InterlockedDecrementAcquire64 function
Decrements (decreases by one) the value of the specified 64-bit variable as an atomic operation. The operation is performed with acquire memory ordering semantics.
Syntax
LONGLONG __cdecl InterlockedDecrementAcquire64(
_Inout_ LONGLONG volatile *Addend
);
Parameters
- Addend [in, out]
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 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 _InterlockedDecrement64_acq.
Note This function is supported on Windows RT-based systems.
Requirements
Header |
Winnt.h (include Windows.h) |