Espaces de noms
Variantes
Affichages
Actions

atomic_compare_exchange_weak, atomic_compare_exchange_strong, atomic_compare_exchange_weak_explicit, atomic_compare_exchange_strong_explicit

De cppreference.com
< c‎ | atomic

 
 
Atomique opérations de la bibliothèque
Types
Original:
Types
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
memory_order
atomic_flag
Macros
Original:
Macros
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
ATOMIC_***_LOCK_FREE
ATOMIC_FLAG_INIT
ATOMIC_VAR_INIT
kill_dependency
Fonctions
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_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>
_Bool atomic_compare_exchange_strong( volatile A* obj,
                                      C* expected, C desired );
(1)
_Bool atomic_compare_exchange_weak( volatile A *obj,
                                    C* expected, C desired );
(2)
_Bool atomic_compare_exchange_strong_explicit( volatile A* obj,

                                               C* expected, C desired,
                                               memory_order succ,

                                               memory_order fail );
(3)
_Bool atomic_compare_exchange_weak_explicit( volatile A *obj,

                                             C* expected, C desired,
                                             memory_order succ,

                                             memory_order fail );
(4)
Compare atomiquement la valeur pointée par obj avec la valeur pointée par expected, et si ceux-ci sont égaux, remplace l'ancien desired (effectue lecture-modification-écriture). Dans le cas contraire, la valeur réelle charge pointée par obj en *expected (effectue une opération de charge) .
Original:
Atomically compares the value pointed to by obj with the value pointed to by expected, and if those are equal, replaces the former with desired (performs read-modify-write operation). Otherwise, loads the actual value pointed to by obj into *expected (performs load operation).
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Les modèles de la mémoire pour la lecture-modification-écriture et les opérations de chargement et sont succ fail respectivement. Les versions (1-2) memory_order_seq_cst utiliser par défaut .
Original:
The memory models for the read-modify-write and load operations are succ and fail respectively. The (1-2) versions use memory_order_seq_cst by default.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Les formes faibles ((1) et (3)) des fonctions sont autorisés à ne pas faussement, qui est, comme si *obj != *expected même si elles sont égales. Quand une comparaison et d'échange est dans une boucle, la version faible donnera de meilleures performances sur certaines plates-formes. Quand un faible compare-and-échange, il faudrait une boucle et une forte ne serait pas, le fort est préférable .
Original:
The weak forms ((1) and (3)) of the functions are allowed to fail spuriously, that is, act as if *obj != *expected even if they are equal. When a compare-and-exchange is in a loop, the weak version will yield better performance on some platforms. When a weak compare-and-exchange would require a loop and a strong one would not, the strong one is preferable.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Il s'agit d'une fonction générique définis pour tous les types d'objets atomiques. A est le type d'un objet atomique, C est du type non-atomique correspondant à A .
Original:
This is a fonction générique defined for all atomic object types. A is the type of an atomic object, C is the non-atomic type corresponding to A.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifier] Paramètres

obj -
pointeur vers l'objet atomique pour tester et modifier
Original:
pointer to the atomic object to test and modify
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
expected -
pointeur à la valeur prévue pour être trouvé dans l'objet atomique
Original:
pointer to the value expected to be found in the atomic object
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
desired -
la valeur à stocker dans l'objet atomique si elle est conforme aux attentes
Original:
the value to store in the atomic object if it is as expected
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
succ -
la synchronisation de la mémoire de commande de lecture-modification-écriture, si la comparaison aboutit. Toutes les valeurs sont permises .
Original:
the memory synchronization ordering for the read-modify-write operation if the comparison succeeds. All values are permitted.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
fail -
la synchronisation de mémoire de commande pour l'opération de chargement si la comparaison échoue. Ne peut pas être memory_order_release ou memory_order_ack_rel et ne pouvez pas spécifier plus forte que succ ordre
Original:
the memory synchronization ordering for the load operation if the comparison fails. Cannot be memory_order_release or memory_order_ack_rel and cannot specify stronger ordering than succ
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifier] Retourne la valeur

Le résultat de la comparaison: si true *obj était égal à *exp, false autrement .
Original:
The result of the comparison: true if *obj was equal to *exp, false otherwise.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifier] Voir aussi

swaps d'une valeur avec la valeur d'un objet atomique
Original:
swaps a value with the value of an atomic object
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction) [edit]
C++ documentation for atomic_compare_exchange_weak, atomic_compare_exchange_strong, atomic_compare_exchange_weak_explicit, atomic_compare_exchange_strong_explicit