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InterlockedAdd function

Performs an atomic addition operation on the specified LONG values.

Syntax


LONG __cdecl InterlockedAdd(
  _Inout_  LONG volatile *Addend,
  _In_     LONG Value
);

Parameters

Addend [in, out]

A pointer to the first operand. This value will be replaced with the result of the operation.

Value [in]

The second operand.

Return value

The function returns the result of the operation.

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 _InterlockedAdd.

This function generates a full memory barrier (or fence) to ensure that memory operations are completed in order.

Note  This function is supported on Windows RT-based systems.

Note  Windows 8 does not support Itanium-based systems.

Requirements

Header

Winnt.h (include Windows.h)

See also

Interlocked Variable Access
InterlockedAddAcquire
InterlockedAddRelease
InterlockedAddNoFence
InterlockedAdd64
InterlockedAddAcquire64
InterlockedAddRelease64
InterlockedAddNoFence64
InterlockedExchangeAdd
Synchronization Functions

 

 

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