InterlockedDecrementRelease function (Windows)

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InterlockedDecrementRelease function

Applies to: desktop apps | Metro style apps

Decrements (decreases by one) the value of the specified 32-bit variable as an atomic operation. The operation is performed with release memory access semantics.

Syntax

LONG __cdecl InterlockedDecrementRelease(
  __inout  LONG volatile *Addend
);

Parameters

Addend [in, out]: A pointer to the variable to be decremented.

Return value

The function returns the resulting decremented value.

Remarks

The variable pointed to by the Addend parameter must be aligned on a 32-bit boundary; otherwise, this function will behave unpredictably on multiprocessor x86 systems and any non-x86 systems. See _aligned_malloc.

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 _InterlockedDecrement_rel.

This function is supported only on Itanium-based systems.

For processors that do not support release memory access semantics, this function is defined as a call to the InterlockedDecrement function. For more information, see WinBase.h.

Requirements

Minimum supported client	Windows Vista
Minimum supported server	Windows Server 2003
Header	WinBase.h (include Windows.h)