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. 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 objects, and volatile semantic is preserved when applying this operation to volatile atomic objects. C is the non-atomic type corresponding to A.
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_exchange)(...)), or a program defines an external identifier with the name of a generic function, the behavior is undefined..
[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 valueThe value held previously be the atomic object pointed to by obj.
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