BloombergLP::bsls::AtomicOperations::testAndSwapIntAcqRel

Conditionally swap atomicInt with acquire/release ordering.

Synopsis

Declared in <bsls_atomicoperations.h>

static
int
testAndSwapIntAcqRel(
    AtomicTypes::Int* atomicInt,
    int compareValue,
    int swapValue);

Description

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.

Return Value

initial value of atomicInt before the operation

Parameters

Name

Description

atomicInt

atomic integer to test and possibly update

compareValue

expected current value of atomicInt

swapValue

value to store if the comparison succeeds

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