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atomic_exchange, atomic_exchange_explicit

From cppreference.com
< c‎ | atomic
Defined in header <stdatomic.h>
C atomic_exchange( volatile A* obj, C desired );
(1) (since C11)
C atomic_exchange_explicit( volatile A* obj, C desired, memory_order order );
(2) (since C11)

Atomically replaces the value pointed by obj with desired and returns the value obj held previously. The operation is read-modify-write operation. The first version orders memory accesses according to memory_order_seq_cst, the second version orders memory accesses according to order.

This is a generic function defined for all atomic object types. A is the type of an atomic object, C is the non-atomic type corresponding to A.

[edit] Parameters

obj - pointer to the atomic object to modify
desired - the value to replace the atomic object with
order - the memory synchronization ordering for this operation: all values are permitted

[edit] Return value

The value held previously be the atomic object pointed to by obj.

[edit] See also

swaps a value with the an atomic object if the old value is what is expected, otherwise reads the old value
(function) [edit]
C++ documentation for atomic_exchange, atomic_exchange_explicit