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A function call specifies an atomic memory order that is not memory_order_seq_cst.
Checks for this warning class apply to the stdatomic.h functions that have explicit atomic memory order (memory_order) parameters.
| クラス名 | Risky Atomic Memory Order | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 日本語クラス名 | Risky Atomic Memory Order | |||||||||
| クラス分類 | 信頼性 (reliability) | |||||||||
| ニーモニック | CONCURRENCY.C_ATOMIC.MO | |||||||||
| カテゴリー |
|
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| 対応言語 | C および C++ で利用可能です。 |
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| 有効/無効設定 | このワーニングクラスのチェックはデフォルトで無効になっています。チェックを有効にするにはプロジェクト設定ファイル
(configuration file)に以下の WARNING_FILTER ルールを追加してください。
WARNING_FILTER += allow class="Risky Atomic Memory Order" |
#include <stdatomic.h>
_Atomic int avar;
void c_atomic_mo( void ) {
int nvar = 1;
atomic_init(&avar, nvar+1);
nvar += atomic_load(&avar); /* ok: atomic_load() uses memory_order_seq_cst implicitly */
nvar += atomic_load_explicit(&avar, memory_order_seq_cst); /* ok: call specifies memory_order_seq_cst explicitly */
/* 'Risky Atomic Memory Order' warning issued on following line
* - call specifies memory_order_relaxed
*/
nvar += atomic_load_explicit(&avar, memory_order_relaxed);
/* 'Risky Atomic Memory Order' warning issued on following line
* - call specifies memory_order_relaxed
*/
atomic_store_explicit(&avar, nvar, memory_order_relaxed);
}
設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。