InterlockedExchangeSubtract function (winbase.h)

Performs an atomic subtraction of two values.

Syntax

unsigned InterlockedExchangeSubtract(
  [in, out] unsigned volatile *Addend,
  [in]      unsigned          Value
);

[in, out] Addend

A pointer to a variable. The value of this variable is replaced with the result of the operation.

[in] Value

The value to be subtracted from the variable pointed to by the Addend parameter.

The function returns the initial value of the Addend parameter.

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

Requirement	Value
Minimum supported client	Windows 7 [desktop apps \| UWP apps]
Minimum supported server	Windows Server 2008 R2 [desktop apps \| UWP apps]
Target Platform	Windows
Header	winbase.h (include Windows.h)