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title <atomic> enums | Microsoft Docs
ms.custom
ms.date 11/04/2016
ms.reviewer
ms.suite
ms.tgt_pltfrm
ms.topic article
f1_keywords
atomic/std::memory_order
ms.assetid cd3a81c5-a19e-448f-952a-c34c717f21a9
caps.latest.revision 11
helpviewer_keywords
std::memory_order
manager ghogen

<atomic> enums

memory_order Enum

Supplies symbolic names for synchronization operations on memory locations. These operations affect how assignments in one thread become visible in another.

typedef enum memory_order {
    memory_order_relaxed,
    memory_order_consume,
    memory_order_acquire,
    memory_order_release,
    memory_order_acq_rel,
    memory_order_seq_cst,
} memory_order;

Remarks
memory_order_relaxed No ordering required.
memory_order_consume A load operation acts as a consume operation on the memory location.
memory_order_acquire A load operation acts as an acquire operation on the memory location.
memory_order_release A store operation acts as a release operation on the memory location.
memory_order_acq_rel Combines memory_order_acquire and memory_order_release.
memory_order_seq_cst Combines memory_order_acquire and memory_order_release. Memory accesses that are marked as memory_order_seq_cst must be sequentially consistent.

See Also

<atomic>