Sets a 64-bit variable to the specified value as an atomic operation. The operation is performed using acquire memory ordering semantics.
Syntax
LONGLONG __cdecl InterlockedExchangeAcquire64(
_Inout_ LONGLONG volatile Target,
_In_ LONGLONG Value
);
Parameters
Target [in, out]
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]
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.
Note This function is supported on Windows RT-based systems.
Requirements
Minimum supported client |
Windows Vista [desktop apps | UWP apps] |
Minimum supported server |
Windows Server 2003 [desktop apps | UWP apps] |
Header |
WinBase.h (include Windows.h) |
See also
InterlockedExchangePointerAcquire