atomic_store, atomic_store_explicit

< c‎ | atomic
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 by obj with desired. The operation is atomic write operation.

The first version orders memory accesses according to memory_order_seq_cst, the second version orders memory accesses according to order. order must be one of memory_order_relaxed, memory_order_release or memory_order_seq_cst. Otherwise the behavior is undefined.

This is a generic function defined for all atomic object types A. The argument is pointer to a volatile atomic type to accept addresses of both non-volatile and volatile (e.g. memory-mapped I/O) atomic variables.C is the non-atomic type corresponding to A.


obj - pointer to the atomic object to modify
order - the memory synchronization ordering for this operation

Return value



  • C11 standard (ISO/IEC 9899:2011):
  • The atomic_store generic functions (p: 282)

See also

reads a value from an atomic object
C++ documentation for atomic_store, atomic_store_explicit