Applies to: desktop apps | Metro style apps
Sets a 64-bit variable to the specified value as an atomic operation. The operation is performed using acquire memory access semantics.
Syntax
LONGLONG __cdecl InterlockedExchangeAcquire64( __inout LONGLONG volatile Target, __in LONGLONG Value );
Parameters
- Target [in, out]
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A pointer to the value to exchange. The function sets the value of this parameter to the value of the Value parameter, and returns the prior value of this parameter.
- Value [in]
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The value to be compared to the value of the Target parameter.
Return value
The function returns the initial value of the Target parameter.
Remarks
The interlocked functions provide a simple mechanism for synchronizing access to a variable that is shared by multiple threads. This function is atomic with respect to calls to other interlocked functions.
This function is implemented using a compiler intrinsic where possible. For more information, see the WinBase.h header file and _InterlockedExchange64_acq.
This function is supported only on Itanium-based systems.
Requirements
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Minimum supported client | Windows Vista |
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Minimum supported server | Windows Server 2003 |
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Header |
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See also
- Interlocked Variable Access
- InterlockedCompareExchangeAcquire64
- InterlockedExchange
- InterlockedExchange64
- InterlockedExchangePointer
- Synchronization Functions
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Build date: 3/7/2012