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The Cairo operating systemThe Cairo operating systemPosted Jul 7, 2006 10:46 UTC (Fri) by evgeny (guest, #774)In reply to: The Cairo operating system by oak Parent article: Cairo release 1.2.0 now available
Why the hell do you need to unregister a backend (except for atexit time)? I know of no plugin-enabled app (Gimp/Firefox/...) that allow for run-time plugin unloading. Even in the kernel support for rmmod is a non-default option.
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The Cairo operating system Posted Jul 7, 2006 19:38 UTC (Fri) by oak (guest, #2786) [Link] If you need to change the backend. For example when you migrate yourapplication window from local display (with OpenGL support) to a remote display. Gtk has already some support for display migration. For something like in-process panel applets dlclose() & dlopen() make sense. User might very well want to change the panel applets at run-time...
The Cairo operating system Posted Jul 7, 2006 20:01 UTC (Fri) by evgeny (guest, #774) [Link] Fine, but this still doesn't explain why you insist on closing the first _backend_? What you describe is switching from an _instance_ of a device to an instance of another device. Say, the X11 device, once registered, could allow you to have several Drawables (Pixmap/Window) in the same app - e.g., one for the main window, another one for File/Open... preview, etc, which doesn't mean the X11 device plugin should be registered/unregistered each time. Just as the dynamic loader does symbol resolving only once, similarly, all available/enabled backend plugins need to be initiated only once.
The Cairo operating system Posted Jul 7, 2006 20:24 UTC (Fri) by oak (guest, #2786) [Link] > Fine, but this still doesn't explain why you insist on closing> the first _backend_? I did not say any such thing. :-) I was merely commenting on the pros&cons of dlopen() and dlclose(). Whether some piece of code actually uses them, is up to the code... > Say, the X11 device, once registered, could allow you to have several > Drawables (Pixmap/Window) in the same app - e.g., one for the main > window, another one for File/Open... Note that those are different windows. (X) display migration means moving all of applications (open) windows from one (e.g. local) X server to another X server. For example you take a PDA with you to a meeting and you want to show something you've scribbled with it briefly on the projector before continuing using the same program. Or you have in your desktop machine multiple graphics cards each running a separate X server and you want to migrate some of your apps from one X server to another *without closing* the apps.
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