On Aug 3, 2012, at 3:39 AM, [email protected] wrote:
> Hello all,
>
> I have a Timer Event handler in UEFI based GUI application. When timer event
> is signaled, event handler is called. But control is not coming back to
> normal application flow once handler function is over. It is getting hung in
> the event handler end. TPL for Event handler is set to TPL_CALLBACK and for
> application it is TPL_APPLICATION.
>
> What could be the issue here?
1) Bad code in the event handler that is hanging or corrupting some other code
that hangs.
2) It is theoretically possible that the timer events are so slow that you
spend all your time in the event handlers and never make it back into the main
code.
There is only one main thread in EFI (the application) and no way to change
that. The event callbacks are called in groups based on TPL (higher TPL first),
as long as the TPL is higher than the restored TPL.
The dispatch of events happens as a result of calls to gBS->RestoreTpl(),
CoreRestoreTpl() in the edk2 DXE Core
https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/MdeModulePkg/Core/Dxe/Event/Tpl.c
>
> Regards,
> Himdeep
>
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