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atomic_fetch_sub, atomic_fetch_sub_explicit

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< c‎ | atomic

 
 
Operaciones de biblioteca Atómica
Tipos
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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
Funciones
Original:
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_sub( volatile A* obj, M arg );
(1)
C atomic_fetch_sub_explicit( volatile A* obj, M arg, memory_order order );
(2)
Atómicamente sustituye el valor señalado por obj con el resultado de la resta de arg desde el antiguo valor de obj, y devuelve el valor obj llevado a cabo previamente. La operación es de lectura-modificación-escritura de la operación. La primera versión de memoria de acuerdo con las órdenes accede memory_order_seq_cst, la segunda versión de la memoria de órdenes de acceso de acuerdo con order .
Original:
Atomically replaces the value pointed by obj with the result of subtraction of arg from 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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Este es un función genérica definida para todos los tipos de objetos atómicos. A es el tipo de un objeto atómico, M o es del tipo no-atómico correspondiente a A A si es de tipo atómico entero o ptrdiff_t A si es de tipo puntero atómica .
Original:
This is a función genérica 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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Para firmados los tipos enteros, la aritmética se define a utilizar representación complementaria de dos. Ya está
Original:
For signed integer types, arithmetic is defined to use two’s complement representation. There
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hay resultados no definidos. Para los tipos de puntero, el resultado puede ser una dirección definida, pero las operaciones de otra manera no tienen un comportamiento no definido .
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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[editar] Parámetros

obj -
puntero al objeto atómico modificar
Original:
pointer to the atomic object to modify
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arg -
el valor que se resta del valor almacenado en el objeto atómico
Original:
the value to subtract from the value stored in the atomic object
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order -
la sincronización de la memoria de ordenación para esta operación: todos los valores están permitidos
Original:
the memory synchronization ordering for this operation: all values are permitted
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[editar] Valor de retorno

El valor que tenía antes ser objeto atómica apuntada por obj .
Original:
The value held previously be the atomic object pointed to by obj.
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[editar] Ver también

Además atómica
Original:
atomic addition
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(función) [edit]
C++ documentation for atomic_fetch_sub, atomic_fetch_sub_explicit