Decrements (decreases by one) the value of the specified 32-bit variable as an atomic operation. The operation is performed with acquire memory ordering semantics.
LONG __cdecl InterlockedDecrementAcquire( _Inout_ LONG volatile *Addend );
- Addend [in, out]
A pointer to the variable to be decremented.
The function returns the resulting decremented value.
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_acq.
Note This function is supported on Windows RT-based systems.
For processors that do not support acquire memory ordering semantics, this function is defined as a call to the InterlockedDecrement function. For more information, see WinBase.h.
Minimum supported client
Windows Vista [desktop apps | UWP apps]
Minimum supported server
Windows Server 2003 [desktop apps | UWP apps]
|WinBase.h (include Windows.h)|