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atomic_fetch_add, atomic_fetch_add_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_fetch_add( volatile A* obj, M arg );
(1)
C atomic_fetch_add_explicit( volatile A* obj, M arg, memory_order order );
(2)
Atomicamente substitui o valor apontado por obj com o resultado da adição de arg ao valor antigo de obj, e retorna o valor obj realizada anteriormente. A operação é ler-modificar-escrever a operação. A primeira versão de memória acessa ordens de acordo com memory_order_seq_cst, a segunda versão de memória acessa ordens de acordo com 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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Esta é uma função genérica definida para todos os tipos de objectos atómicos. A é o tipo de um objeto atômico, M ou é do tipo não-atômica correspondente a A se A é tipo inteiro atômica, ou ptrdiff_t se A é tipo ponteiro atômica.
Original:
This is a função 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 assinados tipos inteiros, aritmética é definida para usar dois representação de complemento. Lá
Original:
For signed integer types, arithmetic is defined to use two’s complement representation. There
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há resultados indefinidos. Por tipos de ponteiro, o resultado pode ser um endereço indefinido, mas as operações de outra forma não têm um comportamento indefinido.
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] Parâmetros

obj -
ponteiro para o objeto atômico modificar
Original:
pointer to the atomic object to modify
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arg -
o valor a adicionar ao valor armazenado no objeto atómica
Original:
the value to add to the value stored in the atomic object
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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

atômica subtração
Original:
atomic subtraction
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(função) [edit]
C++ documentation for atomic_fetch_add, atomic_fetch_add_explicit