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操作

std::atomic_exchange, std::atomic_exchange_explicit

提供: cppreference.com
< cpp‎ | atomic

 
 
アトミック操作ライブラリ
タイプ
Original:
Types
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atomic(C++11)
atomic_is_lock_free(C++11)
機能します
Original:
Functions
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atomic_store
atomic_store_explicit
(C++11)
(C++11)
atomic_load
atomic_load_explicit
(C++11)
(C++11)
atomic_exchange
atomic_exchange_explicit
(C++11)
(C++11)
atomic_compare_exchange_weak
atomic_compare_exchange_weak_explicit
atomic_compare_exchange_strong
atomic_compare_exchange_strong_explicit
(C++11)
(C++11)
(C++11)
(C++11)
atomic_fetch_add
atomic_fetch_add_explicit
(C++11)
(C++11)
atomic_fetch_sub
atomic_fetch_sub_explicit
(C++11)
(C++11)
atomic_fetch_and
atomic_fetch_and_explicit
(C++11)
(C++11)
atomic_fetch_or
atomic_fetch_or_explicit
(C++11)
(C++11)
atomic_fetch_xor
atomic_fetch_xor_explicit
(C++11)
(C++11)
アトミックのフラグ
Original:
Atomic flags
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atomic_flag(C++11)
atomic_flag_test_and_set
atomic_flag_test_and_set_explicit
(C++11)
(C++11)
atomic_flag_clear
atomic_flag_clear_explicit
(C++11)
(C++11)
初期化
Original:
Initialization
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atomic_init(C++11)
ATOMIC_VAR_INIT(C++11)
ATOMIC_FLAG_INIT(C++11)
メモリは発注
Original:
Memory ordering
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memory_order(C++11)
kill_dependency(C++11)
atomic_thread_fence(C++11)
atomic_signal_fence(C++11)
 
Defined in header <atomic>
template< class T >
T atomic_exchange( std::atomic<T>* obj, T desr );
(1) (C + + 11以来)
template< class T >
T atomic_exchange( volatile std::atomic<T>* obj, T desr );
(2) (C + + 11以来)
template< class T >

T atomic_exchange_explicit( std::atomic<T>* obj, T desr,

                            std::memory_order order );
(3) (C + + 11以来)
template< class T >

T atomic_exchange_explicit( volatile std::atomic<T>* obj, T desr,

                            std::memory_order order );
(4) (C + + 11以来)
1-2)
アトミックobjの値を持つdesrが指す値を置き換え、objであるかのように、以前に開催された値obj->exhange(desr)を返します
Original:
Atomically replaces the value pointed to by obj with the value of desr and returns the value obj held previously, as if by obj->exhange(desr)
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3-4)
アトミックobjの値を持つdesrが指す値を置き換え、objであるかのように、以前に開催された値obj->exhange(desr, order)を返します
Original:
Atomically replaces the value pointed to by obj with the value of desr and returns the value obj held previously, as if by obj->exhange(desr, order)
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目次

[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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desr -
原子オブジェクトに格納する値
Original:
the value to store in the atomic object
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order -
メモリsycnhronization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 sycnhronization ordering for this operation: all values are permitted.
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[編集] 値を返します

原子オブジェクトによって以前に開催された値がobjが指す
Original:
The value held previously by the atomic object pointed to by obj
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[編集] 例外

noexcept specification:  
noexcept
  (C + + 11以来)

[編集]

スピンロックmutexはatomic_flag_test_and_setに似アトミック交換操作を使用して、ユーザ空間で実装することができます
Original:
A spinlock mutex can be implemented in userspace using an atomic exchange operation, similar to atomic_flag_test_and_set
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#include <thread>
#include <vector>
#include <iostream>
#include <atomic>
 
std::atomic<bool> lock = ATOMIC_VAR_INIT(false);
 
void f(int n)
{
    for(int cnt = 0; cnt < 100; ++cnt) {
        while(std::atomic_exchange_explicit(&lock, true, std::memory_order_acquire))
             ; // spin until acquired
        std::cout << "Output from thread " << n << '\n';
        std::atomic_store_explicit(&lock, false, std::memory_order_release);
    }
}
int main()
{
    std::vector<std::thread> v;
    for (int n = 0; n < 10; ++n) {
        v.emplace_back(f, n);
    }
    for (auto& t : v) {
        t.join();
    }
}

Output:

Output from thread 2
Output from thread 6
Output from thread 7
...<exactly 1000 lines>...

[編集] も参照してください

(C++11)
アトミックアトミックオブジェクトの値を交換し、以前に保持している値を取得します
Original:
atomically replaced the value of the atomic object and obtains the value held previously
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(パブリックメンバ関数of std::atomic) [edit]
アトミックに非アトミック引数でアトミックオブジェクトの値を比較し、等しいか、またはアトミックロードする場合しない場合、原子交換を行う
Original:
atomically compares the value of the atomic object with non-atomic argument and performs atomic exchange if equal or atomic load if not
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(関数テンプレート) [edit]
std::shared_ptrためのアトミック操作を専門としています
Original:
specializes atomic operations for std::shared_ptr
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(関数テンプレート)
C documentation for atomic_exchange, atomic_exchange_explicit