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Sets a 32-bit variable to the specified value as an atomic operation. The operation is performed using acquire memory ordering semantics.
Syntax
LONG __cdecl InterlockedExchangeAcquire(
_Inout_ LONG volatile *Target,
_In_ LONG Value
);
Parameters
Target [in, out]
A pointer to the value to be exchanged. The function sets this variable to Value, and returns its prior value.Value [in]
The value to be exchanged with the value pointed to by Target.
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 _InterlockedExchange_acq.
Note This function is supported on Windows RT-based systems.
Requirements
Header |
Winnt.h (include Windows.h) |
See also
InterlockedExchangePointerAcquire