Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results


Before Posting...

Please check out the Community Guidelines in the Announcements and Administration Category.

More Info on Driver Writing and Debugging

The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.

Check out The OSR Learning Library at:

InterlockedIncrement64 Available?

alec_leealec_lee Member Posts: 50
edited June 2022 in NTDEV

In wdm.h, i've found these:

   #define InterlockedIncrement64 _InterlockedIncrement64
   InterlockedIncrement64 (
       _Inout_ _Interlocked_operand_ LONG64 volatile *Addend

But after some search "InterlockedIncrement" ( is the only one documented which takes a LONG argument:

  LONG CDECL_NON_WVMPURE InterlockedIncrement(
    [in, out] LONG volatile *Addend

So what is the proper way to increment a 64bit argument ? Should we just call InterlockedIncrement64 directly?


  • Peter_Viscarola_(OSR)Peter_Viscarola_(OSR) Administrator Posts: 9,107

    That’s what I would do. I’d also file a bug on the docs, indicating the 64-bit variant is undocumented. I’m sure the doc writers will appreciate this, and if there happens to be some strange reason the decision to not doc the function is intentional, they’ll telll you.


    Peter Viscarola

  • MBond2MBond2 Member Posts: 599

    note also that modern compilers implement these as intrinsics and emit the lock instructions directly. That may be why they aren't in this part of the documentation

Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. Sign in or register to get started.

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Kernel Debugging 16-20 October 2023 Live, Online
Developing Minifilters 13-17 November 2023 Live, Online
Internals & Software Drivers 4-8 Dec 2023 Live, Online
Writing WDF Drivers 10-14 July 2023 Live, Online