std::atomic_is_lock_free, ATOMIC_xxx_LOCK_FREE

 

C++

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Libreria di Utilità

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Algoritmi

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Libreria matematca

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Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Atomic operazioni di biblioteca

Tipi 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)

Funzioni 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)

Bandiere Atomic 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)

Inizializzazione 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 di ordinazione 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)

 

Elemento definito nell'header <atomic>
template<class Atomic > bool atomic_is_lock_free(constvolatile 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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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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Parametri

obj

-

puntatore all'oggetto atomico di esaminare Original: pointer to the atomic object to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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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Eccezioni

noexcept specification:  

noexcept

  (dal C++11)

Vedi anche

is_lock_free	controlla se l'oggetto atomico è senza blocchi Original: checks if the atomic object is lock-free The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
std::atomic_is_lock_free(std::shared_ptr)	specializzata operazioni atomiche per std::shared_ptr Original: specializes atomic operations for std::shared_ptr The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello)
atomic_flag (C++11)	il blocco privo di tipo booleano atomica Original: the lock-free boolean atomic type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe)