[Development] Backporting the "stop unloading plugins" change to 5.6

[Konstantin Tokarev]

13.10.2016, 20:39, "André Pönitz" <apoenitz at t-online.de>:
> On Thu, Oct 13, 2016 at 08:01:57PM +0300, Konstantin Tokarev wrote:
>>  > I still consider the approach of not unloading plugins fundamentally
>>  > wrong. It only deepens the trench between Qt and valid approaches at
>>  > software architectures.
>>
>>  I think not unloading plugins is fundamentally right thing to do, if
>>  user does not request unload explicitly.
>
> What should happen *if* the user requests unloading explictly?

I think it should be unloaded completely if platform supports that.

>
> Andre'
>
> PS:
>
>>  * It's not supported on all platforms (e.g., uclibc and musl implement
>>  dlclose() as a stub).
>
> Qt was never about providing common subsets of all supported platforms.
>
>>  * At application exit OS will unload plugins and clean up related
>>  resources much faster than it could be implemented with unload in
>>  destructors.
>
> I am not concerned about toy applications that gets started and closed
> by the minute.

* Do your applications load different plugins every minute? In many cases same
plugins are needed for the whole lifetime of application.

* In case of very large applications shutdown time is important as well,
as it can become annoyingly large.

-- 
Regards,
Konstantin