InterlockedDecrement64

InterlockedDecrement64 tests the specified bit of the specified LONG value and sets it to 0. The operation is atomic.

Syntax

LONGLONG InterlockedDecrement64(
        LONGLONG volatile *Addend
);

Parameters

Addend

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 64-bit boundary; otherwise, this function will behave unpredictably.

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 _InterlockedDecrement64.

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

To operate on 32-bit values, use the InterlockedDecrement function.

Requirements

See Also:

• InterlockedDecrement
• InterlockedDecrement16