名前空間
変種
操作

atomic_fetch_add, atomic_fetch_add_explicit

提供: cppreference.com
< c‎ | atomic

 
 
アトミック操作ライブラリ
タイプ
Original:
Types
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memory_order
atomic_flag
マクロ
Original:
Macros
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ATOMIC_***_LOCK_FREE
ATOMIC_FLAG_INIT
ATOMIC_VAR_INIT
kill_dependency
機能します
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_add( volatile A* obj, M arg );
(1)
C atomic_fetch_add_explicit( volatile A* obj, M arg, memory_order order );
(2)
アトミックobjの古い値にargの加算結果とobjによって指された値に置き換えられ、以前に開催された値objを返します。操作は、リード·モディファイ·ライト操作です。最初のバージョンの受注メモリがmemory_order_seq_cstに従ってアクセスし、2番目のバージョンの受注メモリはorderに従ってアクセス.
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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これは、すべての原子オブジェクト·タイプに対して定義汎用関数です。 Aがアトミックオブジェクトの型である、MA場合Aアトミック整数型であるか、またはptrdiff_tAアトミックれるポインタ型場合に対応する非原子型で.
Original:
This is a 汎用関数 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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符号付き整数型の場合、演算は2の補数表現を使用するように定義されています。そこ
Original:
For signed integer types, arithmetic is defined to use two’s complement representation. There
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未定義の結果がありません。ポインタ型の場合、結果は未定義アドレスかもしれませんが、操作はそうしないと未定義の動作を持っていない.
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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[編集] パラメータ

obj -
変更するアトミックオブジェクトへのポインタ
Original:
pointer to the atomic object to modify
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arg -
原子オブジェクトに格納された値に追加する値
Original:
the value to add to the value stored in the atomic object
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order -
メモリ同期は、この操作の順序:すべての値が許可されています
Original:
the memory synchronization ordering for this operation: all values are permitted
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[編集] 値を返します

値は、以前objが指すアトミックオブジェクトでなければ開催された.
Original:
The value held previously be the atomic object pointed to by obj.
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[編集] も参照してください

アトミック減算
Original:
atomic subtraction
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(機能) [edit]
C++ documentation for atomic_fetch_add, atomic_fetch_add_explicit