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atomic_exchange, atomic_exchange_explicit

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Defined in header <stdatomic.h>
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C atomic_exchange( volatile A* obj, C desired );
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<td > (1) </td> <td > (since C11) </td> </tr> <tr class="t-dcl ">

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C atomic_exchange_explicit( volatile A* obj, C desired, memory_order order );
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<td > (2) </td> <td > (since C11) </td> </tr> Template:ddcl list end

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.

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

Return value

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

See also

Template:c/atomic/dcl list atomic compare exchange
C++ documentation for atomic_exchange, atomic_exchange_explicit