atomic_exchange, atomic_exchange_explicit
From cppreference.com
Defined in header
<stdatomic.h>
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C atomic_exchange( volatile A* obj, C desired );
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(1) | (since C11) |
C atomic_exchange_explicit( volatile A* obj, C desired, memory_order order );
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(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
.
Contents |
[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] References
- C11 standard (ISO/IEC 9899:2011):
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- 7.17.7.3 The atomic_exchange generic functions (p: 283)
[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) |
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C++ documentation for atomic_exchange, atomic_exchange_explicit
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