Sets a 32-bit variable to the specified value as an atomic operation. The operation is performed using acquire memory ordering semantics.
LONG __cdecl InterlockedExchangeAcquire( _Inout_ LONG volatile *Target, _In_ LONG Value );
Target [in, out]
A pointer to the value to be exchanged. The function sets this variable to Value, and returns its prior value.
The value to be exchanged with the value pointed to by Target.
The function returns the initial value of the Target parameter.
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.
|Winnt.h (include Windows.h)|