InterlockedAdd function (winnt.h)

Performs an atomic addition operation on the specified LONG values.

Syntax

LONG InterlockedAdd(
  [in, out] LONG volatile *Addend,
  [in]      LONG          Value
);

Parameters

[in, out] Addend

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

[in] Value

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.

 

Requirements

Requirement	Value
Target Platform	Windows
Header	winnt.h (include Windows.h)

See also

Interlocked Variable Access

InterlockedAdd64

InterlockedAddAcquire

InterlockedAddAcquire64

InterlockedAddNoFence

InterlockedAddNoFence64

InterlockedAddRelease

InterlockedAddRelease64

InterlockedExchangeAdd

Synchronization Functions