Extra, unaccounted for threads using WinApi with OpenGL.

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I have a problem in my program where 2 extra threads get created from a block of code that uses the winapi. I saw nothing in the documentation of the functions used that indicates that the threads would be created. But if I don't run this block my program has 1 thread and if I do then it has 3. This is the code block:

C++

if (!(hdc = GetDC(hwd))                           ||
    !(PixelFormat = ChoosePixelFormat(hdc, &pfd)) ||
    !(SetPixelFormat(hdc,PixelFormat, &pfd))      ||
    !(hrc = wglCreateContext(hdc)))
{
    DestructWindow();
    return false;
}

Is there any way to get rid of those 2 extra threads or are they supposed to be there?

Posted 17-Sep-11 11:37am

James_722

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Philippe Mori 17-Sep-11 18:16pm

If you don't create them, then don't get rid of them and don't worry too much about that.

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**`Randor`** · Accepted Answer · 2011-09-17T12:04:00

James,

The Microsoft GDI+ library gdiplus.dll will spawn worker threads within your process. I don't think there is any documented way to control this. You can probably verify this by downloading Process Explorer[^] and right-clicking your process and selecting the 'Threads' tab. If you have Debugging Tools for Windows[^] installed and your symbols properly setup you will even be able to inspect the call stack.

Best Wishes,
-David Delaune