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std::atomic_thread_fence

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>
extern "C" void atomic_thread_fence( std::memory_order order );
(C++11およびそれ以降)
関連するアトミック操作せず、としてorderによって指示非アトミックとリラックスした不可分なアクセスの順序付けメモリ同期を確立する。たとえば、スレッド内std::memory_order_releaseフェンスの前に起こるすべての非アトミックとリラックスしたアトミックストアはstd::memory_order_acquireフェンス後に、スレッドBに作ったのと同じ場所から非原子的でリラックスしたアトミック負荷で同期されます.
Original:
Establishes memory synchronization ordering of non-atomic and relaxed atomic accesses, as instructed by order, without an associated atomic operation. For example, all non-atomic and relaxed atomic stores that happen before a std::memory_order_release fence in thread A will be synchronized with non-atomic and relaxed atomic loads from the same locations made in thread B after an std::memory_order_acquire fence.
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目次

[編集] パラメータ

order -
メモリはこのフェンスによって実行順序
Original:
the memory ordering executed by this fence
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[編集] 値を返します

(なし)
Original:
(none)
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[編集] 例外

noexcept specification:  
noexcept
  (C++11およびそれ以降)

[編集]

Scan an array of mailboxes, and process only the ones intended for us, without unnecessary synchronization.

const int num_mailboxes = 32;
std::atomic<int> mailbox[num_mailboxes];
 
// The writer threads update non-atomic shared data and then update mailbox[i] as follows
 std::atomic_store_explicit(&mailbox[i], std::memory_order_release);
 
// Reader thread needs to check all mailbox[i], but only needs to sync with one
 for (int i = 0; i < num_mailboxes; ++i) {
    if (std::atomic_load_explicit(&mailbox[i],  std::memory_order_relaxed) == my_id) {
        std::atomic_thread_fence(std::memory_order_acquire); // synchronize with just one writer
        do_work(i); // guaranteed to observe everything done in the writer thread before
                    // the atomic_store_explicit()
    }
 }


[編集] も参照してください

与えられたアトミック操作用のメモリ順序の制約を定義しています
Original:
defines memory ordering constraints for the given atomic operation
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(typedef) [edit]
スレッドと同じスレッドで実行されるシグナルハンドラの間のフェンス
Original:
fence between a thread and a signal handler executed in the same thread
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(関数) [edit]
C documentation for atomic_thread_fence