🚀 go-pugleaf

"Robert G. Hoover" <not.a.real.address@anywhere.sorry> wrote in message 
news:45f57403@newsgroups.borland.com...
> Hi,
>
> I've written a video streaming application in Borland C++ Builder 
> v5,6,2006 that
> is experiencing a drastic performance decline on the new Intel D 935 (dual 
> core)
> processor. My camera supplier recommended using the Micro$oft CSemaphore 
> classes
> which is impractical as I use Borland products exclusively to develop my 
> code.
> Is there a Borland equivalent? Can I use the CreateSemaphore(), 
> OpenSemaphore(),
> ReleaseSemaphore() to keep my video grab/display thread from hiccuping so 
> badly?
> For reference, I have appended my thread code which uses simple bool 
> variables.
> If I utilize this Sleep() command at the bottom of the loop, performance 
> is
> improved, though not like it was on older machines. My 4-year-old laptop 
> is
> outperforming my tricked-out desktop!!! Any advice is welcome!
>
> Thanks so much!
>
> Rob
>
> _________________________________________________________________________________
>
>        // grab, process, display live video as normal
>        while (!terminated)
>        {
>            // give primary thread time to process frozen image
>            if (frozen)
>                Sleep(100);
>
>            // grab, process, and display video data
>            else
>            {
>                // set semiphore
>                busy = true;
>
>                // grab video frame(s) from camera
>                Grab(live_grabbing_count);
>
>                // process image data
>                Process();
>
>                // display current image on screen
>                Display();
>
>                // clear semiphore
>                busy = false;
>
>                // preserve process time
> //              Sleep(FrameRateTimeOut);
>            }
>        }

First, your code doesn't really give enough information to go on -- it 
doesn't show where the 'busy' flag is being tested, and doesn't provide any 
context to make sense of the problem you are having.  You should probably 
post a more complete example.

Second, if a Semaphore is needed, you can of course use the Win32 Semaphore 
functions (CSemaphore is merely a wrapper around those functions), or you 
can write your own semaphore class/wrapper.

Third, do you really need a semaphore?  Semaphores are typically used for 
resource counting.  If you just need to synchronize access to data, a 
critical section is simpler and faster.

- Dennis