InterlockedIncrement function

Increments (increases by one) the value of the specified 32-bit variable as an atomic operation.

To operate on 64-bit values, use the InterlockedIncrement64 function.

Syntax

unsigned InterlockedIncrement(
  _Interlocked_operand_ unsigned *Addend
);

Parameters

Addend

A pointer to the variable to be incremented.

Return Value

The function returns the resulting incremented value.

Remarks

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 _InterlockedIncrement.

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 InterlockedIncrementAcquire or InterlockedIncrementRelease instead.

Note  This function is supported on Windows RT-based systems.
 

Requirements

   
Windows version Windows XP [desktop apps | UWP apps] Windows Server 2003 [desktop apps | UWP apps]
Target Platform Windows
Header winbase.h (include Windows.h)
Library Kernel32.lib
DLL Kernel32.dll

See Also

Interlocked Variable Access

InterlockedDecrement

InterlockedIncrement16

InterlockedIncrement16Acquire

InterlockedIncrement16NoFence

InterlockedIncrement16Release

InterlockedIncrement64

InterlockedIncrementAcquire

InterlockedIncrementAcquire64

InterlockedIncrementNoFence

InterlockedIncrementNoFence64

InterlockedIncrementRelease

InterlockedIncrementRelease64

Synchronization Functions