomic>
      template< class Atomic > bool atomic_is_lock_free(const volatile Atomic* obj)
      		 (1) (desde C++11)
      template< class Atomic > bool atomic_is_lock_free(const Atomic* obj)
      		 (2) (desde 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) (desde 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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      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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      Parâmetros

      obj -
      ponteiro para o objeto atômico para examinar
      Original:
      pointer to the atomic object to examine
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      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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      Exceções

      noexcept specification:  
      <tbody> </tbody>
      noexcept
        (desde C++11)

      Exemplo

      Esta seção está incompleta
      Motivo: sem exemplo

      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)
      (C++11)
      o lock-livre tipo boolean atômica
      Original:
      the lock-free boolean atomic type
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      (classe) [edit]