InterlockedIncrement function (Windows)

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InterlockedIncrement function

Applies to: desktop apps | Metro style apps

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

LONG __cdecl InterlockedIncrement(
  __inout  LONG volatile *Addend
);

Parameters

Addend [in, out]: 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.

Requirements

Minimum supported client	Windows XP
Minimum supported server	Windows Server 2003
Header	WinBase.h (include Windows.h)
Library	Kernel32.lib
DLL	Kernel32.dll

Hi
I would like to know how to limit the usage of a dll file by n number of different processes.

For Example.
I have a dll file say MyApp.dll. Currently i have an application xyz.exe using it. Lets say i have another application abc.exe plans to use it. I need to get notification or i may need to increment a counter so that when more than "n" processes attempts to use this dll at the same time, i need to block it.

Each time a process access the dll i can increment a value in a file and decrement it when the application releases the dll. This is a workaround and is not at all appreciated. Can anybody give me a hint as to how to implement this for a Windows Mobile application?

Thanks in advance.

Arun.

[tfl - 25 08 09] Hi - and thanks for your post. You should post questions like this to the MSDN Forums at http://forums.microsoft.com/msdn or the MSDN Newsgroups at

http://www.microsoft.com/communities/newsgroups/en-us/ . You are much more likely get a quicker response using the forums than through the Community Content. For specific help about:
Visual Studio : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.vstudio%2C &
SQL Server : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.sqlserver%2C &
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PowerShell : http://groups.google.com/group/microsoft.public.windows.powershell/topics?pli=1
All Public : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public%2C &