atomic_compare_exchange_weak, atomic_compare_exchange_strong, atomic_compare_exchange_weak_explicit, atomic_compare_exchange_strong_explicit

 

C

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Tema de ayuda (C11)

Operaciones atómicas (C11)

 

Operaciones de biblioteca Atómica

Tipos 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

Funciones 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)	(desde C11)
_Bool atomic_compare_exchange_weak( volatile A *obj,                                     C* expected, C desired );	(2)	(desde C11)
_Bool atomic_compare_exchange_strong_explicit( volatile A* obj,                                                C* expected, C desired,                                                memory_order succ,                                                memory_order fail );	(3)	(desde C11)
_Bool atomic_compare_exchange_weak_explicit( volatile A *obj,                                              C* expected, C desired,                                              memory_order succ,                                              memory_order fail );	(4)	(desde C11)

Atómicamente compara el valor apuntado por obj con el valor apuntado por expected, y si estos son iguales, sustituye a la anterior con desired (realiza lectura-modificación-escritura de la operación). De lo contrario, se carga el valor actual al que apunta obj en *expected (realiza la operación de carga) .

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).

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Los modelos de memoria para la lectura-modificación-escritura y las operaciones de carga son succ y fail respectivamente. Las versiones (1-2) memory_order_seq_cst utilizar por defecto .

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.

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Las formas débiles ((1) y (3)) de las funciones pueden fallar falsamente, es decir, actuar como si *obj != *expected incluso si son iguales. Cuando una comparación y el intercambio se encuentra en un bucle, la versión débil dará un mejor rendimiento en algunas plataformas. Cuando un débil comparación y el intercambio requeriría un lazo y una más fuerte no lo haría, el fuerte es preferible .

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.

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Este es un función genérica definida para todos los tipos de objetos atómicos. A es el tipo de un objeto atómico, C es del tipo no-atómico correspondiente a A .

Original:

This is a función genérica defined for all atomic object types. A is the type of an atomic object, C is the non-atomic type corresponding to A.

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Parámetros

obj	-	puntero al objeto atómico para probar y modificar 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	-	puntero al valor que se espera encontrar en el objeto atómico 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	-	el valor a almacenar en el objeto atómico si es como se esperaba 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 sincronización de la memoria de pedido para la lectura-modificación-escritura de la operación si la comparación tiene éxito. Todos los valores están permitidos . 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 sincronización de la memoria de pedido para la operación de carga si la comparación falla. No puede ser memory_order_release o memory_order_ack_rel y no se puede especificar más fuerte que el ordenamiento succ 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.

Valor de retorno

El resultado de la comparación: true si *obj era igual a *exp, false lo contrario .

Original:

The result of the comparison: true if *obj was equal to *exp, false otherwise.

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Ver también

atomic_exchange atomic_exchange_explicit (C11)	swaps un valor con el valor de un objeto atómico 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. (función)
C++ documentation for atomic_compare_exchange_weak, atomic_compare_exchange_strong, atomic_compare_exchange_weak_explicit, atomic_compare_exchange_strong_explicit