[#BloombergLP-bsls-AtomicOperations_ALL_ALL_ClangIntrinsics-testAndSwapInt64AcqRel]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::xref:BloombergLP/bsls/AtomicOperations_ALL_ALL_ClangIntrinsics.adoc[AtomicOperations_ALL_ALL_ClangIntrinsics]::testAndSwapInt64AcqRel
:relfileprefix: ../../../
:mrdocs:

Conditionally set the value of the specified `atomicInt` to the specified `swapValue` if and only if the value of `atomicInt` equals the value of the specified `compareValue`, and return the initial value of `atomicInt`, providing the acquire/release memory ordering guarantee. The whole operation is performed atomically.

== Synopsis

Declared in `<bsls_atomicoperations_all_all_clangintrinsics.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
xref:BloombergLP/bsls/Types/Int64.adoc[Types::Int64]
testAndSwapInt64AcqRel(
    xref:BloombergLP/bsls/Atomic_TypeTraits-0b/Int64.adoc[AtomicTypes::Int64]* atomicInt,
    xref:BloombergLP/bsls/Types/Int64.adoc[Types::Int64] compareValue,
    xref:BloombergLP/bsls/Types/Int64.adoc[Types::Int64] swapValue);
----


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