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NF:winnt.InterlockedDecrement64 |
InterlockedDecrement64 function (winnt.h) |
Decrements (decreases by one) the value of the specified 64-bit variable as an atomic operation. |
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base\interlockeddecrement64.htm |
backup |
073b42ba-90dd-48a1-9661-9b1686c09561 |
12/05/2018 |
InterlockedDecrement64, InterlockedDecrement64 function, base.interlockeddecrement64, winnt/InterlockedDecrement64 |
winnt.h |
Windows.h |
Windows |
Windows Vista [desktop apps \| UWP apps] |
Windows Server 2003 [desktop apps \| UWP apps] |
Windows |
19H1 |
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Decrements (decreases by one) the value of the specified 64-bit variable as an atomic operation.
To operate on 32-bit values, use the InterlockedDecrement function.
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 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.
This function generates a full memory barrier (or fence) to ensure that memory operations are completed in order.
Itanium-based systems: For performance-critical applications, use InterlockedDecrementAcquire64 or InterlockedDecrementRelease64 instead.