[linrad] Re: Memory leakage.

[Richard Hosking <iinet.net.au; richardh@xxxxxxxxxxxxxxxx>]

Leif

I cant speak as an accomplished programmer, having only done simple 
projects in C++
Still the code seems to be part of a routine. It looks like

cross_cursor is an object of class XCreateFontCursor

Maybe this is not being destroyed after use?

I havent the faintest how you would find the class code for this
X11 on my machine appears to be all C, though I cant locate source - I have just loaded Mandrake from a CD 

No doubt there are more accomplished programmers who could advise..

Richard


Leif Asbrink wrote:

> Hello Richard,
>
>  
>
> > Lost memory is allocated when an object in C++ is created , but not 
> > released when the object is destroyed. This is usually performed by the 
> > destructor for the class if the class has been written properly.
> >    
> ???????????????
> I have seen similar text before, but it does not tell me anything
> at all. I have for example this problem. Only four simple statements:
>
> xdis = XOpenDisplay(":0");
> cross_cursor = XCreateFontCursor(xdis, XC_diamond_cross);
> XFreeCursor(xdis, cross_cursor);
> XCloseDisplay(xdis);
> return 0;
>
> If I comment out the second and the third statement all is ok,
> but with both of them in place I get this report from valgrind:
> ==9031== LEAK SUMMARY:
> ==9031==    definitely lost: 8 bytes in 1 blocks.
> ==9031==    indirectly lost: 104 bytes in 4 blocks.
>
>  
>
> > This results in increasing useless RAM utilization and eventually disk 
> > swapping, slowing everything down.
> >    
> How can I detect whether it happened? 
>
>  
>
> > (hope I am not telling you things you already know.. :)  )
> >    
> You told things I kind of heard about but that I do not
> understand how to deal with. Did I make a mistake in the
> example above or is X11 not quite ok yet? Do you know?
> Using pthreads is much worse..............
>
> 73
>
> Leif
>
>
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