Qt-interest Archive, December 2006
unloading plugins with QPluginLoader
Message 1 in thread
Two questions:
1) To unload a plugin that you loaded with QPluginLoader, do you have
to use the original QPluginLoader object, or can you just create a new
one with the same path and call unload()?
2) What platforms support plugin unloading? I've created a bunch of
graphical modules using qt plugins, and would like to unload them when
not needed to free up the large amount of memory they use.
Thanks
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Message 2 in thread
Hi,
> 1) To unload a plugin that you loaded with QPluginLoader, do you have
> to use the original QPluginLoader object, or can you just create a new
> one with the same path and call unload()?
From QPluginLoader::unload():
http://doc.trolltech.com/4.2/qpluginloader.html#unload
If other instances of QPluginLoader are using the same plugin,
the call will fail, and unloading will only happen when every
instance has called unload().
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Message 3 in thread
Hi,
> 2) What platforms support plugin unloading? I've created a bunch of
> graphical modules using qt plugins, and would like to unload them when
> not needed to free up the large amount of memory they use.
It is supported on all three platforms that Qt supports: Windows, X11, Mac.
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Message 4 in thread
ahh, ok. I thought I remembered seeing a line in some docs (at some
time) about unloading being dependent on the OS' ability to unload.
good to hear, thanks!
On 12/27/06, Dimitri <dimitri@xxxxxxxxxxxxx> wrote:
> Hi,
>
> > 2) What platforms support plugin unloading? I've created a bunch of
> > graphical modules using qt plugins, and would like to unload them when
> > not needed to free up the large amount of memory they use.
>
> It is supported on all three platforms that Qt supports: Windows, X11, Mac.
>
> --
> Dimitri
>
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Message 5 in thread
Hi,
> ahh, ok. I thought I remembered seeing a line in some docs (at some
> time) about unloading being dependent on the OS' ability to unload.
> good to hear, thanks!
Yes, I too remember something like that, but I can't find documentation
to support that. I seem to recall problems on older systems such as
HP-UX 10, which is not supported by Qt 4 anymore. As far as I know
unloading libraries works just fine in Qt 4.
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