Espaços nominais
Variantes
Acções

atomic_exchange, atomic_exchange_explicit

Da cppreference.com
< c‎ | atomic

 
 
Biblioteca operações atômica
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
Funções
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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_exchange( volatile A* obj, C desired );
(1)
C atomic_exchange_explicit( volatile A* obj, C desired, memory_order order );
(2)

Atomically replaces the value pointed by obj with desired 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.

Esta é uma função genérica definida para todos os tipos de objectos atómicos. A é o tipo de um objeto atômico, C é do tipo não-atômica correspondente a A.
Original:
This is a função 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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[editar] Parâmetros

obj -
ponteiro para o objeto atômico modificar
Original:
pointer to the atomic object to modify
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desired - the value to replace the atomic object with
order -
a sincronização da memória de ordenação para esta operação: todos os valores são permitidos
Original:
the memory synchronization ordering for this operation: all values are permitted
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[editar] Valor de retorno

O valor realizado anteriormente ser objeto atômico apontado por obj.
Original:
The value held previously be the atomic object pointed to by obj.
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[editar] Veja também

swaps um valor com o objeto atômico se o valor antigo é o que se espera, caso contrário, lê o valor antigo
Original:
swaps a value with the an atomic object if the old value is what is expected, otherwise reads the old value
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(função) [edit]
C++ documentation for atomic_exchange, atomic_exchange_explicit