Namespace
Varianti

std::atomic_is_lock_free, ATOMIC_xxx_LOCK_FREE

Da cppreference.com.
< cpp‎ | atomic

 
 
Atomic operazioni di biblioteca
Tipi
Original:
Types
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atomic(C++11)
atomic_is_lock_free(C++11)
Funzioni
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)
Bandiere Atomic
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)
Inizializzazione
Original:
Initialization
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atomic_init(C++11)
ATOMIC_VAR_INIT(C++11)
ATOMIC_FLAG_INIT(C++11)
Memoria di ordinazione
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) (dal C++11)
template< class Atomic >
bool atomic_is_lock_free(const Atomic* obj)
(2) (dal 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) (dal C++11)
1-2)
Determina se l'oggetto atomico puntato da obj è attuato senza blocchi, come per chiamare 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)
Si espande un'espressione intera costante con 0 valore per il built-in tipi atomici che non sono mai senza blocchi, per 1 per il built-in tipi atomici che sono a volte senza blocchi, e per 2 per il built-in tipi atomici che sono sempre senza blocchi.
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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Indice

[modifica] Note

Tutti i tipi atomici tranne std::atomic_flag può essere implementato usando mutex o di operazioni di chiusura di altri, piuttosto che utilizzare il blocco senza istruzioni della CPU atomiche. Tipi atomici sono anche permesso di essere a volte senza blocchi, ad esempio, se gli accessi alla memoria solo allineati sono naturalmente atomica su una data architettura, oggetti allineati dello stesso tipo devono usare serrature. Se il tipo è talvolta senza blocchi, allora la funzione (1-2) o il suo equivalente funzione membro deve essere utilizzato per determinare se il caso particolare è senza blocchi.
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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[modifica] Parametri

obj -
puntatore all'oggetto atomico di esaminare
Original:
pointer to the atomic object to examine
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[modifica] Valore di ritorno

true se *obj è un lock-free atomico, false altrimenti.
Original:
true if *obj is a lock-free atomic, false otherwise.
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[modifica] Eccezioni

noexcept specification:  
noexcept
  (dal C++11)

[modifica] Esempio

[modifica] Vedi anche

controlla se l'oggetto atomico è senza blocchi
Original:
checks if the atomic object is lock-free
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(membro pubblico of std::atomic funzione) [edit]
specializzata operazioni atomiche per std::shared_ptr
Original:
specializes atomic operations for std::shared_ptr
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(funzione di modello)
il blocco privo di tipo booleano atomica
Original:
the lock-free boolean atomic type
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(classe) [edit]