atomic_fetch_or, atomic_fetch_or_explicit
From cppreference.com
Defined in header
<stdatomic.h>
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C atomic_fetch_or( volatile A* obj, M arg );
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(1) | (since C11) |
C atomic_fetch_or_explicity( volatile A* obj, M arg, memory_order order );
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(2) | (since C11) |
Atomically replaces the value pointed by obj
with the result of bitwise OR between the old value of obj
and arg
, 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, M
is either the non-atomic type corresponding to A
if A
is atomic integer type, or ptrdiff_t if A
is atomic pointer type.
Contents |
[edit] Parameters
obj | - | pointer to the atomic object to modify |
arg | - | the value to bitwise OR to the value stored in the atomic object |
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):
-
- 7.17.7.5 The atomic_fetch and modify generic functions (p: 284-285)
[edit] See also
atomic_fetch_oratomic_fetch_or_explicit
(C11)
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atomic logical OR (function) |
atomic logical exclusive OR (function) |
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C++ documentation for atomic_fetch_or, atomic_fetch_or_explicit
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