InterlockedIncrement64 function (winnt.h)

Increments (increases by one) the value of the specified 64-bit variable as an atomic operation.

To operate on 32-bit values, use the InterlockedIncrement function.

LONG64 InterlockedIncrement64(
  [in, out] LONG64 volatile *Addend
);

[in, out] Addend

A pointer to the variable to be incremented.

The function returns the resulting incremented 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 _InterlockedIncrement64.

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 InterlockedIncrementAcquire64 or InterlockedIncrementRelease64 instead.

Interlocked Variable Access

InterlockedDecrement

InterlockedIncrement

InterlockedIncrement16

InterlockedIncrement16Acquire

InterlockedIncrement16NoFence

InterlockedIncrement16Release

InterlockedIncrementAcquire

InterlockedIncrementAcquire64

InterlockedIncrementNoFence

InterlockedIncrementNoFence64

InterlockedIncrementRelease

InterlockedIncrementRelease64

Synchronization Functions