InterlockedDecrement64

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

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

Syntax

LONGLONG InterlockedDecrement64(
    [in, out]    LONGLONG volatile *Addend
);

Parameters

[in, out] Addend

A pointer to the variable to be decreased.

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 on multiprocessor x86 systems and any non-x86 systems.

The interlocked functions provide a simple mechanism for synchronizing access to a variable shared by multiple threads. This function is atomic concerning 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 properly.

Requirements

See Also:

• InterlockedDecrement
• InterlockedDecrement16