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Editorial Team
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Asked: 2026-06-09T18:55:12+00:00

There is requirement of writing a Qt application on a MIPS based platform. But

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There is requirement of writing a Qt application on a MIPS based platform.

But there are lots of constraints. The constraints included freeing up of few resources (QGFX Plugin, GPU Memory etc) when required and re-using it. But the application cannot be killed as its handling lots of other requests and running other things.

Basically the GUI needs to be killed and free all the resources related to GUI; later when when required restart again

One of the way which has been tried is :

main() -> create a New-Thread

In the New-Thread,

while(<Condition>)
{
  sem_wait(..)
  m_wnd =  new myMainWindow();
   ...
   ..
   app->exec();
}

When ever there is a kill command, it comes out of the event loop, and wait for the signal from other threads. Once other threads does the required changes, it will get the signal and will create a new window and goes into the event loop.

In the main(), there are also few other threads created, which control other devices etc and signal the start and stop for the Qt-GUI.

The above seems to work but I am not sure if this is the right design. Does it create any problem?

Can any one suggest any better way?

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1 Answer

  1. Editorial Team

    I was able to find the required answer in Qt-Forums.

    Since the main intention was to remove all the things related to GUI (On screen), I could use void setQuitOnLastWindowClosed ( bool quit ) (Details Here). This will make sure the GUI / Main window is closed and still the app doesnt come out of event loop and I can restart the main window later.

    Thanks

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