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atomic_fetch_add, atomic_fetch_add_explicit

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< c‎ | atomic

 
 
Atomique opérations de la bibliothèque
Types
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Types
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memory_order
atomic_flag
Macros
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Macros
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ATOMIC_***_LOCK_FREE
ATOMIC_FLAG_INIT
ATOMIC_VAR_INIT
kill_dependency
Fonctions
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Functions
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atomic_flag_test_and_set
atomic_flag_clear
atomic_init
atomic_is_lock_free
atomic_store
atomic_load
atomic_exchange
atomic_compare_exchange
atomic_fetch_add
atomic_fetch_sub
atomic_fetch_or
atomic_fetch_xor
atomic_fetch_and
atomic_thread_fence
atomic_signal_fence
 
Defined in header <stdatomic.h>
C atomic_fetch_add( volatile A* obj, M arg );
(1)
C atomic_fetch_add_explicit( volatile A* obj, M arg, memory_order order );
(2)
Remplace atomiquement la valeur pointée par obj avec le résultat de l'addition de arg à l'ancienne valeur de obj, et renvoie la valeur obj occupait précédemment. L'opération est de lecture-modification-écriture. La première version de la mémoire accède à savoir selon la memory_order_seq_cst, la deuxième version de mémoire accède à savoir selon la order .
Original:
Atomically replaces the value pointed by obj with the result of addition of arg to the old value of obj, and returns the value obj held previously. The operation is read-modify-write operation. The first version orders memory accesses according to memory_order_seq_cst, the second version orders memory accesses according to order.
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Il s'agit d'une fonction générique définis pour tous les types d'objets atomiques. A est le type d'un objet atomique, M est soit du type non atomique correspondant à A si A est atomique de type entier, ou si ptrdiff_t A est de type pointeur atomique .
Original:
This is a fonction générique defined for all atomic object types. A is the type of an atomic object, M is either the non-atomic type corresponding to A if A is atomic integer type, or ptrdiff_t if A is atomic pointer type.
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Pour les types entiers signés, l'arithmétique est défini pour utiliser la représentation en complément à deux. Il
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For signed integer types, arithmetic is defined to use two’s complement representation. There
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n'y a pas de résultats indéfinis. Pour les types pointeur, le résultat peut être une adresse définie, mais les opérations n'ont autrement pas de comportement indéfini .
Original:
are no undefined results. For pointer types, the result may be an undefined address, but the operations otherwise have no undefined behavior.
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[modifier] Paramètres

obj -
pointeur vers l'objet à modifier atomique
Original:
pointer to the atomic object to modify
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arg -
la valeur à ajouter à la valeur stockée dans l'objet atomique
Original:
the value to add to the value stored in the atomic object
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order -
la synchronisation de mémoire de commande pour cette opération: toutes les valeurs sont autorisées
Original:
the memory synchronization ordering for this operation: all values are permitted
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[modifier] Retourne la valeur

La valeur détenait auparavant l'objet atomique pointée par obj .
Original:
The value held previously be the atomic object pointed to by obj.
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[modifier] Voir aussi

atomique soustraction
Original:
atomic subtraction
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(fonction) [edit]
C++ documentation for atomic_fetch_add, atomic_fetch_add_explicit