InterlockedDecrement

InterlockedDecrement decrements (decreases by one) the value of the specified 64-bit variable as an atomic operation.

Syntax

LONG InterlockedDecrement(
    [in, out]    LONG 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 x64 systems and any non-x64 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. It is thread-safe.

This function is implemented using a compiler intrinsic where possible. This function generates a full memory barrier (or fence) to ensure that memory operations are completed properly.

Requirements

See Also:

• InterlockedDecrement16
• InterlockedDecrement64