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Defined in header <stdatomic.h> | ||
void atomic_store(volatile A* obj , C desired); | (1) | (since C11) |
void atomic_store_explicit(volatile A* obj, C desired,memory_order order); | (2) | (since C11) |
Atomically replaces the value of the atomic variable pointed to byobj withdesired. The operation is atomic write operation.
The first version orders memory accesses according tomemory_order_seq_cst, the second version orders memory accesses according toorder.order must be one ofmemory_order_relaxed,memory_order_release ormemory_order_seq_cst. Otherwise the behavior is undefined.
This is ageneric function defined for allatomic object typesA. The argument is pointer to a volatile atomic type to accept addresses of both non-volatile andvolatile (e.g. memory-mapped I/O) atomic objects, and volatile semantic is preserved when applying this operation to volatile atomic objects.C is the non-atomic type corresponding toA.
It is unspecified whether the name of a generic function is a macro or an identifier declared with external linkage. If a macro definition is suppressed in order to access an actual function (e.g. parenthesized like(atomic_store)(...)), or a program defines an external identifier with the name of a generic function, the behavior is undefined.
Contents |
| obj | - | pointer to the atomic object to modify |
| order | - | the memory synchronization ordering for this operation |
(none)
| reads a value from an atomic object (function)[edit] | |
C++ documentation foratomic_store,atomic_store_explicit | |
